THEIC TRIS HYDROXYETHYL ISOCYANURATE

WHAT IS THEIC TRISHYDROXYETHYL ISOCYANURATE?
THEIC is an organic isocyanurate compound in which an isocyanurate ring carries three 2-hydroxyethyl substituents. The systematic chemical description is 1,3,5-Tris(2-hydroxyethyl)-1,3,5-triazine-2,4,6-trione, while Tris(2-Hydroxyethyl) Isocyanurate and THEIC are widely used practical names.

The central isocyanurate structure contains a six-membered heterocyclic ring with alternating nitrogen and carbon atoms and three carbonyl groups. Each nitrogen atom is substituted with a 2-hydroxyethyl group, resulting in three terminal hydroxyl groups that provide reactive functionality for polymer chemistry.

Because THEIC contains three hydroxyl groups in one molecule, it can behave as a multifunctional polyol or reactive component in suitable resin systems. This functionality is one of the principal reasons Tris(2-Hydroxyethyl) Isocyanurate is used in polyester, polyurethane and other thermosetting or crosslinkable material systems.

THEIC should not be confused with cyanuric acid itself, ordinary isocyanuric acid, triethylene glycol, or other multifunctional polyols. Although these materials can appear in related polymer chemistry discussions, their molecular structures and reactivity profiles are different.

The term Tris(2-Hydroxyethyl) Isocyanurate describes the actual chemical structure, while THEIC is the widely used abbreviation. Tris(hydroxyethyl) Isocyanurate is another common abbreviated chemical name and is often encountered in supplier catalogues and technical databases.

Common Product and Chemical Names:
THEIC

Tris(2-Hydroxyethyl) Isocyanurate

Tris(2-hydroxyethyl)isocyanurate

Tris(hydroxyethyl) Isocyanurate

1,3,5-Tris(2-hydroxyethyl)isocyanurate

1,3,5-Tris(2-hydroxyethyl)-1,3,5-triazine-2,4,6-trione

N,N',N''-Tris(2-hydroxyethyl)isocyanurate

Tris(2-hydroxyethyl)-1,3,5-triazinetrione

Tris(beta-hydroxyethyl)isocyanurate

Tris(2-hydroxyethyl)cyanuric acid

1,3,5-Tris(2-hydroxyethyl)cyanuric acid

Isocyanuric Acid Tris(2-hydroxyethyl) Ester

Tris(2-hydroxyethyl)-s-triazine-2,4,6-trione

THEIC compound

THEIC chemical

THEIC powder

THEIC granular

THEIC resin intermediate

THEIC polymer additive

THEIC crosslinking component

THEIC heat stabilizer

THEIC PVC stabilizer

THEIC wire enamel additive

THEIC polyester modifier

THEIC polyurethane component

THEIC isocyanurate

Tris(2-Hydroxyethyl) Isocyanurate powder

Tris(2-Hydroxyethyl) Isocyanurate granular

Some of these names are exact or near-equivalent chemical names, while others describe a product form, commercial application or technical function. THEIC, Tris(2-Hydroxyethyl) Isocyanurate and 1,3,5-Tris(2-hydroxyethyl)isocyanurate refer to the same chemical identity when they are used for CAS 839-90-7, whereas terms such as THEIC powder, THEIC granular and THEIC PVC stabilizer describe the material or its intended use rather than creating a different chemical substance.

Searches for this material can also appear under terms such as THEIC CAS 839-90-7, THEIC EINECS 212-660-9, Tris(2-Hydroxyethyl) Isocyanurate supplier, Tris(2-Hydroxyethyl) Isocyanurate manufacturer, THEIC powder, THEIC for wire enamel, THEIC for PVC stabilizers, THEIC polyester, THEIC polyurethane, THEIC crosslinking agent and Tris(hydroxyethyl) Isocyanurate. These search terms represent different stages of technical purchasing and formulation research.

CAS NO, EC / EINECS NO AND CHEMICAL IDENTITY OF THEIC
Product name: THEIC

Common chemical name: Tris(2-Hydroxyethyl) Isocyanurate

Chemical name: 1,3,5-Tris(2-hydroxyethyl)-1,3,5-triazine-2,4,6-trione

CAS No: 839-90-7

EC / EINECS No: 212-660-9

Molecular formula: C9H15N3O6

Molecular weight: 261.23 g/mol

PubChem CID: 13286

MDL Number: MFCD00003549

Chemical class: Hydroxy-functional isocyanurate / triazine derivative

Physical form: White powder or crystalline solid

Main reactive functionality: Three hydroxyl groups

Heterocyclic core: Isocyanurate ring

Main application areas: Wire enamels, coatings, polyester resins, polyurethane systems, PVC stabilization, polymer modification and specialty chemical synthesis. THEIC is registered under CAS No. 839-90-7 and EC No. 212-660-9. PubChem identifies the compound as 1,3,5-Tris(2-hydroxyethyl) Isocyanurate and reports the molecular formula C9H15N3O6 with a molecular weight of 261.23 g/mol.

The EC number 212-660-9 is also associated with Tris(2-hydroxyethyl) Isocyanurate in chemical databases and supplier documentation. The term EINECS is still commonly used in commercial searches, although EC Number is the more appropriate current terminology for European chemical identification.

The CAS number should be checked against the supplier's current SDS, TDS and COA when purchasing THEIC. This is particularly important where different grades, particle sizes, purity specifications or application-specific products are being compared.

CHEMICAL STRUCTURE AND MOLECULAR PROPERTIES OF THEIC TRIS(2-HYDROXYETHYL) ISOCYANURATE
THEIC contains a 1,3,5-triazine-2,4,6-trione ring, commonly referred to as an isocyanurate ring. The ring contains three nitrogen atoms and three carbonyl-containing carbon atoms, giving the molecule a rigid heterocyclic core with substantial polar character.

Each nitrogen atom of the isocyanurate ring is substituted with a 2-hydroxyethyl group. Consequently, one THEIC molecule contains three terminal hydroxyl groups, which are the most important reactive sites when the compound is incorporated into polymer and crosslinking chemistry.

The molecular architecture can be represented conceptually as an isocyanurate core carrying three hydroxyethyl arms. This arrangement creates a multifunctional molecule rather than a simple monofunctional alcohol.

The three hydroxyl groups are important because they can participate in reactions with functional groups such as isocyanates, carboxylic acids, anhydrides and other reactive groups under appropriate formulation and curing conditions. The exact reaction pathway depends on the resin chemistry, catalyst, temperature and processing conditions.

The isocyanurate ring contributes structural rigidity and thermal characteristics, while the hydroxyethyl groups provide chemical reactivity. The combination of these two structural features makes THEIC different from simple aliphatic diols and triols.

Molecular formula: C9H15N3O6

Molecular weight: 261.23 g/mol

Number of nitrogen atoms: 3

Number of oxygen atoms: 6

Number of hydroxyl groups: 3

Number of carbonyl groups: 3

Heterocyclic ring: 1,3,5-Triazine-2,4,6-trione / isocyanurate

Functional group: Hydroxyl

Functional group count: Three hydroxyl groups per molecule

The three hydroxyl groups give THEIC a trifunctional character in many polymer reactions. When reacted with multifunctional partners, this can contribute to branching or network formation, depending on stoichiometry and the chemistry of the formulation.

This functionality explains why Tris(2-Hydroxyethyl) Isocyanurate is particularly relevant to thermosetting resin systems and high-performance coatings. It can become part of the polymer network rather than functioning solely as an inert filler or physical additive.

