ARADUR 70

ARADUR 70 is a high-viscosity polyether urethane amine epoxy curing agent developed for flexible binder systems, impact-resistant coatings, elastomeric sealants, film adhesives, potting compounds and other epoxy technologies that require permanent flexibility rather than temporary external plasticization. Current selector data describe ARADUR 70 with approximately 16,000-27,000 mPa·s viscosity at 25°C, an amine value of approximately 65-75 mg KOH/g, an active-hydrogen equivalent weight of approximately 900 g/eq, an approximately 300-500 minute reference gel-time range with ARALDITE GY 250 and Gardner color ≤5. ARADUR 70 is distinguished by very high elongation, impact resistance, retained flexibility at low temperature and compatibility with modified or unmodified bisphenol A- and bisphenol F-based liquid epoxy resins.

PRODUCT IDENTITY

Product name: ARADUR 70
Product type: Epoxy curing agent / hardener
Chemical family: Polyamines
Specific chemistry: Polyether urethane amine / polyetherurethane amine
Physical form: Liquid
Appearance: Light-yellow to yellowish liquid according to current safety-property data
Odor: Characteristic amine odor
Viscosity at 25°C: Approximately 16,000-27,000 mPa·s in current selector literature; another current selector gives approximately 17,000-27,000 mPa·s
Amine value: Approximately 65-75 mg KOH/g
Active hydrogen equivalent weight: Approximately 900 g/eq
Density at 20-25°C: Approximately 1.02 g/cm³
Flash point: Approximately 65°C by Pensky-Martens closed-cup testing
Boiling point: Approximately 120°C in published safety-property data
Ignition temperature: Minimum approximately 300°C
Decomposition temperature: Minimum approximately 200°C
pH: Approximately 11 in a stated 500 g/L test concentration at 20°C
Water solubility: Insoluble in water according to published safety-property data
Reference gel time with ARALDITE GY 250: Approximately 300-500 minutes in current selector literature
Historical high-performance selector gel time: Approximately 298 minutes using a specified 100 g reference method at 23°C
Typical selector mix ratio: Approximately 400 parts ARADUR 70 per 100 parts reference epoxy resin in a published high-performance component selector
Theoretical stoichiometric level with epoxy resin EEW 190 g/eq: Approximately 474 parts ARADUR 70 per 100 parts resin based on AHEW 900 g/eq
Color: Gardner ≤5
Reference glass-transition range: Below approximately -10°C in published flexible-hardener selector data
Published elongation capability: Maximum elongation approximately 350% at 23°C and greater than approximately 250% at -10°C in the referenced flexible system
Primary functions: Curing agent, hardener, crosslinking agent and polymerizing agent
Primary current product positioning: Flexible binder systems, impact-resistant coatings and sealers
Additional current end uses: Base coats, elastomeric sealants, film adhesives, insulators, potting compounds, powder coatings, prepregs and tank linings
Material compatibility: Concrete surfaces, metal substrates and steel substrates in suitably formulated systems
Compatible resin classes: Modified and unmodified bisphenol A-based liquid epoxy resins and compatible bisphenol F-based liquid epoxy resins
Current product features: Chemical resistance, flexible, good elongation, good mechanical properties, high viscosity, impact resistance, improved modulus, temperature resistance and fast-cure positioning in current product labeling
Current labeling claim: Substances of Very High Concern chemicals-free
Flexibility mechanism: Reactive or internally incorporated flexibility rather than dependence on migrating external plasticizer
Low-temperature behavior: Flexibility is designed to remain effective at low temperature
Storage: Keep in a tightly closed original container in a cool, dry and well-ventilated location; protect from moisture, atmospheric carbon dioxide, direct sunlight and contamination; exact temperature range should follow the current product-specific documentation
CAS Number: Proprietary formulated polyether urethane amine mixture; no single universal CAS number should be assigned to the complete trade grade without the current SDS
EC Number: Proprietary commercial mixture; no single universal EC number should be assigned without current product-specific confirmation
Molecular Formula: Not applicable to the complete commercial formulation
Molecular Weight: Not applicable as one fixed value

Synonyms: ARADUR 70, Polyether Urethane Amine, Polyetherurethane Amine, Polyether Urethane Amine Curing Agent, Polyether Urethane Amine Hardener, Flexible Epoxy Hardener, Flexible Epoxy Curing Agent, Permanent-Flexibility Epoxy Hardener, Impact-Resistant Epoxy Hardener, Low-Temperature Flexible Epoxy Hardener, Flexible Binder Hardener, Flexible Sealer Hardener, Elastomeric Epoxy Hardener, Flexible Adhesive Hardener, Potting Epoxy Hardener, Film Adhesive Hardener, High-Viscosity Epoxy Hardener, Polyamine Crosslinker

ARADUR 70 should be treated as a proprietary formulated polyether urethane amine rather than as one pure molecular substance. Its technical identity is best defined by viscosity, amine value, active-hydrogen equivalent weight, density, cure behavior and flexible-network performance. Formal component identity, concentration ranges, hazard classification and regulatory details should be taken from the current product-specific SDS.

WHAT IS ARADUR 70?

ARADUR 70 is a specialized epoxy hardener designed to make cured epoxy systems flexible rather than conventionally rigid.
The grade contains polyether and urethane-related flexible structural segments together with reactive amine functionality capable of curing epoxy resins.
Unlike an external plasticizer that remains physically mixed into a rigid polymer and may migrate over time, ARADUR 70 becomes chemically incorporated into the epoxy network.
This reactive incorporation creates permanent flexibility and helps preserve elongation at low temperature.
The product is therefore particularly valuable in binders, coatings, sealers and adhesives exposed to impact, vibration, movement, thermal cycling or deformation.
The very high viscosity and very high AHEW distinguish ARADUR 70 strongly from ordinary low-molecular-weight amine hardeners.

POLYETHER URETHANE AMINE CHEMISTRY

Polyether urethane amine chemistry combines flexible polyether segments, urethane-related structural elements and reactive amine end groups or amine functionality.
The polyether portion contributes chain mobility and low-temperature flexibility.
Urethane-related structural segments can contribute cohesive strength, hydrogen bonding and balanced mechanical performance.
Reactive amine functionality opens epoxy rings and covalently integrates the flexible hardener into the final thermoset.
The result is a crosslinked epoxy network that can deform much more extensively than a conventional rigid amine-cured epoxy.
Because ARADUR 70 is a proprietary formulated commercial product, its exact molecular distribution should not be simplified to one discrete chemical formula.

