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Toluene diisocyanate (TDI) is prepared in three steps from toluene via dinitrotoluene and 2,4-diaminotoluene (TDA).
Toluene diisocyanate (TDI) is subjected to phosgenation, i.e., treatment with phosgene to form TDI.
Toluene diisocyanate (TDI) final step produces HCl as a byproduct and is a major source of industrial hydrochloric acid.
CAS Number: 26471-62-5
Molecular Formula: C9H6N2O2
Molecular Weight: 174.15614
EINECS Number: 247-722-4
Synonyms: 2,4-Diisocyanato-1-methylbenzene, 584-84-9, 2,4-Toluene diisocyanate, 2,4-Diisocyanatotoluene, Tolylene-2,4-diisocyanate, TOLUENE 2,4-DIISOCYANATE, Toluene-2,4-diisocyanate, 2,4-Tolylene diisocyanate, 2,4-TDI, Benzene 2,4-diisocyanato-1-methyl-, Hylene TLC, Toluylene-2,4-diisocyanate, Di-iso-cyanatoluene, Hylene T, Diisocyanat-toluol, Mondur TD, Toluen-disocianato, Tuluylendiisocyanat, Mondur TDS, Desmodur T80, Tolueen-diisocyanaat, 2,4-Toluenediisocyanate, Toluilenodwuizocyjanian, Mondur TD-80, Nacconate IOO, Cresorcinol diisocyanate, Tolyene 2,4-diisocyanate, Di-isocyanate de toluylene, Isocyanic acid 4-methyl-m-phenylene ester, NCI-C50533, TDI-80, DTXSID7026156, Nacconate 100, Toluene 2,4-diisocyanato-, 4-Methyl-1,3-phenylene diisocyanate, Toluene-2,4-diyl diisocyanate, 4-Methyl-m-phenylene isocyanate, 2,4-Toluylene Diisocyanate, 17X7AFZ1GH, AI3-15101, 2,4-tolylenediisocyanate, NSC-4791, NSC-56759, DTXCID901361, 2,4 Toluenediisocyanate, Toluene 2,4 Diisocyanate, 2,4-Diisocyanate Toluene, Diisocyanatoluene, Niax TDI, Niax TDI-P, meta-toluene diisocyanate, RefChem:933176, 2,4-toluene-diisocyanate, 2,4TDI, 4-Methyl-phenylene diisocyanate, TOLYENE-2,4-DIISOCYANATE, 4-Methyl-meta-phenylene diisocyanate, 209-544-5, 4-Methyl-phenylene isocyanate, TOLUENE DIISOCYANATE, Tolylene diisocyanate, 4-Methyl-m-phenylene diisocyanate, Tolylene 2,4-diisocyanate, TDI, RCRA waste number U223, NSC 4791, 1321-38-6, CHEBI:53556, 2,4-diisocyanato-1-methyl-benzene, MFCD00002011, CHEMBL1086446, Isocyanic acid methylphenylene ester, 4-methylbenzene-1,3-diisocyanate, Benzene-4-diisocyanato-1-methyl-, TDI commercial grade (80% 2,4- / 20% 2,6-), Diisocyanat-toluol [German], Tuluylendiisocyanat [German], Tolueen-diisocyanaat [Dutch], Toluen-disocianato [Italian], CAS-584-84-9, CCRIS 3742, HSDB 874, Toluilenodwuizocyjanian [Polish], Di-isocyanate de toluylene [French], EINECS 209-544-5, UNII-17X7AFZ1GH, BRN 0744602, Hylene TCPA, Hylene TRF, Hylene TM, tolylenediisocyanate, Hylene TM-65, 4963-53-5, Rubinate TDI 80/20, 2,4-DIISOCYANATE, DSSTox_CID_1361, Epitope ID:115138, EC 209-544-5, Benzene diisocyanatomethyl-, DSSTox_RID_77374, DSSTox_GSID_24341, SCHEMBL15384, 2,4-TDI analytical standard, SCHEMBL2477743, SCHEMBL2836347, 2,4-Diisocyanato-1-methylbenzene, SCHEMBL19668132, SCHEMBL28553401, SCHEMBL29350148, NSC4791, Tolylene-2,4-diisocyanate 95%, TOLUENE 2,4-DI-ISOCYANATE, NSC56759, TOLUENE DIISOCYANATE 2,4-, Tox21_200144, Tox21_202058, Tox21_300160, BDBM50318488, SBB064237, STL301891, Tolylene Diisocyanate (2,4 / 2,6 mix), AKOS000119430, TOLUENE 2,4-DIISOCYANATE [MI], Toluene-2,4-diisocyanate tech. 80%, NCGC00091095-01, NCGC00091095-02, NCGC00091095-03, NCGC00091095-04, NCGC00091095-05, NCGC00253965-01, NCGC00257698-01, NCGC00259607-01, TOLUENE 