The rigid heterocyclic structure can also contribute to the thermal and mechanical behavior of polymers in which THEIC is chemically incorporated. However, the final properties belong to the complete resin system rather than to THEIC alone, so performance should always be evaluated at the formulation level.

PHYSICAL AND CHEMICAL PROPERTIES OF THEIC TRIS(2-HYDROXYETHYL) ISOCYANURATE
THEIC is generally supplied as a white powder or crystalline solid. PubChem describes 1,3,5-Tris(2-hydroxyethyl) Isocyanurate as a white powder, while commercial suppliers may offer the material in powder or granular forms depending on production and packaging.

General technical properties:

Appearance: White powder or crystalline solid

Molecular formula: C9H15N3O6

Molecular weight: 261.23 g/mol

CAS No: 839-90-7

EC / EINECS No: 212-660-9

MDL No: MFCD00003549

Chemical class: Hydroxy-functional isocyanurate

Odor: Typically low odor or practically odorless solid, subject to product specification

Functional groups: Three hydroxyl groups and three carbonyl groups

Water solubility: Solubility depends on temperature and test conditions, and the supplier's current specification should be used for formulation work

Solubility in chloroform: Insoluble according to TCI product information

Solubility in benzene: Insoluble according to TCI product information

Physical form: Powder or crystalline solid

Typical color: White

Thermal behavior: Thermally stable enough for applications involving elevated processing temperatures, with exact behavior dependent on formulation and test conditions

Purity: Grade dependent

Particle size: Grade dependent

Bulk density: Grade dependent

Moisture: Grade dependent

Melting or decomposition behavior: Should be taken from the current supplier specification because reported values can depend on measurement method and material condition. THEIC is not a volatile liquid and is normally handled as a solid chemical raw material. Its low volatility is useful in many polymer and coating manufacturing processes, although dust control and appropriate industrial hygiene remain important during powder handling.

The physical properties of commercial THEIC should not be interpreted as universal values for every grade. Particle size, bulk density, residual moisture, purity and granulation can differ between suppliers and production batches. The material's molecular weight of approximately 261.23 g/mol is a fixed molecular property for the defined compound, whereas properties such as particle size, bulk density and appearance can vary with commercial processing.

HOW DOES THEIC WORK AT THE MOLECULAR LEVEL?
The most important molecular feature of THEIC is the combination of a rigid isocyanurate ring and three hydroxyethyl groups. The isocyanurate ring provides the structural core, while the terminal hydroxyl groups provide reaction sites for polymer synthesis and crosslinking.

When THEIC is incorporated into a resin system containing suitable reactive groups, its hydroxyl groups can participate in chemical reactions. In polyurethane chemistry, for example, hydroxyl groups can react with isocyanate groups under appropriate conditions, allowing THEIC to become incorporated into a polyurethane network.

In polyester chemistry, the hydroxyl functionality can participate in esterification or related condensation chemistry with suitable acid or anhydride components. The resulting resin architecture depends on the complete formulation and processing conditions.

Because there are three hydroxyl groups on one molecule, THEIC can contribute to branching and crosslinking rather than behaving simply as a linear chain extender. The extent of this effect depends strongly on equivalent ratios, resin functionality, catalyst level and curing conditions.

The isocyanurate ring itself is relatively rigid compared with flexible aliphatic segments. When incorporated into a polymer network, this structural element can contribute to thermal and mechanical characteristics of the final material.

The molecular role of THEIC can therefore be summarized as a multifunctional reactive building block rather than simply a passive additive. This distinction is important when comparing THEIC with conventional plasticizers, fillers or monofunctional modifiers.

THEIC AND POLYMER REACTIVITY
The three hydroxyl groups of Tris(2-Hydroxyethyl) Isocyanurate make the compound particularly useful where a multifunctional hydroxyl component is required. Its functionality can be exploited to introduce a rigid isocyanurate structure into a polymer network.

In polyurethane systems, THEIC can function as a multifunctional hydroxyl-containing component. Its three hydroxyl groups can react with suitable isocyanate functionality, and the resulting network structure can differ substantially from that obtained with a simple diol.

In polyester systems, THEIC can be used as part of the polyol component or as a reactive modifier. Historical patent literature describes THEIC-containing polyester systems for wire enamels and related electrical insulation applications. This is one reason THEIC has remained relevant in electrical insulation chemistry. The molecule can contribute both reactive hydroxyl functionality and an isocyanurate-based structural element within the cured resin.

THEIC IN WIRE ENAMELS
One of the best-established technical applications of THEIC is the manufacture of heat-resistant wire enamels. In these systems, THEIC is incorporated into resin chemistry used to coat electrically conductive metal wire. Wire enamel is not simply a decorative coating. It is an electrical insulation layer that must provide a combination of dielectric performance, adhesion, thermal endurance, mechanical durability and processability.

THEIC-containing polyester systems have been investigated and used for electrical wire coatings where the resin must tolerate elevated temperatures and repeated thermal exposure. Patent literature specifically describes THEIC-containing polyester wire enamels and processes for coating metal wires.

The role of THEIC in wire enamel chemistry is therefore connected to polymer architecture rather than merely to physical blending. Its hydroxyl groups can become part of the resin chemistry, while the isocyanurate structure contributes to the properties of the resulting polymer system.

THEIC can be especially valuable where a manufacturer is trying to balance thermal resistance with adhesion, hardness, flexibility and coating-process requirements. The exact optimum depends on the resin platform and the wire-coating process.

In practical production, parameters such as resin viscosity, solids content, curing temperature, line speed, catalyst system, solvent balance and coating thickness can influence final wire-enamel performance. THEIC should therefore be evaluated as part of the complete resin formulation rather than as an isolated performance ingredient.

THEIC FOR ELECTRICAL INSULATION MATERIALS
Electrical insulation is a technically demanding application because the material must maintain its electrical properties under thermal, mechanical and environmental stress. THEIC can contribute to resin systems used for insulating varnishes and wire enamels where multifunctional hydroxyl chemistry is required. THEIC-modified polyester systems are particularly associated with electrical insulation coatings. Historical patent literature describes THEIC polyester wire enamels and their use in electrical wire coating systems.

The presence of the isocyanurate ring can be advantageous when designing polymer systems that require a combination of structural rigidity and thermal performance. However, dielectric performance is a property of the complete cured insulation system and cannot be assigned to THEIC alone. For technical buyers, this means that a THEIC specification should be considered together with the resin system, purity, moisture, particle size and processing requirements.

THEIC IN POLYESTER RESINS
THEIC is used as a multifunctional hydroxyl component in selected polyester resin systems. Its three hydroxyl groups allow it to participate in condensation reactions with carboxyl-functional materials under suitable synthesis conditions.

The incorporation of THEIC can change resin branching, molecular architecture, viscosity development and crosslink density. These changes can influence hardness, thermal resistance, adhesion and chemical resistance of the cured coating. 

In high-performance coating development, THEIC can therefore be selected when the formulator needs more than simple chain extension. The trifunctional structure can provide a route toward a more highly connected polymer architecture.

The correct THEIC level is formulation dependent. Excessive multifunctional content can increase branching or crosslink density to a point where viscosity, flexibility or processability becomes undesirable. For this reason, THEIC should be evaluated using equivalent-based formulation calculations rather than simply replacing another polyol on a weight-for-weight basis.