HOW EPOXY CURING WORKS

Epoxy resins contain reactive oxirane rings. Amine hydrogens in ARADUR 70 attack these rings and form carbon-nitrogen bonds together with hydroxyl groups.
Repeated reaction creates a three-dimensional network in which flexible polyether urethane segments become part of the cured polymer structure.
The network therefore combines epoxy crosslinking with flexible chain segments rather than relying on a mobile additive to soften the cured material.
Because ARADUR 70 has a very high AHEW, a large hardener mass is required relative to ordinary amine hardeners to provide the needed reactive equivalents.
Cure progresses more slowly than with many high-amine-value hardeners, as reflected by the long standardized gel-time range.
Final flexibility, strength and chemical resistance depend on resin type, stoichiometry, cure temperature and the amount of ARADUR 70 incorporated.

PERMANENT FLEXIBILITY

Permanent flexibility is the defining performance advantage of ARADUR 70.
The flexible segments are chemically incorporated into the cured network during epoxy-amine reaction.
This differs from externally plasticized systems in which a mobile low-molecular-weight plasticizer reduces glass-transition temperature without becoming part of the network.
External plasticizers can migrate, extract or redistribute during service, causing flexibility to decline over time.
ARADUR 70 avoids relying solely on that mechanism and therefore provides flexibility that is structurally built into the thermoset.
This approach is particularly useful in coatings, sealers and adhesives exposed to mechanical movement or low temperatures.

HIGH VISCOSITY

High viscosity is one of the most important processing characteristics of ARADUR 70.
Current selector data give approximately 16,000-27,000 mPa·s at 25°C, while another high-performance selector lists approximately 17,000-27,000 mPa·s.
This viscosity is far higher than that of many conventional liquid amine hardeners.
The high viscosity affects pumping, metering, mixing and filler incorporation and can require heated process conditions or compatible reactive diluent where the formulation permits.
Temperature has a strong influence on handling because the material becomes thicker at lower temperature.
ARADUR 70 should be allowed to reach a suitable processing temperature before use, but uncontrolled heating or open-flame heating should never be used.

AMINE VALUE

Current selector literature gives ARADUR 70 an amine value of approximately 65-75 mg KOH/g.
This value is much lower than that of many conventional amine hardeners and reflects the high molecular weight of the flexible polyether urethane structure.
Amine value is useful for incoming quality control and product identity.
A major change can indicate contamination, dilution, aging or use of the wrong product.
Amine value should not be used in place of AHEW for stoichiometric formulation because total basic nitrogen and reactive amine-hydrogen equivalents are different parameters.
The combination of low amine value and high AHEW is consistent with a high-molecular-weight flexible curing agent.

ACTIVE HYDROGEN EQUIVALENT WEIGHT

ARADUR 70 has an active-hydrogen equivalent weight of approximately 900 g/eq.
This very high value is central to understanding the grade.
AHEW represents the mass of commercial hardener required to supply one equivalent of reactive amine hydrogen.
A liquid epoxy resin with EEW 190 g/eq would have a simple theoretical stoichiometric requirement of approximately 474 parts ARADUR 70 per 100 parts resin.
At EEW 185 g/eq, the theoretical level is approximately 486 parts, while at EEW 200 g/eq it is approximately 450 parts.
A published high-performance selector lists a typical reference mix ratio around 400 phr, showing that validated practical formulations can differ from a simple theoretical calculation.
Current resin-specific technical guidance should therefore control the production ratio.

REFERENCE MIX RATIO

A published high-performance component selector lists approximately 400 parts ARADUR 70 per 100 parts reference resin.
This is an unusually high hardener level compared with ordinary amine-cured epoxy systems and reflects the approximately 900 g/eq AHEW.
The simple theoretical ratio calculated with a resin EEW around 190 g/eq is higher, approximately 474 phr.
The difference demonstrates why a selector ratio and a theoretical stoichiometric ratio should not be assumed to be identical.
Reactive functionality, the exact resin used, test method and performance targets can all affect the recommended formulation.
For production use, Ataman Chemicals recommends following the current product-specific formulation guidance for the exact epoxy resin rather than using an unverified universal phr value.

GEL TIME

Current selector literature gives ARADUR 70 a reference gel-time range of approximately 300-500 minutes with ARALDITE GY 250.
An older high-performance selector reports approximately 298 minutes under its specified 100 g, 23°C comparison method.
These values indicate much slower standardized cure than the 15-60 minute ranges common to many conventional amine hardeners.
The long gel time is consistent with the high molecular weight and low amine-functionality concentration of ARADUR 70.
Current product labeling also includes fast-cure positioning, so cure speed should be understood as formulation-dependent rather than inferred from one selector test alone.
Practical cure can change substantially with resin type, temperature, accelerators, batch size and formulation chemistry.

DENSITY

Published safety-property information gives ARADUR 70 a density of approximately 1.02 g/cm³ at 20°C.
A high-performance selector gives the same approximate density at 25°C.
Density is useful for manufacturing calculations and for converting between weight and volume.
Stoichiometric metering should preferably be controlled on a mass basis because the required hardener quantity is very high.
Volumetric dispensing equipment should be calibrated to actual product temperature and density.
Density also provides a secondary incoming quality-control check when used together with viscosity and amine value.

FLASH POINT

Published safety-property data give ARADUR 70 a flash point of approximately 65°C by Pensky-Martens closed-cup testing.
This value indicates a combustible organic liquid that requires appropriate ignition control and ventilation.
The flash point is higher than that of many solvent-rich curing-agent solutions but does not eliminate fire risk.
Heating for viscosity reduction should therefore use controlled equipment rather than open flames or hot surfaces that can create ignition hazards.
The current product-specific SDS should govern storage segregation, fire response and transport classification.