2,4-DIISOCYANATE [HSDB], BS-44197, FT160363, Tolylene Diisocyanate (mix isomers), 2,4- & 2,6-TDI, CAS-26471-62-5, NS00005144, ST50825051, T0263, EN300-20220, A831895, Q415183, Tolylene-2,4-diisocyanate technical 80%, Z104477324, Toluene-2,4-diisocyanate ≥98% GC, InChI=1/C9H6N2O2/c1-7-2-3-8(10-5-12)4-9(7)11-6-13/h2-4H,1H, 1,3-diisocyanatomethyl-benzen;1,3-diisocyanatomethyl-Benzene;Tolylene Diisocyanate (2,4- ca. 80%, 2,6- ca. 20%);Toluene diisocyanate, 98%, mixture of 80% 2,4- and 20% 2,6-form;Tolylene Diisocyanate (2;Tolylene diisocyanate 26471-62-5 TDI;benzene,1,3-diisocyanatomethyl-;benzene,1,3-diisocyanato-methyl-(2,4-and2,6-(80:20)
Toluene diisocyanate (TDI) is used to manufacture microcellular polyurethane products such as shoe soles, automotive steering wheels, and vibration-damping components.
These materials benefit from the controlled reaction profile of the TDI mixture, which allows precise tuning of hardness, density, and elasticity.
Toluene diisocyanate (TDI) versatility makes the mixture essential in industries requiring lightweight yet strong polymeric materials.
Toluene diisocyanate (TDI) is an organic compound with the formula CH3C6H3(NCO)2.
Two of the six possible isomers are commercially important: Toluene diisocyanate (TDI) and 2,6-TDI (CAS: 91-08-7).
Toluene diisocyanate (TDI) is produced in the pure state, but TDI is often marketed as 80/20 and 65/35 mixtures of the 2,4 and 2,6 isomers respectively.
Toluene diisocyanate (TDI) is produced on a large scale, accounting for 34.1% of the global isocyanate market in 2000, second only to MDI.
Approximately 1.4 billion kilograms were produced in 2000.
All isomers of Toluene diisocyanate (TDI) are colorless, although commercial samples can appear yellow.
The mixture is used, among other things, in the manufacture of upholstery, mattresses, shoe soles, adhesives, hardeners, paints, coatings and lubricants.
Many high-quality paints for aircraft, railcars and motor vehicles contain toluene diisocyanate 80/20.
Toluene diisocyanate (TDI) refers to a mixture of two main isomers of toluene diisocyanate: toluene 2,4-diisocyanate and toluene 2,6-diisocyanate.
Toluene diisocyanate (TDI) combination is widely used in industry due to its effectiveness and versatility in various applications.
Clear or pale yellow low-viscosity liquid with a melting point of about 15 °C and a characteristic pungent odor.
Toluene diisocyanate (TDI) is a mixture of 80% 2.4-isomer and 20% 2.6-isomer.
Toluene diisocyanate (TDI) is a raw material for the production of varnishes, adhesives, sealants, various elastomers.
The mixture is also used in coatings, adhesives, sealants, and elastomers where it reacts with polyols to form strong, durable polyurethane polymers.
These polymers provide excellent abrasion resistance, chemical stability, and flexibility, making them ideal for construction materials, industrial flooring, and protective coatings.
In elastomer production, Toluene diisocyanate (TDI) contributes to high tensile strength and long-term performance under mechanical stress.
Toluene diisocyanate (TDI) is an aromatic diisocyanate that is a clear, pale yellow liquid with a sharp, pungent odor, which is insoluble in water and miscible with most common organic solvents.