THEIC IN POLYURETHANE SYSTEMS
THEIC can participate in polyurethane chemistry because it contains three hydroxyl groups. These hydroxyl groups can react with isocyanate-functional components under suitable catalytic and thermal conditions.

This makes Tris(2-Hydroxyethyl) Isocyanurate useful as a multifunctional reactive component in selected polyurethane systems. Its incorporation can contribute to a more highly crosslinked polymer architecture than a simple monofunctional alcohol.

Historical patent literature specifically describes the use of N,N',N''-Tris(2-hydroxyethyl)isocyanurate in polyurethane-based wire lacquer systems. The disclosed chemistry uses THEIC as part of an isocyanate-reactive component.

In practical polyurethane formulation, the hydroxyl equivalent of THEIC must be considered carefully. The stoichiometric relationship between hydroxyl groups and isocyanate groups strongly affects the final network structure.

A formulation containing too much multifunctional hydroxyl material can become excessively crosslinked, while insufficient functionality may not deliver the intended network properties. Catalyst selection and curing temperature also influence reaction kinetics.

THEIC AS A CROSSLINKING COMPONENT
THEIC is often described as a crosslinking component or crosslinking-related additive because its three hydroxyl groups can participate in network-forming reactions. This terminology should be understood in the context of the specific resin chemistry.

A molecule with three reactive hydroxyl groups can connect multiple polymer chains when reacted with a suitable multifunctional partner. This is fundamentally different from a monofunctional alcohol, which generally terminates or caps a growing chain rather than creating the same degree of connectivity.

THEIC can therefore be useful in formulations where increased network density is required. Potential effects include increased hardness, improved thermal resistance and changes in chemical resistance, depending on the polymer system.

However, higher crosslink density is not automatically better. Excessive network density can reduce flexibility, increase brittleness or complicate processing. THEIC selection should therefore be driven by the required balance of properties.

THEIC FOR PVC STABILIZER SYSTEMS
Another important application area for THEIC is PVC stabilization. Supplier literature describes THEIC as a component used in PVC heat stabilizer systems and in the modification of PVC processing behavior. PVC processing involves elevated temperatures at which thermal degradation can become an important concern. Stabilizer systems are designed to reduce undesirable degradation and maintain the required processing and end-use properties.

THEIC can be used in selected stabilizer formulations as part of a broader stabilizer package. Its role should not be interpreted as meaning that THEIC alone provides complete PVC stabilization. The actual performance of a PVC stabilizer package depends on the polymer grade, processing temperature, residence time, stabilizer chemistry, lubricant package, pigment system and other additives. For technical buyers, the relevant question is therefore not simply whether THEIC is a PVC stabilizer, but whether the specific THEIC grade is suitable for the intended stabilizer formulation and processing conditions.

THEIC IN COATINGS
THEIC has a long history in coating chemistry, particularly in heat-resistant and electrically insulating coatings. Its hydroxyl functionality allows it to participate in binder reactions, while the isocyanurate core can become part of the resulting polymer structure.

Coating systems containing THEIC can be designed for applications where thermal resistance, hardness, adhesion and chemical durability are important. Wire enamels are a particularly established example. THEIC may also be used in selected polyurethane and polyester coating systems. Supplier literature describes applications in water-based baking lacquer, unsaturated polyester resin and other coating-related systems.

The final coating performance depends on resin composition, curing mechanism, pigment and filler loading, solvent or water balance, catalyst selection and film thickness. THEIC should therefore be considered a reactive formulation component rather than a universal coating additive.

THEIC AND HEAT RESISTANCE
Heat resistance is one of the most important reasons THEIC is selected for specialized polymer systems. The isocyanurate ring provides a relatively rigid heterocyclic structure, while chemical incorporation into a polymer network can affect the thermal behavior of the cured material.

In wire-enamel applications, THEIC-containing polyester systems have been developed specifically for electrical insulation under demanding thermal conditions. The literature includes processes designed to improve the processing and performance of such coatings.

The phrase “heat resistant” should nevertheless be interpreted as a property of the finished polymer system rather than as a standalone property of THEIC. Thermal stability, thermal endurance and heat resistance are influenced by the complete formulation and curing history. For this reason, formulators should evaluate the final resin or coating using the appropriate thermal testing method rather than relying only on the presence of THEIC.

THEIC AND MECHANICAL PROPERTIES
When THEIC becomes incorporated into a polymer network, its multifunctional structure can influence hardness, modulus, flexibility and resistance to mechanical deformation. The direction and magnitude of the effect depend on the polymer chemistry.

Increasing THEIC content can increase network connectivity in systems where its hydroxyl groups participate in crosslinking. This may improve hardness or thermal resistance but can also reduce flexibility if the network becomes excessively rigid.

The most useful formulation approach is therefore to optimize THEIC concentration rather than maximize it. The desired balance depends on whether the final material is intended for rigid coatings, flexible electrical insulation, structural polymer systems or another application.

THEIC AND CHEMICAL RESISTANCE
Crosslinked polymer systems containing THEIC can show changes in resistance to solvents, chemicals and environmental exposure. This is generally related to changes in network structure and crosslink density rather than a simple direct “chemical resistance” effect from free THEIC.

A more tightly connected network can reduce the ability of certain liquids or chemicals to penetrate and swell the polymer. However, the exact result depends on the chemistry of the resin and the chemical environment. Testing should therefore be performed on the final cured formulation using the actual chemicals and exposure conditions relevant to the application.

THEIC AND PROCESSABILITY
One of the technically useful features of THEIC is that it can influence polymer processability as well as final properties. Historical wire-enamel patent literature specifically describes THEIC-containing systems in relation to improved processing characteristics.

Processability can include resin viscosity, coating behavior, curing response, line speed, film formation and surface quality. A formulation that has excellent final properties but cannot be processed consistently may not be commercially useful. THEIC can therefore be valuable where a manufacturer is optimizing both polymer performance and production efficiency. However, the effect depends strongly on resin architecture and the exact formulation.

THEIC IN UNSATURATED POLYESTER RESINS
THEIC is reported for use in unsaturated polyester-related resin systems. Its multifunctional hydroxyl chemistry can influence the structure and branching of the resin during synthesis. In such systems, THEIC may be selected to introduce a rigid multifunctional component. 

The resulting polymer architecture can be adjusted by changing the ratio of THEIC to other polyols and acid components. The correct balance is important because excessive branching may increase viscosity too strongly, whereas insufficient functionality may not provide the desired cured properties.

THEIC IN POLYURETHANE FLAME-RESISTANT SYSTEMS
THEIC has also been described in connection with polyurethane and flame-resistant polymer chemistry. Some commercial literature lists polyurethane plastics and flame-retardant-related applications among the uses of Tris(2-Hydroxyethyl) Isocyanurate.

The precise flame-retardant mechanism should not be oversimplified. THEIC is not equivalent to every conventional halogenated or phosphorus-based flame retardant, and its effect depends on how it is incorporated into the polymer and what other flame-retardant components are present. In some formulations, the value of THEIC is related more to its reactive multifunctional structure and contribution to polymer architecture than to acting as a conventional migrating flame-retardant additive.

THEIC FOR PVC AND PLASTIC APPLICATIONS
THEIC can be encountered in PVC and plastics applications where heat stabilization or polymer modification is required. The compound may be included as part of a stabilizer or additive package rather than as the primary polymer component.

Plastic processing conditions can expose PVC and other polymers to significant thermal stress. A properly designed additive system can help maintain processing stability and final material performance. THEIC should therefore be selected according to the complete additive package and the intended processing window. A supplier's application data and current technical documentation should be reviewed before commercial use.