WATER SOLUBILITY AND PH

Published safety-property data describe ARADUR 70 as insoluble in water.
The product is also alkaline, with a reported pH around 11 in a specified 500 g/L test condition at 20°C.
Water insolubility is consistent with the high-molecular-weight organic structure and influences cleanup and environmental behavior.
Spills should not be washed directly into drains or waterways.
The alkaline amine character also supports the need for skin and eye protection during handling.
The exact regional SDS should be used for formal first-aid and environmental guidance.

LOW GLASS-TRANSITION TEMPERATURE

Published flexible-hardener selector data give ARADUR 70 systems a glass-transition range below approximately -10°C.
A low glass-transition temperature is consistent with the intended flexible and elastomeric behavior.
Below the glass-transition region, rigid thermosets can become brittle, whereas a system with a sufficiently low Tg can retain segmental mobility and flexibility.
This makes ARADUR 70 particularly relevant to cold-service coatings, seals and adhesives.
The exact Tg of a final formulation depends on resin chemistry, hardener ratio, cure schedule and fillers.
Final low-temperature qualification should therefore be performed on the complete cured system.

ELONGATION

Published flexible-hardener data report maximum elongation around 350% at 23°C for an ARADUR 70 reference system.
The same data report elongation greater than approximately 250% at -10°C.
These values illustrate the exceptional flexibility possible compared with ordinary rigid epoxy systems.
The exact elongation of a production formulation depends on resin type, ratio, filler content, specimen geometry and cure schedule.
Adding rigid mineral filler or highly functional epoxy resin generally reduces ultimate elongation.
The published elongation values should therefore be treated as reference-system capabilities rather than universal guarantees.

LOW-TEMPERATURE FLEXIBILITY

ARADUR 70 is specifically designed to retain flexibility at low temperatures.
This is important in cold storage, outdoor structures, refrigerated equipment, transportation systems and industrial environments that cycle between warm and cold conditions.
Externally plasticized epoxy can become less flexible if plasticizer migrates or is extracted.
ARADUR 70 instead builds flexible segments into the crosslinked network.
Low-temperature flexibility can reduce cracking caused by thermal contraction, vibration or differential movement.
Actual cold-service performance should be validated at the minimum expected service temperature.

IMPACT RESISTANCE

Impact resistance is a primary current product feature and application advantage.
A flexible epoxy network can absorb impact energy through deformation rather than failing immediately by brittle cracking.
ARADUR 70 is therefore useful in coatings, sealers, potting materials and adhesives exposed to shocks or dropped-object impact.
Impact resistance depends on film thickness, resin stiffness, filler loading and substrate support.
Ceramic or mineral filler can improve wear resistance but can also reduce flexibility if loading becomes excessive.
The final system should be tested using impact methods relevant to the intended service.

GOOD ELONGATION

Good elongation is part of the current product positioning.
High elongation allows a cured epoxy layer to tolerate movement, deformation and substrate strain.
This can reduce cracking at joints, edges and bonded interfaces.
Elongation is especially useful where substrates have different coefficients of thermal expansion.
The complete formulation should balance elongation with tensile strength, modulus and chemical resistance.
A highly flexible formulation is not automatically suitable for every structural application because stiffness can be equally important.

GOOD MECHANICAL PROPERTIES

ARADUR 70 is positioned as providing good mechanical properties together with flexibility.
This combination distinguishes the grade from systems that become soft simply through heavy external plasticization.
Reactive network incorporation can preserve cohesive strength while allowing substantial deformation.
Final tensile strength, tear resistance, modulus and fatigue performance depend on resin selection and formulation.
Mechanical qualification should therefore use the complete cured system rather than neat hardener data.

MODULUS CONTROL

Current product positioning includes improved modulus performance.
In a flexible epoxy system, useful modulus means maintaining sufficient load-bearing stiffness while avoiding brittle behavior.
ARADUR 70 can help tune the mechanical balance between a rigid epoxy resin and a highly flexible cured network.
The exact modulus is controlled by resin functionality, stoichiometry, fillers and cure.
Mineral fillers usually increase stiffness while flexible resin modifiers or polyether-rich components reduce it.
The formulation should be optimized to the intended movement and load requirements.

TEMPERATURE RESISTANCE

Temperature resistance is included among the current product features.
For ARADUR 70, temperature performance should be interpreted in the context of a flexible low-Tg epoxy network.
The key advantage is not unusually high heat distortion but retention of useful mechanical behavior across changing temperatures, especially toward the cold side.
Elevated-temperature service can soften a flexible network more strongly than a rigid high-Tg epoxy.
Thermal resistance should therefore be established using the actual service temperature range and mechanical load.
Heat aging and thermal cycling are useful qualification methods.

APPLICATIONS

Flexible binder systems
Flexible binder systems are a principal current application. ARADUR 70 chemically incorporates flexible segments into the epoxy network and reduces dependence on mobile external plasticizers.

Impact-resistant coatings
Impact-resistant coatings are a principal current end use. Flexible cure helps films tolerate shock and deformation without brittle cracking.

Elastomeric sealants
Elastomeric sealants are a current end use. ARADUR 70 can be used in epoxy sealant systems that require permanent flexibility and adhesion.

Flexible sealers
Sealers can use ARADUR 70 where movement tolerance and low-temperature flexibility are important.

Film adhesives
Film adhesive is a current product end use. Flexible cure can reduce stress concentration in bonded assemblies and improve resistance to peel or vibration.

Flexible structural adhesives
Selected structural and semi-structural adhesives can use ARADUR 70 where strain tolerance is more important than maximum rigid modulus.

Metal bonding
Prepared steel and aluminum can be bonded with compatible ARADUR 70 epoxy systems where flexibility helps accommodate differential thermal expansion.

Concrete-to-metal bonding
Flexible adhesive systems can reduce stress at interfaces between mineral and metallic substrates with different stiffness or thermal movement.

Concrete coatings
Concrete surfaces can use flexible coatings where crack-bridging tendency, movement tolerance and impact resistance are required.

Flexible floor coatings
Floors exposed to vibration, impact or thermal movement can use compatible ARADUR 70 binder systems.

Anti-slip floor coatings
Aggregate-broadcast floor systems can use flexible epoxy binders that tolerate impact and deformation better than highly brittle coatings.

Ramps and walkways
Service areas exposed to wheeled traffic, shock and repeated loading can benefit from increased impact tolerance.