Toluene diisocyanate (TDI) consists of two isomers: toluene-2,4-diisocyanate (2,4-TDI) and toluene-2,6-diisocyanate (2,6-TDI) (CAS No. 91- 08-7), which is commercially produced in different ratios.
The most common ratio is Toluene diisocyanate (TDI) is widely used and accounted for 34% of the global isocyanate market in 2000.
Toluene diisocyanate (TDI) is an industrial chemical mixture composed of approximately eighty percent 2,4-toluene diisocyanate and twenty percent 2,6-toluene diisocyanate, both of which are highly reactive aromatic diisocyanates.
This mixture is a clear to pale yellow liquid with a strong pungent odor and high vapor reactivity under normal industrial temperature conditions.
Because of its high reactivity toward compounds containing active hydrogen groups, it serves as a key raw material in polyurethane chemistry.
Toluene diisocyanate (TDI) is considered the industry standard because it provides an optimal balance between reactivity, polymer flexibility, and processing stability during the production of polyurethane products.
This ratio ensures predictable curing behavior, consistent foam cell structure, and reliable mechanical performance across multiple polyurethane applications.
Toluene diisocyanate (TDI) has become one of the most widely used diisocyanate mixtures in global polyurethane manufacturing.
Toluene diisocyanate (TDI) is primarily used to produce flexible polyurethane foams that appear in mattresses, pillows, upholstered furniture, automotive seating, and sound-absorbing materials.
Toluene diisocyanate (TDI) is an aromatic isocyanate that is produced for reaction with polyols to form polyurethanes.
Toluene diisocyanate (TDI) is widely used in the production of polyester-based soft foam, high-bearing sponges, semi-rigid ester foam, and paint.
Toluene diisocyanate (TDI) is an important starting material for the production of polyurethane, polyurethane foam and other elastomeric plastics.
Melting point : 19.5–21.5 °C
Boiling point : 247 °C
Density : 1.22
Vapor pressure : 0.03 hPa (20 °C)
Refractive index : 1.5660–1.5700
Flash point : 137 °C
Storage temp. : Store below +30 °C
Solubility : Miscible with ether, acetone, benzene
Form : Clear liquid
Color : Colorless to light yellow
Odor : Sharp, pungent odor
Explosive limit : 0.9–9.5% (v/v)
Viscosity : 2.221 mm²/s
Water solubility : 124 mg/L at 25 °C
LogP : 3.43 at 22 °C
Toluene diisocyanate (TDI) is also used to create specialty polyurethane coatings that resist abrasion, solvents, moisture, and extreme temperatures.
These coatings are applied to industrial machinery, protective equipment, transport containers, and high-performance flooring systems where long-term durability is crucial.
The chemical backbone of Toluene diisocyanate (TDI)-derived coatings provides a strong, crosslinked structure that maintains integrity even under heavy mechanical stress.
In footwear manufacturing, Toluene diisocyanate (TDI) serves as a critical raw material for the production of flexible and durable polyurethane shoe soles.
These soles offer superior shock absorption, surface grip, and elasticity, making them suitable for athletic footwear, work boots, and casual shoes.
The material’s resistance to cracking, tearing, and environmental degradation enhances the longevity and performance of finished footwear products.
The electronics industry uses Toluene diisocyanate (TDI) in encapsulation materials and potting compounds designed to protect sensitive circuits from moisture, vibration, and thermal fluctuations.
Polyurethane encapsulants formed from TDI mixtures provide excellent electrical insulation while maintaining flexibility and structural stability.
This makes them particularly useful in sensors, power supplies, communication devices, and automotive electronic modules.
TDI 80/20 can also be formulated into adhesives and sealants that exhibit high tensile strength, excellent adhesion to diverse substrates, and long-term stability.
These adhesives are used in industrial assembly lines, construction projects, and packaging applications where strong and reliable bonding is required.
The fast-curing nature of Toluene diisocyanate (TDI)-based systems improves production efficiency and reduces downtime in manufacturing environments.
Because of its high reactivity, Toluene diisocyanate (TDI) is sometimes used in the development of polymer-modified materials that enhance surface hardness, flexibility, or chemical resistance.
These modified materials appear in printing rollers, gasket formulations, elastomeric seals, and wear-resistant industrial parts.