THEIC AS A REACTIVE ORGANIC INTERMEDIATE
Beyond polymer applications, THEIC can function as an intermediate in organic and materials chemistry. Its three hydroxyl groups and stable heterocyclic core make it a useful building block for selected synthetic pathways.

Supplier literature describes THEIC as an intermediate for organic synthesis and as a component in the preparation of polymeric materials. The exact use of THEIC as an intermediate depends on the target molecule and reaction chemistry. It should not be assumed that all commercial THEIC grades are interchangeable with reagent-grade material for synthesis.

TECHNICAL ADVANTAGES OF THEIC
One important advantage of THEIC is multifunctionality. A single molecule provides three hydroxyl groups, allowing it to contribute to polymer network formation without requiring three separate monofunctional molecules.

Another advantage is the combination of hydroxyl reactivity with an isocyanurate ring. This provides a structural profile that differs from conventional flexible polyols. THEIC can also be useful where thermal performance and polymer rigidity are important. Its long-established use in wire-enamel chemistry demonstrates the practical value of this molecular architecture.

A further advantage is formulation flexibility. THEIC can be used in polyester chemistry, polyurethane chemistry and selected stabilizer or coating systems, although the exact function differs between applications.

THEIC COMPARED WITH SIMPLE POLYOLS
Simple diols such as ethylene glycol or propylene glycol provide two hydroxyl groups and relatively flexible molecular structures. THEIC provides three hydroxyl groups combined with a rigid heterocyclic core.
This means that replacing a conventional diol with THEIC is not a simple one-to-one substitution. The functionality, molecular geometry and resulting polymer architecture are different.
A technical formulator choosing THEIC is generally looking for multifunctionality and structural contribution rather than simply hydroxyl content.

THEIC COMPARED WITH TRIMETHYLOLPROPANE
Trimethylolpropane is another widely used trifunctional polyol. Both compounds can provide three hydroxyl groups, but their molecular structures are very different. Trimethylolpropane contains a flexible aliphatic carbon framework, whereas THEIC contains a rigid isocyanurate ring with three hydroxyethyl substituents. This difference can affect the glass transition behavior, network rigidity, thermal response, viscosity and final mechanical properties of the resulting polymer. The appropriate choice depends on the target formulation.

THEIC COMPARED WITH PENTAERYTHRITOL
Pentaerythritol is a tetrafunctional alcohol containing four hydroxyl groups, whereas THEIC contains three hydroxyl groups. Their structures and reaction behavior are therefore different. Pentaerythritol can generate high network functionality, while THEIC combines lower hydroxyl functionality with an isocyanurate ring. In applications where rigidity, thermal performance and isocyanurate-containing polymer architecture are important, THEIC may provide a different design option from pentaerythritol.

THEIC COMPARED WITH OTHER ISOCYANURATES
THEIC should also be distinguished from other isocyanurate-based materials. Tris(2-hydroxyethyl) Isocyanurate contains three hydroxyethyl substituents and therefore has three hydroxyl groups. Other isocyanurate compounds may contain different substituents, different reactive groups or different physical properties. Similar names do not necessarily mean equivalent formulation behavior. When purchasing an isocyanurate material, the CAS number, molecular formula and functional groups should therefore be verified rather than relying only on the product name.

THEIC AND WIRE ENAMEL RESIN DESIGN
In wire enamel formulation, THEIC can be incorporated into polyester or polyurethane-related resin systems. The objective is typically to achieve a controlled combination of thermal endurance, adhesion, mechanical strength, flexibility and electrical insulation. Historical patents describe THEIC-containing wire enamels designed for heat-resistant substrates and metal wires. 

Some systems use THEIC as part of a binder component containing groups reactive toward isocyanates. The choice of THEIC grade is important because impurities, moisture and particle characteristics can influence resin synthesis and processing. A technical buyer should therefore request the current specification rather than purchasing solely on the basis of CAS number.

THEIC AND PVC STABILIZER FORMULATION
In PVC stabilizer systems, THEIC may be used as one component of a multi-component stabilizer package. The purpose is to support thermal processing performance and the desired properties of the finished PVC. The actual stabilizer package can contain multiple organic and inorganic components. THEIC should therefore be evaluated for compatibility with the other stabilizer components, lubricants, pigments and processing aids. A development formulation should be tested under the intended extrusion, calendaring or molding conditions before production scale-up.

THEIC AND COATING RESIN FORMULATION
For coating resins, THEIC can be used where a multifunctional hydroxyl component is required. Its three hydroxyl groups can participate in resin synthesis or curing, while its ring structure can become part of the polymer architecture.

The formulator can adjust THEIC content to control branching and crosslink density. This can be useful when balancing hardness and thermal performance against flexibility and processability.
The final coating should be evaluated for viscosity, storage stability, application behavior, curing response, adhesion, hardness, flexibility and chemical resistance.

STARTER FORMULATION APPROACH FOR THEIC POLYESTER SYSTEMS
A basic THEIC polyester development architecture can contain:

THEIC

Polyol component

Dicarboxylic acid or anhydride component

Additional multifunctional monomer

Catalyst

Solvent or reactive diluent where applicable

Antioxidant or stabilizer where required

Pigment or filler where applicable

The exact ratio should be calculated from functional equivalents rather than copied from a generic weight percentage. THEIC contributes three hydroxyl groups per molecule, so its hydroxyl functionality must be included in the resin stoichiometry. A laboratory development program can begin with several THEIC levels around a baseline formulation and then compare viscosity, molecular weight development, gel tendency, curing behavior and final film properties.

STARTER FORMULATION APPROACH FOR THEIC POLYURETHANE SYSTEMS
A basic THEIC polyurethane development architecture can contain:

THEIC

Polyol or polyester polyol

Polyisocyanate

Catalyst

Solvent or reactive diluent where applicable

Flow additive

Defoamer

Adhesion promoter where required

Pigment or filler where applicable

The NCO/OH equivalent ratio should be calculated from the total hydroxyl functionality of THEIC and the other polyols. THEIC should not be added simply according to a fixed percentage without recalculating the overall hydroxyl balance. Increasing THEIC can increase multifunctionality and potentially increase network density. The development target should therefore be defined around the required hardness, thermal resistance, flexibility and curing response.

STARTER FORMULATION APPROACH FOR WIRE ENAMEL DEVELOPMENT
A simplified development architecture for a THEIC-containing wire enamel can contain:

THEIC-containing polyester or polyester-imide resin

Polyisocyanate or blocked isocyanate component where required

THEIC

Catalyst

Solvent system

Flow-control additive

Surface-control additive

Thermal stabilizer where required

The actual composition must be developed for the wire diameter, conductor material, coating method and target electrical class. Wire-enamel systems are specialized formulations and should not be treated as generic industrial coatings. Historical patents demonstrate that THEIC-containing wire enamels can be formulated for metal-wire coating and that the compound can influence processing and cured coating performance.

STARTER FORMULATION APPROACH FOR PVC STABILIZER DEVELOPMENT
A basic THEIC-containing PVC development architecture can contain:

PVC resin

Primary heat stabilizer

THEIC

Secondary stabilizer

Lubricant

Processing aid

Impact modifier where required

Pigment

Filler

Antioxidant where required

The exact role of THEIC depends on the stabilizer technology. Laboratory testing should compare static thermal stability, dynamic thermal stability, color retention, processing torque and final mechanical properties.