Cold-storage floors
Low-temperature flexibility makes ARADUR 70 relevant to cold-storage and refrigerated environments where conventional rigid epoxy can become brittle.

Freezer-area coatings
Flexible epoxy can be considered for selected low-temperature floors, equipment and surfaces after qualification at the minimum operating temperature.

Flexible membranes
ARADUR 70 can be formulated into epoxy membrane systems where movement tolerance is required.

Protective membranes
Flexible membranes can protect substrates while tolerating limited deformation or vibration.

Base coats
Base coat is a current product end use. Flexible base coats can reduce stress transfer between a substrate and later coating layers.

Tank linings
Tank lining is a current end use. Flexible epoxy linings can be useful where thermal cycling or substrate movement is expected, subject to chemical-
resistance testing.

Potting compounds
Potting compounds are a current end use. Flexible potting can protect electrical or mechanical components from impact, vibration and thermal stress.

Flexible encapsulation
Encapsulation systems can use ARADUR 70 to reduce stress on embedded components during temperature cycling.

Insulators
Insulator applications are included in current end-use positioning. Flexible epoxy can help reduce cracking around rigid inserts or during thermal cycling.

Electrical potting
Selected electrical assemblies can use flexible epoxy potting where dielectric, thermal and mechanical properties are validated.

Prepreg systems
Prepreg is a current end-use category. ARADUR 70 may be used in specialized flexible or toughened epoxy formulations where the cure schedule and storage 
stability are appropriate.

Powder coating systems
Powder coating appears in current product end-use listings, but any use must be based on a validated formulated system because ARADUR 70 itself is a viscous 
liquid curing agent.

Flexible repair compounds
Repair materials can use ARADUR 70 where movement, vibration or impact would cause a conventional rigid repair to crack.

Joint-adjacent repairs
Repairs near movement zones can benefit from increased binder flexibility, although true movement joints still require dedicated joint design.

Ceramic-filled repair systems
Hard fillers can be combined with ARADUR 70 to balance abrasion resistance with improved impact tolerance.

Abrasion-resistant flexible compounds
Mineral-filled binders can use the hardener where both wear resistance and deformation tolerance are needed.

Vibration-resistant coatings
Equipment and structures exposed to vibration can use flexible coatings that reduce brittle fatigue cracking.

Machinery coatings
Machine frames and equipment can use impact-tolerant coatings where mechanical shock is expected.

Transportation coatings
Flexible epoxy can be evaluated on components exposed to vibration and thermal cycling, subject to application-specific qualification.

Composite bonding
Flexible adhesive systems can reduce stress concentrations between composite and metallic parts.

Wood bonding
ARADUR 70 can be evaluated in flexible epoxy adhesives for wood where movement associated with moisture or temperature requires strain tolerance.

Composite repair
Selected repair systems can use flexible epoxy to improve impact tolerance and reduce brittle crack propagation.

Sealing compounds
Flexible sealing materials can use ARADUR 70 where permanent deformation tolerance and adhesion are required.

Crack-tolerant coatings
ARADUR 70 can help formulate coatings that tolerate limited substrate movement better than rigid epoxy systems.

Thermal-cycling systems
Applications that repeatedly cycle between warm and cold conditions can benefit from retained low-temperature elongation.

Fatigue-resistant adhesive joints
Flexible cure can reduce peak stress under repeated cyclic loading and improve fatigue tolerance in selected bonded assemblies.

Impact-resistant flooring
Factories and workshops exposed to dropped tools or mechanical shock can use flexible binder systems where surface hardness remains adequate.

Broadcast flooring
Quartz or aggregate can be broadcast into a flexible base layer to combine grip with impact resistance.

Flexible mastics
Thixotropic mastics can use ARADUR 70 when non-sag rheology is added to the high-viscosity binder system.

Flexible grouts
Selected grouts can use flexible epoxy where vibration or differential movement makes very rigid grout undesirable.

Machine-isolation compounds
Flexible epoxy can be evaluated where vibration damping and bonded support are required.

Low-temperature adhesives
Adhesive joints operating below room temperature can benefit from the retained flexibility of ARADUR 70.

Cold-climate protective systems
Outdoor or refrigerated service can use compatible flexible coatings where low-temperature cracking is a concern.

General flexible epoxy systems
Other applications are possible where permanent flexibility, impact resistance and low-temperature elongation are more important than very high rigid-system 
Tg.

BISPHENOL A EPOXY RESIN COMPATIBILITY

Current product information states that ARADUR 70 can be formulated with modified or unmodified bisphenol A-based liquid epoxy resins.
Unmodified bisphenol A resin provides a conventional epoxy backbone with good adhesion and chemical resistance but is normally rigid when cured with conventional hardeners.
ARADUR 70 introduces flexible segments that reduce brittleness and increase elongation.
Modified bisphenol A resins can further adjust viscosity, toughness or reactivity.
Because ARADUR 70 has a very high AHEW, the required hardener quantity is large and can dominate the flexible character of the final network.
The exact ratio should be taken from current resin-specific guidance.

BISPHENOL F EPOXY RESIN COMPATIBILITY

Current product information also states that ARADUR 70 is compatible with suitable bisphenol F-based liquid epoxy resins.
Bisphenol F resin can provide lower viscosity than standard bisphenol A resin at comparable functionality.
This can help compensate for the high viscosity of ARADUR 70 in solvent-free or high-solids flexible systems.
The resin EEW must be known because the theoretical hardener demand changes with epoxy functionality.
Final flexibility, modulus and chemical resistance should be tested because the resin structure strongly affects the cured network.

REACTIVE DILUENTS

Reactive epoxy diluents can be used to reduce processing viscosity when compatible with ARADUR 70.
Unlike conventional solvent, a reactive diluent becomes part of the cured network.
Reactive diluent changes the overall epoxy equivalent weight and therefore changes stoichiometric hardener demand.
Monofunctional diluents can reduce crosslink density and may increase flexibility but can also reduce chemical or thermal resistance.
Multifunctional diluents can lower viscosity while preserving more network density.
Every reactive-diluent change should therefore trigger recalculation of the effective EEW and revalidation of cure and mechanical properties.