The combination of toughness and flexibility provided by TDI-derived polymers allows these materials to withstand harsh operating conditions.
The isocyanate functional groups in Toluene diisocyanate (TDI) react with hydroxyl groups to form carbamate (urethane) links.
The two isocyanate groups in Toluene diisocyanate react at different rates: The 4-position is approximately four times more reactive than the 2-position.
Toluene diisocyanate (TDI) is a symmetrical molecule and thus has two isocyanate groups of similar reactivity, similar to the 2-position on 2,4-TDI.
However, since both isocyanate groups are attached to the same aromatic ring, reaction of one isocyanate group will cause a change in the reactivity of the second isocyanate group.
A 80:20 mixture of the 2,4 and 2,6 isomers of Toluene diisocyanate (TDI).
Toluene diisocyanate (TDI) is a low viscosity, difunctional isocyanate widely used in flexible foam applications.
Toluene diisocyanate (TDI) may be applied to automotive seating, furniture cushioning, mattress cushioning and specialty foam applications.
It is also used as a reactive intermediate in coating, adhesive, sealant and prepolymer applications.
Toluene diisocyanate (TDI) is a colorless, yellow, or dark liquid or solid.
Toluene diisocyanate (TDI) has a sweet, fruity, pungent odor.
Toluene diisocyanate (TDI) is an 80: 20 mixture of 2,4-and 2,6-isomers.
Toluene diisocyanate (TDI) is used in the production of thermal and acoustic insulation, as well as floor and wall coverings, offering insulating and sound-dampening properties.
Toluene diisocyanate (TDI) is a synthetic organic chemical.
It is a natural derivative of primary amines with the general formula R–N]C]O which does not occur naturally in the environment.
At room temperature, it can be a liquid or crystal.
Toluene diisocyanate (TDI) is miscible with alcohol, diglycol, monoethyl ether, ether, acetone, carbon tetrachloride, benzene, chlorobenzene, kerosene, and olive oil; however, it may react violently with alcohol, water, acid, bases, and strong alkaline materials and tertiary amines and generate enough heat to self-ignite and release toxic combustion products.
Toluene diisocyanate (TDI) reacts with water and most acids producing unstable carbonic acids, which subsequently decarboxylate yielding relatively chemically inert and insoluble polymeric urea.
Studies indicate that hydrolysis is the dominant process in determining the overall environmental fate, transport, and bioaccumulation potential of Toluene diisocyanate (TDI).
Although their rapid hydrolysis in surface water reduces persistence and bioaccumulation in the environment, diisocyanates may be stable long enough to be transported some distances through the atmosphere and inhaled.
Since the hydrolysis products formed are irritants, there is a potential for inhalation exposure.
The degree stability is a function of humidity.
It is expected that Toluene diisocyanate (TDI) does not bioaccumulate because the tendency to hydrolyze rapidly makes uptake and accumulation very unlikely.
The bioconcentration factor ranges from 151 to 1183 and the bioaccumulation factor is 380.
These values indicate that Toluene diisocyanate (TDI) has a low potential for bioaccumulation in aquatic organisms.
Toluene diisocyanate (TDI) is expected to hydrolyze rapidly into its transformation products, making TDI generally unavailable to aquatic organisms.
The highly reactive properties of diisocyanates are likely to be metabolized/ degraded at rates significant enough to counter any potential for bioaccumulation or biomagnification.
Toluene diisocyanate (TDI) is anticipated that TDI released to water will primarily form inert polyureas, which have the potential to be deposited to sediment, forming an inert component of the sediment strata.
While these polyureas are persistent, studies have indicated that they pose virtually no potential for adverse impacts on the aquatic environment.
Isocyanates are highly flammable and reactive with many compounds, even with themselves.
Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions.
Reaction with moist air, water or alcohols may form amines and insoluble polyureas and react exothermically, releasing toxic, corrosive or flammable gases, including carbon dioxide; and, at the same time, may generate a violent release of heat increasing the concentration of fumes in the air.
Incompatible with amines, aldehydes, alkali metals, ammonia, carboxylic acids, caprolactum, alkaline materials, glycols, ketones, mercaptans, hydrides, organotin catalysts, phenols, strong acids, strong bases, strong reducing agents such as hydrides, urethanes, and ureas.