FORMULATION VARIABLES THAT AFFECT THEIC PERFORMANCE
THEIC performance is influenced by more than dosage. Resin functionality, hydroxyl equivalent, acid value, catalyst concentration, curing temperature, reaction time, solvent selection and moisture can all affect the final result.

Particle size can also influence how quickly solid THEIC disperses or dissolves during processing. A fine powder may behave differently from a granular grade during charging and mixing. Moisture is particularly important in systems containing moisture-sensitive reactive groups. The supplier's moisture specification should therefore be reviewed when THEIC is used in polyurethane or other reactive systems.

THEIC QUALITY GRADES
Commercial THEIC can be offered in different grades depending on the intended application. Supplier literature may identify industrial, reagent, electronic, pharmaceutical, agricultural, food or other application-oriented grades, although the actual availability and regulatory suitability must be confirmed with the supplier.

For polymer applications, purity, moisture, particle size, color, ash or inorganic residue and reaction-related impurities can be more important than a generic statement that the product is “high purity.” For wire enamel and electrical insulation, the relevant specification may be especially strict because impurities can affect resin synthesis, electrical performance or coating quality. For research and laboratory applications, reagent-grade documentation may be more relevant than an industrial bulk specification.

THEIC PARTICLE SIZE AND HANDLING
Particle size can influence dissolution, dispersion and feeding behavior. A fine THEIC powder may disperse differently from a coarse or granular grade, particularly in high-viscosity resin systems.

Granular THEIC can sometimes be easier to handle in industrial feeding systems because of reduced dust generation, although actual behavior depends on granule strength, particle size distribution and production equipment. The appropriate form should therefore be selected according to the charging system, mixing equipment and formulation process.

THEIC STORAGE
THEIC should be stored in a dry, well-ventilated area in accordance with the supplier's SDS and product specification. Containers should remain properly closed to prevent contamination and unnecessary exposure to atmospheric moisture.

The material should be protected from incompatible chemicals and handled using appropriate industrial hygiene procedures. Storage conditions should always follow the manufacturer's current documentation because recommended temperature, humidity and shelf-life conditions can vary by grade and packaging.

THEIC SAFETY AND HANDLING
Safety information should be taken from the current SDS for the exact grade being purchased. TCI's current product information for Tris(2-hydroxyethyl) Isocyanurate carries GHS classifications including H315, Causes skin irritation, and H319, Causes serious eye irritation.

Appropriate protective gloves and eye protection should therefore be used during handling, particularly when weighing or transferring powder. Dust generation should be minimized, and local occupational exposure requirements should be followed.

THEIC should not be treated as harmless simply because it is used in polymer manufacturing. Raw-material handling and finished-product exposure are different risk assessments, and the finished polymer may have different properties from the unreacted raw material. Workers should follow the SDS, plant chemical-handling procedures and applicable occupational safety requirements.

THEIC AND ENVIRONMENTAL CONSIDERATIONS
Environmental handling requirements depend on the application, concentration, waste stream and local regulations. Unused THEIC and THEIC-containing process residues should not be discharged to drains unless specifically permitted.

Industrial facilities should manage waste according to applicable chemical and environmental regulations. Spill response should be based on the SDS for the exact product. THEIC-containing cured polymers should also be evaluated according to the disposal or recycling route applicable to the final material. The presence of THEIC does not by itself determine the complete environmental profile of a finished polymer.

THEIC PURCHASING CRITERIA
When purchasing THEIC, the CAS number should be verified first.

CAS No: 839-90-7

EC / EINECS No: 212-660-9

Molecular formula: C9H15N3O6

Molecular weight: 261.23 g/mol

Purity: Required grade specification

Appearance: White powder or crystalline solid

Moisture: Supplier specification

Particle size: Supplier specification

Bulk density: Supplier specification where relevant

Packaging: Supplier specification

Country of origin: Supplier specification

Shelf life: Supplier specification

Technical grade: Application dependent

Required documents: TDS, SDS and COA

For high-performance applications, buyers should also specify the intended use. A THEIC requirement for wire enamel may have different quality priorities from a requirement for laboratory synthesis or PVC stabilizer development. The purchasing decision should therefore be based on both chemical identity and technical specification. Two products carrying the same CAS number can still differ in purity, particle size, packaging and commercial grade.

TDS, SDS AND COA FOR THEIC
The TDS provides the technical specification of the supplied material. It may include purity, appearance, moisture, particle size, melting behavior and other parameters relevant to the grade. The SDS provides information about hazards, handling, storage, first aid, fire-fighting, accidental release, exposure controls and disposal considerations. The COA provides batch-specific analytical results. For industrial procurement, the COA is particularly useful because it confirms that the supplied batch meets the agreed specification. For critical applications such as electrical insulation, resin synthesis or high-temperature coatings, buyers should review the TDS, SDS and COA before approving a material for production.

THEIC SUPPLY AND TECHNICAL SOURCING
When sourcing Tris(2-Hydroxyethyl) Isocyanurate, buyers may search using THEIC, THEIC 839-90-7, Tris(2-Hydroxyethyl) Isocyanurate, Tris(hydroxyethyl) Isocyanurate or 1,3,5-Tris(2-hydroxyethyl)isocyanurate. These terms can identify the same chemical when they correspond to CAS 839-90-7. However, commercial names and grades should always be verified against the CAS number and supplier documentation. This is especially important when a product name is abbreviated as THEIC without additional specification. For industrial procurement, the most useful information to provide to a supplier includes the intended application, required grade, purity, quantity, packaging preference and documentation requirements.

THEIC FOR TECHNICAL BUYERS
A technical buyer selecting THEIC should first identify the intended chemical function. If the material is being used as a reactive polyol, hydroxyl functionality and purity may be central. If it is being used for wire enamel, resin compatibility and electrical insulation requirements become more important. For PVC stabilization, the buyer should consider the complete stabilizer package and processing conditions. For laboratory synthesis, reagent purity and analytical documentation may be more important than bulk packaging. The supplier should therefore be given enough information to identify the correct grade rather than simply being asked for “THEIC.”

THEIC FOR R&D ENGINEERS
R&D engineers should evaluate THEIC according to functional equivalents, not only weight percentage. Three hydroxyl groups per molecule make the compound a multifunctional component, and replacing another polyol can change the entire stoichiometric balance.

Development work should include resin viscosity, curing response, gel time where relevant, thermal properties, mechanical properties, adhesion and chemical resistance. For wire enamel, electrical and thermal testing should be performed on the final coating. For PVC, processing stability and color retention should be evaluated under actual processing conditions.

THEIC FOR FORMULATORS
Formulators should treat THEIC as a reactive material rather than as an inert filler. Its hydroxyl groups can participate in chemical reactions, so its inclusion can alter molecular weight development and network structure. This makes dosage optimization particularly important. A small change in THEIC level can have a larger effect than the same weight change of an inert additive because THEIC changes the functionality balance of the formulation.

THEIC AND FORMULATION STOICHIOMETRY
The molecular weight of THEIC is approximately 261.23 g/mol and the molecule contains three hydroxyl groups. This means its theoretical hydroxyl equivalent weight can be considered from its molecular weight divided by its hydroxyl functionality, giving approximately 87.08 g per hydroxyl equivalent. This value is useful for formulation calculations, but actual commercial calculations should follow the supplier's stated hydroxyl value and purity where available.

For example, when calculating an NCO/OH ratio in polyurethane chemistry, the total hydroxyl equivalents contributed by THEIC should be combined with those from all other hydroxyl-functional materials. This equivalent-based approach is more reliable than simply saying that a formulation contains a certain percentage of THEIC.