EXTERNAL PLASTICIZER COMPARISON

ARADUR 70 is specifically valuable because its flexibility is reactive and structurally incorporated.
An externally plasticized epoxy contains a separate mobile material that softens the network without becoming fully covalently attached.
External plasticizer can migrate to the surface, be extracted by solvents or oils or redistribute during aging.
That migration can change hardness, adhesion, surface appearance and low-temperature behavior.
ARADUR 70 minimizes dependence on this mechanism by incorporating flexible polyether urethane segments through cure.
The result is better retention of flexibility over time and at low temperature in properly formulated systems.

FILLERS AND AGGREGATES

ARADUR 70 can be combined with silica, quartz, calcium carbonate and other compatible mineral fillers.
Filler loading can increase hardness, modulus, abrasion resistance and dimensional stability.
The very high hardener viscosity means filler addition can raise formulation viscosity rapidly.
Particle-size distribution should therefore be optimized to reduce binder demand and maintain processability.
Rigid filler generally reduces ultimate elongation, so highly flexible applications should avoid excessive mineral loading.
Filled systems should be tested for impact, elongation and crack resistance rather than assuming neat-binder flexibility will remain unchanged.

PIGMENTS

Compatible pigments can be incorporated into ARADUR 70 coating systems.
Pigment selection should consider amine compatibility, dispersion requirements and the desired flexible-film properties.
Very high pigment volume can make a coating more brittle because the continuous flexible polymer fraction is reduced.
Dense pigments can also affect settling and application rheology.
The final formulation should be evaluated for color stability, cure, adhesion and flexibility after pigment addition.

RHEOLOGY CONTROL

ARADUR 70 is already highly viscous, so rheology design differs from that of very low-viscosity amine hardeners.
Some coating and adhesive systems may require viscosity reduction rather than additional thickening.
Vertical mastics or sealants can still require thixotropy to prevent slump.
Fumed silica, organoclays or polymeric rheology modifiers can be evaluated where compatible.
Excessive thixotrope can reduce flow and create mixing difficulty.
Processing viscosity should be measured after all resin, fillers and additives are included.

MIXING

The viscosity difference between ARADUR 70 and many liquid epoxy resins can make mixing more demanding than in conventional low-viscosity systems.
Both components should be conditioned to a suitable common processing temperature before mixing.
High-shear mixing can improve homogeneity but can also entrain air.
Scraping the vessel walls and bottom is important because unmixed high-viscosity hardener can remain in dead zones.
For filled systems, the resin and hardener should be homogenized before large quantities of aggregate are introduced unless the validated process specifies otherwise.
Incomplete mixing can cause local soft spots, tackiness or uneven flexibility.

DEFOAMING AND AIR RELEASE

High viscosity can trap air introduced during mixing.
Entrained bubbles can reduce mechanical strength and create pinholes or voids in coatings, potting compounds and adhesives.
Vacuum deaeration can be useful in suitable casting or potting processes.
Compatible defoamers can help coating systems, but excessive dosage can reduce intercoat adhesion or create craters.
Warming within the approved processing range can reduce viscosity and improve air release.
The process should avoid uncontrolled heating because of fire, degradation and cure-rate concerns.

POT LIFE

ARADUR 70 has a long standardized gel time compared with many ordinary epoxy hardeners.
The 300-500 minute selector range does not mean every ARADUR 70 formulation will remain fully usable for that entire period.
Resin type, temperature, batch size, reactive diluent and accelerator can change the practical window substantially.
Large mixed masses can self-heat and shorten pot life.
A coating or adhesive can also lose optimum application rheology before formal gelation.
Practical pot life should therefore be measured on the exact final formulation.

EXOTHERM CONTROL

Epoxy-amine cure is exothermic even when the curing agent is relatively slow.
The large hardener mass used with ARADUR 70 can create substantial total reactive material in a batch.
Large mixed masses can retain heat and cure faster internally than thin applied layers.
Potting and casting sections require particular attention to peak exotherm.
Fillers can reduce peak temperature by absorbing heat and lowering the fraction of reactive binder.
Batch size and section thickness should be validated before scale-up.

AMBIENT AND ELEVATED-TEMPERATURE CURE

ARADUR 70 can be used in ambient-temperature cure or in controlled elevated-temperature cure schedules according to formulation.
Ambient cure is useful in coatings, sealers and field-applied adhesives.
Moderate post-cure can be used where improved final conversion or mechanical properties are desired.
Heating accelerates cure but can also lower viscosity and increase bubble movement or exotherm.
The cure schedule should therefore be established for the complete resin-hardener system rather than selected from generic epoxy practice.

TEMPERATURE EFFECTS

Low processing temperature increases ARADUR 70 viscosity and can make dispensing or mixing difficult.
Higher temperature lowers viscosity but accelerates reaction once epoxy resin is added.
The product should be allowed to equilibrate to a controlled processing temperature before use.
Open flames or uncontrolled heaters should never be used for warming.
Service temperature also affects mechanical behavior because ARADUR 70 is intentionally designed around a flexible low-Tg network.
Performance should be evaluated at both minimum and maximum expected temperatures.

ADHESION

ARADUR 70 can provide good adhesion to properly prepared compatible substrates.
Flexible networks reduce stress concentration at the interface and can be advantageous where the bonded materials move differently.
Concrete should be sound and free from weak laitance, oil and dust.
Steel should be clean and free from salts, oil, rust and loose scale.
Wood and composite surfaces require substrate-specific preparation.
Adhesion should be tested after full cure and after relevant thermal, moisture or fatigue exposure.

CONCRETE SURFACES

Concrete is included among current material-compatibility categories.
Flexible epoxy coatings or sealers can tolerate limited substrate strain better than rigid systems.
Concrete should be mechanically sound and properly prepared before application.
Moisture condition should be assessed because water resistance and adhesion depend on the complete formulation.
Very flexible coatings are not a substitute for structural crack repair.
Cracks and movement joints should be evaluated separately.

STEEL AND METAL SUBSTRATES

Steel and metal are included among current material-compatibility categories.
Flexible epoxy can reduce stress generated by thermal expansion or impact on metallic substrates.
Steel should be free from oil, salts, rust and weak scale.
Abrasive blasting is often appropriate for demanding protective service.
Flexible coatings can be especially useful on vibrating equipment or thin metal sections that deform slightly in service.
Corrosion protection still depends on primer design, film thickness and pigment package.