Elevated temperatures or contact with acids, bases, tertiary amines, and acyl-chlorides may cause explosive polymerization.
Attacks some plastics, rubber and coatings. Contact with metals may evolve flammable hydrogen gas.
May accumulate static electrical charges, and may cause ignition of its vapors.
Consult with environmental regulatory agencies for guidance on acceptable disposal practices.
Generators of waste containing this contaminant (≥100 kg/mo) must conform with EPA regulations governing storage, transportation, treatment, and waste disposal.
Controlled incineration (oxides of nitrogen are removed from the effluent gas by scrubbers and/or thermal devices).
In accordance with Toluene diisocyanate (TDI), follow recommendations for the disposal of pesticides and pesticide containers.
Must be disposed properly by following package label directions or by contacting your local or federal environmental control agency, or by contacting your regional EPA office.
Toluene diisocyanate (TDI) is a toxic and highly reactive organic compound.
The chemical formula for Toluene diisocyanate (TDI) is CH3C6H3(NCO)2.
Toluene diisocyanate (TDI) is a mixture blend of 80% 2,4-toluene diisocyanate and 20% 2,6-toluene diisocyanate.
The clear to pale yellow liquid organic compound is toxic, has a sharp odor, and is highly reactive.
Toluene diisocyanate (TDI) is used in the manufacture of polyurethane flexible foam (slab/molding) and non-foam urethanes.
Toluene diisocyanate (TDI) is a key component in the production of flexible foams, found in a variety of products from mattresses to automotive upholstery.
Its ability to react with polyols and water to form cellular structures is crucial for creating these comfortable and resilient materials.
Toluene diisocyanate (TDI) is used in the manufacture of interior components, such as seats and upholstery, due to its durability and ability to provide comfort to vehicle occupants.
A clear colorless to pale yellow liquid with a pungent odor.
Denser than water. Burns, but may be difficult to ignite.
Vapors are heavier than air vapors irritate the respiratory system.
Toxic under prolonged exposure to vapor in low concentrations or short exposure to high concentrations of vapor.
Produces toxic oxides of nitrogen during combustion used to make polyurethane foams and paints.
Toluene diisocyanate (TDI) is valued for its strong nucleophilic reactivity toward polyether and polyester polyols, which allows manufacturers to control foam expansion, curing speed, and final polymer structure with high precision.
This controlled reactivity ensures that polyurethane products derived from the mixture maintain consistent performance characteristics such as flexibility, resilience, and load-bearing capacity.
Because of these predictable reaction pathways, Toluene diisocyanate (TDI) is routinely used in mass-production environments where uniformity and efficiency are essential.
The mixture exhibits excellent compatibility with blowing agents, surfactants, catalysts, and crosslinkers used in polyurethane foam formulations.
This compatibility enables precise control over foam density, cell size, mechanical softness, and airflow properties during the foaming process.
Such tunability is crucial for applications that require foams ranging from ultra-soft cushioning materials to medium-density structural foams.
In the automotive industry, Toluene diisocyanate (TDI) is used to produce flexible and semi-rigid polyurethane components that absorb impact, reduce vibration, and improve passenger comfort.
These components include dashboard padding, headrests, seating cushions, interior noise-control panels, and steering wheel cores.
The durability and lightweight nature of polyurethane products make them preferable for automotive manufacturers seeking to enhance both comfort and fuel efficiency.
Uses:
Toluene diisocyanate (TDI) is used to produce specialty polyurethane coatings that protect surfaces from abrasion, moisture, chemical attack, and ultraviolet degradation.
These coatings are widely applied in industrial flooring, storage tanks, transportation equipment, and protective machinery coverings.
Their high-crosslink strength and long-term durability make them ideal for environments that experience heavy wear or harsh operating conditions.
Toluene diisocyanate (TDI) is highly valuable in polyurethane adhesives and sealants that require strong bonding strength, fast curing, and excellent long-term stability.
These adhesives are used to bond metals, plastics, composites, and wood in construction, packaging, and industrial assembly processes.
Their robust curing profile makes them suitable for high-performance products where reliability is essential.
In footwear manufacturing, Toluene diisocyanate (TDI) is utilized to create lightweight, flexible, and durable polyurethane shoe soles that offer exceptional shock absorption.