THEIC AND CATALYST SELECTION
Catalyst selection depends on the reaction chemistry in which THEIC is used. Polyesterification, polyurethane formation and other reactions may require different catalytic systems. A catalyst that is appropriate for one resin system may not provide the same performance in another. Catalyst concentration can also affect gel time, conversion, storage stability and final film properties. THEIC should therefore be optimized together with the catalyst system rather than independently.

THEIC AND CURING TEMPERATURE
Curing temperature affects the rate of reactions involving THEIC. Higher temperature can accelerate curing but may also influence side reactions, solvent release, film defects or thermal degradation of other components. In wire enamels, curing temperature is closely linked to line speed, coating thickness and oven design. The selected THEIC-containing resin must therefore be evaluated under actual production conditions.

THEIC AND RESIN VISCOSITY
Because THEIC is multifunctional, it can influence molecular weight development and branching during resin synthesis. As a result, it may affect viscosity significantly even when added at relatively moderate levels. The effect is not universal because resin architecture and reaction conversion determine the final molecular structure. For this reason, viscosity should be measured during resin development rather than predicted only from THEIC concentration.

THEIC AND CROSS-LINK DENSITY
Crosslink density is one of the most important formulation concepts when using THEIC in thermosetting systems. Three hydroxyl groups can allow one THEIC molecule to participate in multiple reactions, potentially increasing the connectivity of the cured network.

Higher crosslink density can improve hardness and resistance to deformation, but excessive crosslinking can reduce flexibility and increase brittleness. The correct THEIC level is therefore the level that provides the required performance balance, not necessarily the highest possible concentration.

THEIC AND THERMAL STABILITY
THEIC is associated with thermally demanding polymer applications, particularly heat-resistant wire enamels. Its rigid isocyanurate structure and ability to become incorporated into a crosslinked polymer network are relevant to this behavior. The final thermal stability depends on the complete resin structure. Thermal testing should therefore be performed on the cured polymer rather than relying solely on the raw material's thermal characteristics.

THEIC AND ADHESION
THEIC-containing resin systems can be used in coatings where adhesion to metal substrates is important. Wire enamel is a major example where the cured coating must remain attached to copper or other conductive substrates during thermal and mechanical stress. Adhesion depends on resin polarity, curing, substrate preparation, coating thickness and formulation additives. THEIC can influence the resin structure but cannot guarantee adhesion by itself.

THEIC AND FLEXIBILITY
A highly crosslinked resin is not necessarily highly flexible. Because THEIC can increase network connectivity, its concentration must be balanced with flexible polyol or polymer segments where flexibility is required. This is especially important in electrical wire coatings, where the coating may need to tolerate bending and thermal cycling. A formulation development program should therefore measure both hardness and flexibility rather than optimizing only one property.

THEIC AND SURFACE QUALITY
In coating systems, surface quality can be affected by viscosity, cure rate, solvent release, substrate wetting and network formation. THEIC can indirectly influence these variables through its effect on resin architecture. Historical wire-enamel patent literature describes the relationship between THEIC-containing formulations, processing conditions and coating quality. The practical objective is therefore not simply to maximize THEIC but to integrate it into a formulation that produces a stable coating process and the required finished-film properties.

LIMITATIONS OF THEIC
THEIC is not a universal replacement for every polyol or crosslinking component. Its multifunctionality can create excessive branching or crosslinking if it is used without appropriate stoichiometric adjustment. Its solid physical form may also require appropriate dissolution, dispersion or feeding procedures. This can be relevant in continuous industrial processes. THEIC should therefore be selected when its specific structural and reactive characteristics solve a formulation requirement.

WHEN SHOULD A FORMULATOR CONSIDER THEIC?
THEIC can be considered when a formulation requires a multifunctional hydroxyl component combined with an isocyanurate structure. It is particularly relevant to high-temperature coatings, wire enamels, polyester systems and selected polyurethane formulations. It can also be considered in PVC stabilizer development and other specialty polymer applications where the supplier's technical data support the intended use.

WHEN SHOULD A FORMULATOR NOT SIMPLY SUBSTITUTE THEIC?
THEIC should not be substituted gram-for-gram for a conventional diol or triol without recalculating functional equivalents. Its molecular structure and functionality can significantly change the resulting polymer. 

It should also not be substituted between different commercial grades without checking purity, moisture and physical specifications. For regulated or safety-critical applications, the complete technical and regulatory documentation should be reviewed before substitution.

COMMON CONFUSIONS ABOUT THEIC
THEIC is sometimes confused with cyanuric acid. They are structurally related but are not the same compound. THEIC is also sometimes confused with isocyanates because its name contains “isocyanurate.” An isocyanurate ring is not the same thing as a free isocyanate functional group.

THEIC is not itself equivalent to a conventional diisocyanate or polyisocyanate. Its principal reactive functionality in many polymer systems comes from its hydroxyl groups. THEIC should also be distinguished from tris(2-hydroxyethyl) cyanurate naming variants only when the specific database entry is unclear. For CAS 839-90-7, the chemical identity is Tris(2-Hydroxyethyl) Isocyanurate / 1,3,5-Tris(2-hydroxyethyl)isocyanurate.

THEIC AND ISOCYANATE CHEMISTRY
The similarity between the words isocyanurate and isocyanate can cause confusion during purchasing. THEIC contains an isocyanurate ring, whereas an isocyanate contains the functional group –N=C=O. In polyurethane formulations, THEIC can react with isocyanates because its hydroxyl groups are reactive toward isocyanate groups. This does not mean that THEIC itself is an isocyanate. This distinction is important for both formulation calculations and safety documentation.

THEIC AND TRIS(2-HYDROXYETHYL) ISOCYANURATE NAMING
The name Tris(2-Hydroxyethyl) Isocyanurate is the most widely recognizable full chemical name for THEIC. The shorter term THEIC is particularly common in industrial and technical discussions. The systematic name 1,3,5-Tris(2-hydroxyethyl)-1,3,5-triazine-2,4,6-trione provides additional structural information by identifying the triazine-trione ring system. Supplier and database searches may also show N,N',N''-Tris(2-hydroxyethyl)isocyanurate. These naming variants should be linked to CAS 839-90-7 when confirming identity.

INDUSTRIES USING THEIC
Electrical insulation industry

Wire enamel industry

Paints and coatings industry

Polyester resin industry

Polyurethane industry

PVC stabilization industry

Plastics industry

Synthetic resin industry

Specialty polymer industry

Adhesives and sealants industry

Chemical intermediate manufacturing

Research and development laboratories

THEIC FOR ELECTRICAL WIRE MANUFACTURING
Electrical wire manufacturers can use THEIC-containing resin systems to produce insulating enamel coatings. The coating protects the conductor and provides electrical insulation while also needing to tolerate thermal and mechanical stresses. THEIC polyester wire enamels have been documented in patent literature for electrical wire applications. These systems demonstrate the long-standing relationship between THEIC and high-performance electrical insulation coatings.

THEIC FOR MOTOR AND TRANSFORMER INSULATION
Motor and transformer insulation systems require materials capable of maintaining electrical and mechanical performance over repeated thermal cycles. THEIC-containing polyester and polyurethane systems can be relevant to the resin technologies used in these applications. The suitability of a specific THEIC-containing resin should be demonstrated through the required electrical, thermal, mechanical and aging tests.