IMPACT-RESISTANT COATINGS

Impact-resistant coatings are one of the most important ARADUR 70 applications.
A rigid epoxy coating can crack when a substrate dents or when a heavy object strikes the surface.
ARADUR 70 allows the cured film to absorb more deformation before failure.
The degree of improvement depends on coating thickness, substrate stiffness and the amount of flexible hardener used.
Hard fillers can increase abrasion resistance but should be balanced against loss of elongation.
Impact testing should be performed on the finished coating system.

ELASTOMERIC SEALANTS

Elastomeric sealants are included in current product end-use positioning.
An epoxy-based sealant can provide strong adhesion and chemical resistance while ARADUR 70 contributes movement tolerance.
The system should be designed for the required joint movement rather than assuming every flexible epoxy behaves like a conventional elastomeric joint sealant.
Adhesion to joint faces, cohesive strength, recovery and low-temperature behavior should be tested.
Fillers and thixotropes can be used to create a non-sag paste consistency.
Movement joints with large cyclic displacement may still require dedicated sealant technology.

FILM ADHESIVES

Film adhesive is a current end-use category for ARADUR 70.
Flexible cure can improve peel tolerance and reduce stress concentration in bonded laminates.
The product can be useful where bonded parts experience vibration, impact or different thermal expansion.
Film adhesive systems require careful control of resin content, reinforcement or carrier, storage stability and cure schedule.
The final adhesive should be tested for shear, peel, fatigue and environmental durability.

POTTING COMPOUNDS

Potting compound is a current product end use.
Flexible epoxy potting can reduce mechanical stress on components, wires and inserts during thermal cycling.
ARADUR 70 can be useful where a rigid encapsulant would crack or transmit excessive stress.
High viscosity can make bubble removal more difficult, so vacuum processing or controlled warming may be useful where appropriate.
Deep potting masses require exotherm testing.
Electrical and thermal properties should be established for the complete formulation.

TANK LININGS

Tank lining is included among current product end uses.
A flexible lining can better tolerate substrate movement and thermal cycling than a very brittle coating.
Chemical resistance remains highly formulation dependent because increasing flexibility can reduce crosslink density.
The actual stored chemical, concentration, temperature and immersion duration should be used for qualification.
Tank-lining use should never be inferred solely from generic chemical-resistance positioning.

POWDER COATING POSITIONING

Powder coating appears among current product end-use categories.
ARADUR 70 itself is a high-viscosity liquid curing agent, so any powder-coating use must involve a specifically formulated or processed system rather than direct addition in ordinary liquid form.
The product can contribute flexibility or impact modification where compatible with the powder formulation route.
Processing, storage stability and cure behavior should be validated for the exact powder technology.
No generic powder-coating recipe should be inferred from the current end-use tag alone.

PREPREG POSITIONING

Prepreg is included among current product end-use categories.
Flexible epoxy cure can be valuable in composite systems that need improved impact tolerance or strain capability.
Prepreg technology requires tightly controlled resin advancement, tack, storage stability and cure schedule.
ARADUR 70 use in prepreg should therefore be based on a dedicated validated resin system rather than generic ambient-cure assumptions.
Composite performance should be tested for tensile, interlaminar, fatigue and impact behavior.

CHEMICAL RESISTANCE

Chemical resistance is included among current product features.
The final resistance profile depends strongly on the resin backbone, hardener ratio, cure completeness and flexible-network crosslink density.
Increasing flexibility generally lowers network rigidity and can change solvent uptake relative to a highly crosslinked rigid epoxy.
Water, oils, cleaners and selected industrial chemicals can be tolerated by appropriate formulations.
Aggressive solvents, strong acids, oxidizers and hot immersion require dedicated testing.
No blanket chemical-resistance statement should replace service-specific qualification.

WATER RESISTANCE

Water resistance is formulation dependent.
The flexible polyether-rich structure can interact differently with moisture than a rigid high-crosslink-density epoxy.
Resin selection and cure completeness are therefore important.
Early water exposure should be avoided unless the system is specifically qualified for it.
Continuous immersion and repeated wet-dry cycling should be tested separately.
Adhesion after water exposure is an important qualification parameter.

FATIGUE AND VIBRATION

ARADUR 70 is particularly relevant to systems exposed to fatigue and vibration.
A flexible bond line can distribute cyclic strain over a larger volume and reduce peak stress.
This can delay crack initiation compared with a very brittle adhesive or coating.
The benefit depends on joint geometry, substrate stiffness and cured modulus.
Long-term cyclic testing is useful for machinery, transportation and composite-bonding applications.
Permanent flexibility helps maintain this benefit over repeated service cycles.

THERMAL CYCLING

Thermal cycling creates repeated expansion and contraction of bonded or coated substrates.
Different materials can have very different coefficients of thermal expansion.
A rigid epoxy network can concentrate stress at interfaces during repeated temperature change.
ARADUR 70 can reduce this stress by providing a more deformable cured network.
Low-temperature elongation is particularly valuable when a system cools below normal room temperature.
Qualification should reproduce the actual minimum and maximum service temperatures and cycle count.

QUALITY CONTROL

Important ARADUR 70 quality-control parameters include appearance, viscosity, amine value, AHEW, density, color and functional cure behavior.
Current selector values are approximately 16,000-27,000 mPa·s viscosity at 25°C, 65-75 mg KOH/g amine value, approximately 900 g/eq AHEW, approximately 300-500 minutes reference gel time and Gardner color ≤5.
Published density is approximately 1.02 g/cm³.
A standardized resin cure test can confirm the expected long-gel flexible-hardener profile.
Batch COA values should take precedence for incoming acceptance where supplied.
Mechanical validation should include elongation and impact performance when permanent flexibility is a critical specification.

WHY VISCOSITY MATTERS

The 16,000-27,000 mPa·s viscosity range makes ARADUR 70 fundamentally different to process from low-viscosity hardeners.
High viscosity affects pump size, transfer pressure, mixing power and deaeration.
Unexpectedly high viscosity can indicate low temperature, aging or contamination.
Unexpectedly low viscosity can indicate dilution, excessive temperature or incorrect material.
Viscosity should be measured at the specified temperature and interpreted together with density and amine value.