These soles maintain elasticity across a wide temperature range and resist cracking or tearing after extensive use.
This makes them ideal for athletic shoes, work boots, and casual footwear requiring both comfort and long-lasting performance.
The electronics industry uses Toluene diisocyanate (TDI) in the production of polyurethane encapsulants and potting compounds that protect sensitive electronic components.
These encapsulating materials shield circuits from moisture, vibration, and thermal fluctuations while maintaining excellent electrical insulation.
Such protective properties are essential in automotive electronics, communication devices, power modules, and industrial control systems.
Toluene diisocyanate (TDI) is employed in the production of microcellular polyurethane parts such as steering wheels, armrest pads, instrument panel skins, and energy-absorbing structures.
These parts benefit from the controlled density and elasticity provided by the unique Toluene diisocyanate (TDI) isomer ratio.
As a result, microcellular Toluene diisocyanate (TDI)-based materials are widely used in areas that must balance comfort with structural resilience.
Toluene diisocyanate (TDI) also plays a role in making elastomeric polyurethane products that require toughness, flexibility, and resistance to wear.
These elastomers appear in industrial rollers, gaskets, seals, wheels, vibration dampers, and precision molded components.
Their ability to withstand mechanical stress and environmental exposure makes them valuable in manufacturing, mining, transportation, and heavy equipment sectors.
In construction, Toluene diisocyanate (TDI)-derived polyurethanes are used in insulation materials, sealants, waterproofing membranes, and structural foam panels.
These materials improve energy efficiency, moisture resistance, and structural stability in residential, commercial, and industrial buildings.
Because of these benefits, polyurethane systems based on Toluene diisocyanate (TDI) contribute significantly to modern construction technologies.
Toluene diisocyanate (TDI)s are used primarily to manufacture flexible polyurethane foams for use in furniture, bedding, and automotive and airline seats.
Other, smaller uses are for polyurethane elastomers (for automobile bumper covers, industrial rollers, sport soles and boots, and mechanical goods) and coatings (for automotive refinishing, wood finishes, and high-performance anti-corrosion coatings)(ICIS 2009).
Toluene diisocyanate (TDI)–based rigid polyurethane foam is used in household refrigerators and for residential sheathing or commercial roofing in board or laminate form.
“Pour-inplace” or “spray-in” rigid foam is used as insulation for truck trailers, railroad freight cars, and cargo containers.
Polyurethane-modified alkyds contain approximately 6% to 7% isocyanate, mostly toluene diisocyanates, and are used as coating materials, such as floor finishes, wood finishes, and paints.
Moisture-curing coatings are used as wood and concrete sealants and floor finishes.
Aircraft, truck, and passenger-car coatings often are composed of toluene diisocyanate prepolymer systems.
Castable urethane elastomers are used in applications requiring strength, flexibility, and shock absorption, and are resistant to oil, solvents, and ultraviolet radiation.
They are used in adhesive and sealant compounds and in automobile parts, shoe soles,rollerskate wheels, pond liners, and blood bags.
They are also used inoil fields and mines.
Certain elastomer products are produced from the pure 2,4 isomer rather than the 80:20 mixture.
Toluene diisocyanate (TDI) is used in the production of rigid polyurethane foams with a high temperature stability.
It is also sometimes used in rocket propellants.
The functional groups in Toluene diisocyanate (TDI) react with hydroxyl groups to form urethane linkages, which are used in the manufacture of flexible polyurethane foams for use in furniture, bedding, and automotive and commercial transportation seating.
Other uses include polyurethane elastomers used in automobile bumper covers, industrial rollers, sporting footwear, as well as mechanical goods and coatings (metal, wood, and highperformance anticorrosion coatings).
Toluene diisocyanate (TDI)-based rigid polyurethane foam is used in household refrigerators and for residential construction such as sheathing and commercial roofing.
Toluene diisocyanate (TDI) spray-in rigid foam is used as insulation for truck trailers, railroad freight cars, and overseas cargo containers.
Moisture-curing Toluene diisocyanate (TDI) coatings are used as wood and concrete sealants and floor finishes.
Toluene diisocyanate (TDI) is used in the production of polyurethane flexible foams, coatings, paints, and elastomers.