THEIC FOR PAINTS AND COATINGS
THEIC can be used in specialized paints and coatings where reactive hydroxyl functionality and thermal performance are required. Its use is particularly established in resin systems rather than as a conventional pigment or inert filler. Coating manufacturers can use THEIC to modify resin architecture, crosslink density and final film properties.

THEIC FOR ADHESIVES AND SEALANTS
THEIC may be relevant to selected adhesive and sealant formulations where multifunctional reactive chemistry is required. The actual application depends on the resin technology and curing mechanism. Because THEIC can participate in crosslinking, it may affect hardness, cohesive strength and thermal resistance. The formulation must still retain sufficient flexibility and adhesion for the intended substrate.

THEIC FOR POLYMER MODIFICATION
THEIC can modify polymer architecture by introducing a multifunctional isocyanurate-containing structure. This can be useful in systems where thermal and mechanical performance need to be balanced with processability. The effect should be evaluated through resin synthesis and final polymer testing.

THEIC FOR RESEARCH AND DEVELOPMENT
Research laboratories may use THEIC as a multifunctional hydroxyl compound for polymer synthesis, coating development and structure-property studies. For laboratory applications, the required purity and analytical documentation may differ from those required for bulk industrial production.

THEIC AND QUALITY CONTROL
Important quality-control parameters can include:

Identification

Assay or purity

Appearance

Color

Moisture

Melting behavior

Particle size

Bulk density

Ash or inorganic residue where applicable

Acid value where relevant to a formulated resin

Hydroxyl value where relevant to the grade

The exact specification should be agreed with the supplier based on the intended application.

THEIC ANALYTICAL IDENTIFICATION
Identity can be confirmed using appropriate analytical methods such as infrared spectroscopy, chromatography, elemental analysis or other techniques appropriate to the material.
The analytical method should be selected according to the purpose of testing. A routine incoming-quality test does not necessarily need the same analytical depth as a research-grade structural characterization.

THEIC AND BATCH CONSISTENCY
For industrial polymer production, batch-to-batch consistency is important because changes in purity, moisture or particle characteristics can affect resin synthesis.
A COA should therefore be reviewed against the agreed specification for each production batch where quality control requires it.

THEIC PACKAGING
Packaging should protect the material from moisture, contamination and physical damage. Common industrial packaging can vary according to supplier and order quantity.
The appropriate packaging should be confirmed with the supplier based on storage duration, transport conditions and production scale.

THEIC PRICE AND PURCHASING
THEIC price depends on purity, grade, order quantity, packaging, origin, logistics, market conditions and technical specification. A price quoted without the specification cannot always be used for a meaningful technical comparison.
For industrial procurement, buyers should compare the complete delivered specification rather than only the price per kilogram.

A quotation request should ideally include:
Product name: THEIC / Tris(2-Hydroxyethyl) Isocyanurate

CAS No: 839-90-7

Required purity

Application

Required quantity

Packaging

Required delivery location

Required TDS

Required SDS

Required COA

Required regulatory or compliance documents

THEIC SUPPLY FROM ATAMAN KİMYA
THEIC, or Tris(2-Hydroxyethyl) Isocyanurate, is a specialty chemical raw material relevant to wire enamels, polyester resins, polyurethane systems, PVC stabilizer formulations and other polymer applications. Companies purchasing THEIC should define the intended application and required technical specification before selecting a commercial grade.

Ataman Kimya can evaluate THEIC supply requirements according to the requested application, quantity, grade and documentation needs. The current product availability, origin, packaging, specification and quotation should be confirmed directly before ordering.

Companies requesting THEIC supply can provide the following information:
Application sector and final use

Required THEIC grade

Required purity

Estimated order quantity

Preferred packaging

Required particle form

Required TDS

Required SDS

Required COA

Required regulatory documentation

Existing specification or competing product information, if available
Providing the application information can help identify whether the requested THEIC specification is appropriate for wire enamel, polyester resin, polyurethane chemistry, PVC stabilization, laboratory synthesis or another technical use.

FREQUENTLY ASKED QUESTIONS ABOUT THEIC TRIS(2-HYDROXYETHYL) ISOCYANURATE

What is THEIC?
THEIC is the common abbreviation for Tris(2-Hydroxyethyl) Isocyanurate, a multifunctional organic compound containing an isocyanurate ring and three hydroxyethyl groups. It is mainly used in polymer, coating, electrical insulation and specialty chemical applications.

What is the chemical name of THEIC?
The commonly used chemical name is Tris(2-Hydroxyethyl) Isocyanurate. A systematic name is 1,3,5-Tris(2-hydroxyethyl)-1,3,5-triazine-2,4,6-trione.

What is the CAS number of THEIC?
The CAS number of THEIC is 839-90-7. PubChem and ChemicalBook identify Tris(2-Hydroxyethyl) Isocyanurate under this CAS number.

What is the EC / EINECS number of THEIC?
The EC / EINECS number associated with THEIC is 212-660-9. Current European chemical terminology generally uses EC Number rather than EINECS Number.

What is the molecular formula of THEIC?
The molecular formula of THEIC is C9H15N3O6.

What is the molecular weight of THEIC?
The molecular weight of THEIC is approximately 261.23 g/mol.

What does THEIC stand for?
THEIC stands for Tris(2-Hydroxyethyl) Isocyanurate. It is the standard abbreviation frequently used for this chemical in technical and industrial literature.

Is THEIC a polyol?
THEIC can function as a multifunctional hydroxyl-containing component because it contains three hydroxyl groups. In polymer chemistry it can therefore be used as a multifunctional polyol or reactive hydroxyl component.

Is THEIC a crosslinking agent?
THEIC can act as a crosslinking or network-forming component in suitable polymer systems because one molecule contains three hydroxyl groups. Its exact role depends on the chemistry and stoichiometry of the formulation.

Is THEIC used in polyurethane?
Yes. THEIC can be incorporated into polyurethane systems because its hydroxyl groups can react with isocyanate-functional components. Historical patent literature specifically describes THEIC-containing polyurethane-based wire-lacquer systems.

Is THEIC used in polyester resin?
Yes. THEIC is used in selected polyester resin systems and is particularly associated with wire-enamel chemistry. Its multifunctional hydroxyl structure can influence resin branching and crosslinking.

Is THEIC used in wire enamel?
Yes. Heat-resistant wire enamel is one of the best-established applications of THEIC. THEIC-containing polyester and polyurethane-related wire-enamel systems are documented in technical and patent literature.

Why is THEIC used in wire enamel?
THEIC provides multifunctional hydroxyl functionality and an isocyanurate ring that can become part of the resin structure. This combination can contribute to the thermal, mechanical and processing characteristics required from electrical insulation coatings.

Is THEIC used as a PVC stabilizer?
THEIC can be used as a component in PVC heat-stabilizer systems. Commercial technical literature identifies PVC stabilization among its applications, although the complete stabilizer package determines the final performance.

Is THEIC a flame retardant?
THEIC can be associated with flame-resistant polymer systems and is reported in some supplier literature for flame-retardant-related polymer applications. However, it should not automatically be treated as equivalent to a conventional dedicated flame-retardant additive.

Is THEIC water soluble?
The solubility of THEIC depends on the solvent and test conditions. Supplier and chemical database information should be consulted for the exact grade and solvent system being used.

Is THEIC soluble in chloroform?
TCI lists THEIC as insoluble in chloroform.

Is THEIC soluble in benzene?
TCI lists THEIC as insoluble in benzene.