WHY AHEW MATTERS

The approximately 900 g/eq AHEW explains the unusually high hardener loading required with conventional epoxy resins.
AHEW must be paired with resin EEW to calculate theoretical stoichiometry.
Using the AHEW of ARADUR 75-1, ARADUR 76 or an ordinary polyamine would create a major formulation error.
The high AHEW also reflects the large flexible organic structure per reactive amine hydrogen.
This structural mass is central to the exceptional elongation and low-temperature flexibility.

WHY GEL TIME MATTERS

The 300-500 minute selector gel-time range indicates a long standardized working period relative to many ambient amine hardeners.
Long gel time can be useful for large flexible coatings, adhesive assemblies and potting operations.
Actual pot life can nevertheless differ substantially because resin choice, accelerator level and temperature alter reactivity.
The current product feature list includes fast-cure positioning, reinforcing the need to rely on the exact formulation rather than one selector result alone.
Practical processing time should therefore be measured directly for every production system.

BENZYL ALCOHOL STATUS

Current selector literature marks ARADUR 70 as benzyl-alcohol-free.
This is useful where benzyl alcohol migration, emissions or water-sensitivity concerns are relevant to formulation design.
The complete resin system should still be reviewed because other formulation components can introduce benzyl alcohol or other volatile substances.
Formal declarations should rely on current product-specific compliance documentation.

SVHC-CHEMICALS-FREE CLAIM

Current product labeling identifies ARADUR 70 as Substances of Very High Concern chemicals-free.
Formal use of this claim should rely on current product-specific regulatory documentation because candidate lists can change.
The finished coating, adhesive or potting compound must be assessed separately because other raw materials may introduce substances not present in the hardener.
The claim does not by itself establish regulatory approval for a specialized end use.

TDS, SDS AND COA

The current product-specific Technical Data Sheet should control present specifications, resin compatibility and validated formulation recommendations.
The Safety Data Sheet governs formal component disclosure, hazards, first aid, firefighting, transport, storage and disposal.
The Certificate of Analysis provides batch-specific controlled values where supplied.
Current selector literature supports the polyether urethane amine identity, 16,000-27,000 mPa·s viscosity, 65-75 mg KOH/g amine value, approximately 900 g/eq AHEW, 300-500 minute gel-time range, Gardner ≤5 and benzyl-alcohol-free status.
Published safety-property data support density around 1.02 g/cm³, flash point around 65°C, boiling point around 120°C, ignition temperature at least approximately 300°C and water insolubility.
Where current product-specific documentation differs from selector or historical information, the current product-specific document should take precedence.

SAFETY AND HANDLING

ARADUR 70 is a reactive amine-containing curing agent and should be handled according to the current product-specific SDS.
Chemical-resistant gloves, protective clothing and tightly fitting chemical safety goggles should be used.
A face shield is appropriate where splashing or pressurized transfer can occur.
Direct contact with skin, eyes and clothing should be avoided.
Vapors, aerosols and mists should not be inhaled.
General ventilation and local exhaust should be provided where transfer, mixing or application can generate airborne exposure.

FIRST AID

After inhalation exposure, move the affected person to fresh air and obtain medical attention if coughing, wheezing, dizziness, chest discomfort or breathing difficulty occurs.
After skin contact, remove contaminated clothing and wash the affected area thoroughly with soap and plenty of water.
After eye contact, rinse cautiously with clean running water for at least 10-15 minutes and obtain prompt medical attention.
After accidental ingestion, rinse the mouth and follow the current product-specific SDS and professional medical guidance.
Generic home treatment should not replace current SDS instructions for a proprietary reactive amine mixture.

SPILL MANAGEMENT

ARADUR 70 is a high-viscosity liquid and spilled material can create a slippery surface.
Unnecessary personnel should be kept away and the area should be ventilated.
Suitable chemical-resistant PPE should be worn before cleanup.
Sand, earth, vermiculite or another compatible non-combustible absorbent can be used where appropriate.
The product should be prevented from entering drains, sewers, soil, groundwater and natural waterways.
Recovered product and contaminated absorbent should be placed in correctly labeled recovery or waste containers.

FIRE RESPONSE

ARADUR 70 has a published flash point around 65°C by closed-cup testing.
The product can burn or decompose under severe heating.
Ignition sources should be controlled during storage and processing.
Thermal decomposition can generate hazardous fumes and smoke.
Firefighters may require self-contained breathing apparatus and appropriate protective clothing.
Extinguishing media and emergency procedures should follow the current product-specific SDS and facility fire plan.

STORAGE

ARADUR 70 should be stored in its tightly closed original container.
The storage area should be cool, dry and well ventilated.
The product should be protected from moisture, atmospheric carbon dioxide, direct sunlight and contamination.
Storage near strong acids, strong oxidizing agents and incompatible reactive chemicals should be avoided.
Low temperature can increase viscosity, so the material should be allowed to reach a suitable processing temperature before use.
The exact approved storage-temperature range and shelf life should be taken from the current product-specific documentation and original-container expiry information.

REGULATORY CONSIDERATIONS

ARADUR 70 is a proprietary polyether urethane amine curing agent used in industrial epoxy systems.
Current product labeling identifies the grade as Substances of Very High Concern chemicals-free.
Published current regulatory data list multiple chemical-inventory entries, but regional compliance should always be confirmed from current product-specific documentation for the intended market.
Generic suitability for coatings, sealants, potting, prepregs or tank linings does not establish approval for food contact, potable water, medical devices or other specialized regulated uses.
The finished formulation must be assessed separately because regulatory status depends on every component.

ENVIRONMENTAL CONSIDERATIONS

ARADUR 70 is insoluble in water according to published safety-property data and should not be discharged to drains or natural waterways.
Uncured reactive amine can harm the environment and should be contained during spills and cleanup.
Cleaning waste can contain resin, hardener, pigments, fillers and cleaning media and should be managed appropriately.
Large masses of mixed resin and hardener can generate heat during cure and should not be accumulated in uncontrolled waste containers.
Fully cured epoxy has different mobility and reactivity from uncured components, but disposal requirements remain jurisdiction-specific.