Toluene diisocyanate (TDI) is more widely used than MDI (diphenylmethane diisocyanate).
Polyurethanes are formed by the reaction of isocyanates with polyhydroxy compounds.
Since the reaction proceeds rapidly at room temperature, the reactants must be mixed in pots or spray guns just before use.
These resins can be produced with various physical properties, for example, hard, flexible, semirigid foams; and have found many uses, for example, upholstery padding; thermal insulation; molds, surface coatings; shoe inner soles; and in rubbers, adhesives, paints, and textile finishes.
Because of Toluene diisocyanate (TDI)’s high volatility, exposure can occur in all phases of its manufacture and use.
Toluene diisocyanate (TDI) has a much lower volatility, and problems generally arise only in spray applications.
Toluene diisocyanate (TDI) is primarily used in the production of flexible polyurethane foams that are widely utilized in furniture, bedding, automotive seating, and upholstery.
These foams provide excellent cushioning, rebound behavior, and long-term comfort due to the balanced reactivity of the 2,4- and 2,6-isomers.
Because of its performance consistency, Toluene diisocyanate (TDI) remains the dominant raw material in the global flexible foam industry.
The mixture is also essential in manufacturing automotive interior components such as dashboards, headrests, armrests, seat cushions, and vibration-absorbing panels.
These applications rely on polyurethane’s ability to combine softness with durability while maintaining structural stability under repetitive mechanical stress.
As a result, Toluene diisocyanate (TDI)-based foams significantly improve safety, comfort, and noise reduction inside modern vehicles.
Safety Profile:
Toluene diisocyanate (TDI) is a highly reactive chemical that can cause severe irritation to the eyes, skin, and respiratory tract due to its strong isocyanate functional groups.
Even short-term exposure may lead to redness, burning sensations, or inflammation as the compound reacts with biological tissues.
For these reasons, protective equipment and strict handling protocols are essential when working with concentrated Toluene diisocyanate (TDI).
Inhalation of Toluene diisocyanate (TDI) vapors can produce acute respiratory symptoms such as coughing, shortness of breath, chest tightness, and airway irritation.
Because Toluene diisocyanate (TDI) has a high vapor pressure, small amounts can volatilize at room temperature and affect workers in poorly ventilated areas.
Repeated or high-level exposure may lead to more serious conditions, including chemical pneumonitis or lung injury.
Confirmed carcinogen with experimental carcinogenic and neoplastigenic data.
Poison by inhalation, moderately toxic by ingestion.
Severe skin irritant human mutation data reported.
Capable of producing severe dermatitis and bronchal spasm a common air contaminant.
A flammable liquid when exposed to heat or flame explosive in the form of vapor when exposed to heat or flame.
To fight fire, use dry chemical, COa potentially violent polymerization reaction with bases or acyl chlorides.
Reaction with water releases carbon dioxide.
Storage in polyethylene containers is hazardous due to absorption of water through the plastic.
When heated to decomposition it emits highly toxic fumes of NOx.
Toluene diisocyanate (TDI) is a highly reactive compound.
The toxicological properties of isocyanates are attributed to the –N=C=O group.
It is thought to react vigorously and exothermically with water forming an unstable carbamic acid that dissociates to form a primary amine with liberation of CO2.
Hence, the primary amine will react further generating a urea derivative.
Toluene diisocyanate (TDI) also reacts readily with all organic compounds resulting in polymerization.
Such reactions denature proteins, form abnormal cross-linkages, and generally disorganize the protein resulting in alteration of its normal function.
This reactivity with proteins can account for its potency as a sensitizing agent.
Thus, more than one reaction may occur in a system at a given time.
The toxic effects of TDI can be attributed to two possible toxic actions.
A primary irritant action on the mucous membranes of the eyes, and the gastrointestinal and respiratory tracts, and 2. Bronchospasm due to either a pharmacological or an immunological reaction.
This pharmacological reaction can be attributed to altered β-adrenergic function or the blockade of the S-adrenergic system by diminishing the formation of c-AMP after catecholamine stimulation or perhaps to local histamine release.
Toluene diisocyanate (TDI) may also react with naturally occurring proteins or polysaccharides to form immunohapten complexes.