What is the appearance of THEIC?
THEIC is generally supplied as a white powder or crystalline solid. Some commercial products may be supplied in granular form.

Is THEIC a liquid?
No. Pure THEIC is normally supplied as a solid powder or crystalline material. A formulation containing THEIC may of course be supplied as a liquid resin, solution or dispersion.

What are the main functional groups in THEIC?
THEIC contains three hydroxyl groups and three carbonyl groups within an isocyanurate ring system. The hydroxyl groups are particularly important for polymer reactivity.

What is the structure of THEIC?
THEIC contains a 1,3,5-triazine-2,4,6-trione ring with three 2-hydroxyethyl substituents attached to the ring nitrogen atoms.

What is the difference between THEIC and cyanuric acid?
Cyanuric acid and THEIC are structurally related but different compounds. THEIC is the tris(2-hydroxyethyl) derivative and contains three hydroxyethyl groups.

What is the difference between THEIC and isocyanate?
THEIC contains an isocyanurate ring and hydroxyl groups, whereas isocyanates contain the reactive –N=C=O functional group. THEIC can react with isocyanates through its hydroxyl groups, but THEIC itself is not an isocyanate.

What is the difference between THEIC and trimethylolpropane?
Both compounds can provide three hydroxyl groups, but their structures are different. THEIC contains a rigid isocyanurate ring, whereas trimethylolpropane has an aliphatic carbon framework.

What is the difference between THEIC and pentaerythritol?
Pentaerythritol contains four hydroxyl groups, while THEIC contains three. THEIC also contains an isocyanurate ring, giving the two compounds different molecular structures and polymer-formulation behavior.

Can THEIC improve heat resistance?
THEIC can contribute to heat-resistant polymer systems, particularly when it is incorporated into suitable resin architectures. The thermal performance of the final product depends on the complete formulation.

Can THEIC improve hardness?
THEIC can contribute to increased network connectivity in suitable crosslinked systems, which may increase hardness. Excessive crosslinking can reduce flexibility, so the formulation must be optimized.

Can THEIC improve chemical resistance?
THEIC can contribute to the chemical resistance of certain cured polymer systems by influencing network structure. The final chemical resistance must be determined experimentally for the actual formulation.

Can THEIC improve adhesion?
THEIC can influence resin architecture and therefore may contribute indirectly to adhesion in suitable coatings. Adhesion depends on the complete resin, substrate and curing system.

Is THEIC suitable for high-temperature coatings?
THEIC is used in high-temperature coating systems, especially heat-resistant wire enamels. The final temperature performance depends on the resin and curing system.

What documents should be requested when purchasing THEIC?
The main documents are the TDS, SDS and COA. Depending on the application, additional regulatory, quality or compliance documents may also be required.

What should be checked on the THEIC COA?
The COA should be checked against the agreed specification and may include purity, appearance, moisture, particle size and other grade-specific analytical parameters.

What should be checked on a THEIC TDS?
The TDS should provide the product identity, technical specification, appearance, purity or assay, physical properties and other parameters relevant to the intended application.

What should be checked on the THEIC SDS?
The SDS should be reviewed for hazard classification, handling, storage, exposure control, personal protective equipment, accidental release, fire-fighting and disposal information.

How should THEIC be stored?
THEIC should be stored according to the current supplier SDS and technical specification, generally in a dry and protected environment with the original container properly closed.

Is THEIC hazardous?
The exact hazard classification depends on the applicable regulatory system and product documentation. TCI currently lists H315, skin irritation, and H319, serious eye irritation, for its THEIC product.

Does THEIC require protective equipment?
Appropriate protective gloves and eye protection should be used when handling THEIC, and dust generation should be minimized. The current SDS should be followed for the exact commercial grade.

Is THEIC used in electrical insulation?
Yes. THEIC-containing polyester and polyurethane-related systems are used in electrical insulation applications, particularly wire enamels.

Is THEIC used in paints?
Yes. THEIC can be incorporated into selected coating and paint-resin systems, especially where multifunctional hydroxyl chemistry and thermal performance are required.

Is THEIC used in adhesives?
THEIC can be relevant to selected adhesive systems where multifunctional reactive chemistry is useful. The suitability depends on the adhesive resin and curing mechanism.

Is THEIC used in plastics?
Yes. THEIC is used in selected plastics and PVC-related applications, including heat-stabilizer systems and polymer modification.

Is THEIC used as a chemical intermediate?
Yes. THEIC can be used as an intermediate or reactive building block in selected organic and polymer synthesis applications.

Why is THEIC useful to polymer formulators?
THEIC combines three hydroxyl groups with a rigid isocyanurate structure. This allows formulators to modify polymer functionality and network structure while introducing an isocyanurate-containing molecular component.

Can THEIC replace another triol?
Not automatically. Although THEIC contains three hydroxyl groups, its molecular structure is substantially different from conventional triols, so substitution must be evaluated through equivalent calculations and performance testing.

Can THEIC replace trimethylolpropane?
It may be possible in some formulation-development contexts, but it should not be treated as a direct gram-for-gram replacement. The different molecular structure can change viscosity, branching, crosslink density and final properties.

Can THEIC replace pentaerythritol?
THEIC and pentaerythritol have different hydroxyl functionality and molecular structures. Any replacement requires recalculation of functional equivalents and validation of the final polymer properties.

What is the most important property of THEIC?
There is no single property that determines THEIC's value across all applications. Its combination of three hydroxyl groups and a rigid isocyanurate ring is the key structural feature behind many of its technical uses.

THEIC – TECHNICAL SUMMARY
THEIC, or Tris(2-Hydroxyethyl) Isocyanurate, is a multifunctional organic compound with CAS No. 839-90-7 and EC / EINECS No. 212-660-9. Its molecular formula is C9H15N3O6 and its molecular weight is approximately 261.23 g/mol. The molecule contains a 1,3,5-triazine-2,4,6-trione isocyanurate ring and three 2-hydroxyethyl groups. The three hydroxyl groups provide reactive functionality, while the isocyanurate ring contributes a comparatively rigid heterocyclic structure.

This combination makes THEIC useful as a multifunctional reactive component in polymer and resin chemistry. It can participate in polyester and polyurethane systems, contribute to crosslinking or network formation, and influence the thermal and mechanical behavior of the resulting material.

One of the most established applications of Tris(2-Hydroxyethyl) Isocyanurate is heat-resistant wire enamel. THEIC-containing polyester and polyurethane-related wire-enamel systems have been described in patent literature for electrical insulation coatings.

THEIC is also used in selected PVC stabilizer systems, coatings, polyester resins, polyurethane systems, specialty polymers and chemical synthesis. Commercial sources identify heat stabilizers, crosslinking applications, wire enamels, PVC stabilization and polymer intermediates among its uses.

For formulators, the main technical value of THEIC is not simply its molecular weight or physical appearance. Its value comes from the relationship between its multifunctional hydroxyl groups and its isocyanurate ring.

For technical buyers, the most important purchasing parameters include CAS number, purity, moisture, particle form, particle size, packaging, application grade and batch documentation. TDS, SDS and COA should be reviewed before commercial approval.

THEIC should be selected according to the intended formulation rather than treated as a universal replacement for other polyols or crosslinking materials. Equivalent-based formulation calculations and final-product testing are particularly important when changing from another multifunctional hydroxyl compound.

For companies sourcing THEIC, the intended application, required grade, purity, quantity, packaging and documentation should be communicated to the supplier. Current availability, origin, specification and commercial terms should be confirmed before ordering.