COMMON FORMULATION PROBLEMS

Mixture is too viscous to process
ARADUR 70 is inherently high in viscosity. Condition components to an approved processing temperature, consider compatible low-viscosity resin or reactive diluent and avoid uncontrolled heating.

Incomplete mixing
Large viscosity differences between resin and hardener can leave unmixed zones. Use adequate mixing power and scrape vessel walls and bottom thoroughly.

Air entrapment
High viscosity can trap bubbles introduced during mixing. Reduce mixing air, use vacuum deaeration where appropriate or optimize processing temperature.

Potting compound contains voids
Entrained air or excessive exotherm can create voids. Improve deaeration, reduce batch size and validate the cure schedule.

Coating is too soft
Excessive hardener, low-crosslink-density resin or incomplete cure can produce insufficient hardness. Verify ratio and full cure before changing the 
formulation.

Coating is too rigid
Too little ARADUR 70, excessive rigid filler or a highly functional resin can suppress flexibility. Rebalance the system and test elongation.

Poor low-temperature flexibility
Incorrect resin ratio, excessive filler or incomplete incorporation can reduce the expected cold flexibility. Test the complete system at the target low temperature.

Poor impact resistance
The formulation may be too rigid or too thin. Review hardener ratio, resin type, film build and filler content.

Poor adhesion
Oil, dust, weak concrete, salts or inadequate metal preparation can prevent bonding. Correct the substrate before changing hardener chemistry.

Long cure time
ARADUR 70 has a long standardized gel time. Low temperature or an unaccelerated resin can extend cure further. Use the validated cure schedule rather than adding arbitrary accelerator.

Unexpectedly short pot life
High temperature, large mixed mass or added accelerator can shorten the working period. Reduce batch size and control temperature.

Excessive exotherm
Large mixed masses can retain reaction heat. Reduce batch size, use fillers where appropriate and validate thick sections separately.

Low chemical resistance
Very flexible networks can have different solvent uptake from rigid high-crosslink-density epoxies. Optimize resin selection and test the actual service 
chemical.

Filler makes system brittle
High rigid-filler loading can reduce elongation. Lower filler volume or use a more suitable particle-size distribution.

Sealant sags
Flexible binder may need compatible thixotropy for vertical joints. Add controlled rheology without eliminating movement capability.

Film yellows outdoors
Conventional epoxy resin can yellow under ultraviolet exposure even when the flexible hardener remains functional. Use a suitable exterior finish where 
appearance matters.

Water exposure reduces properties
Water resistance is formulation dependent. Improve cure completeness, resin choice and service qualification.

Incorrect ratio from conventional amine assumptions
ARADUR 70 has an AHEW near 900 g/eq and requires far more hardener than ordinary amines. Use the actual AHEW and resin EEW.

Confusion between 400 phr and theoretical stoichiometry
A published selector lists approximately 400 phr while a simple EEW 190 / AHEW 900 calculation gives about 474 phr. Follow the validated resin-specific 
ratio rather than forcing one value universally.

Flexibility declines after formulation change
Rigid resin, multifunctional reactive diluent or high filler loading can reduce elongation. Revalidate the complete mechanical-property balance.

FREQUENTLY ASKED QUESTIONS

What is ARADUR 70?
ARADUR 70 is a high-viscosity polyether urethane amine epoxy curing agent designed for permanently flexible epoxy systems.

What is the viscosity?
Current selector data give approximately 16,000-27,000 mPa·s at 25°C.

What is the amine value?
Approximately 65-75 mg KOH/g.

What is the active hydrogen equivalent weight?
Approximately 900 g/eq.

What is the reference gel time?
Approximately 300-500 minutes with ARALDITE GY 250 in current selector literature.

What is the Gardner color?
Approximately ≤5.

What is the density?
Approximately 1.02 g/cm³ at about 20-25°C.

What is the flash point?
Approximately 65°C by Pensky-Martens closed-cup testing.

Is ARADUR 70 water soluble?
Published safety-property data describe ARADUR 70 as insoluble in water.

What is the main advantage of ARADUR 70?
Its defining advantage is permanent chemically incorporated flexibility together with impact resistance and retained low-temperature elongation.

How much elongation can ARADUR 70 provide?
Published reference-system data report maximum elongation around 350% at 23°C and greater than about 250% at -10°C.

What is the reference Tg range?
Published flexible-hardener selector data give a Tg range below approximately -10°C.

Is the flexibility based on an external plasticizer?
No. ARADUR 70 is designed to provide reactive, internally incorporated flexibility rather than depending only on a migrating external plasticizer.

Which epoxy resins can be used with ARADUR 70?
Current product information supports modified or unmodified bisphenol A-based liquid epoxy resins and compatible bisphenol F-based liquid epoxy resins.

What are the main current end uses?
Flexible binders, impact-resistant coatings, sealers, elastomeric sealants, film adhesives, potting compounds, insulators, prepregs, powder-coating systems and tank linings are among the current end-use categories.

Can ARADUR 70 be used for impact-resistant coatings?
Yes. Impact-resistant coatings are one of the principal current applications.

Can ARADUR 70 be used for sealants?
Yes. Flexible sealers and elastomeric sealants are important applications.

Can ARADUR 70 be used for adhesives?
Yes. Flexible and film-adhesive systems can use ARADUR 70 where strain tolerance is important.

Can ARADUR 70 be used for potting?
Yes. Potting compound is a current end-use category, especially where vibration and thermal-stress tolerance are needed.

Can ARADUR 70 be used on concrete?
Yes. Concrete surface is included among current material-compatibility categories when the complete formulation and substrate preparation are suitable.

Can ARADUR 70 be used on steel?
Yes. Steel and metal substrates are included among current compatibility categories.

Why is the mix ratio so high?
ARADUR 70 has a very high AHEW of approximately 900 g/eq, so a large mass of hardener is required to provide the necessary reactive equivalents.

What is the theoretical ratio with an epoxy resin EEW of 190?
Approximately 474 parts ARADUR 70 per 100 parts resin by simple theoretical stoichiometry.

Why does one selector show about 400 phr?
A published high-performance selector gives a typical reference ratio around 400 phr. Practical validated formulation ratios can differ from simple theoretical stoichiometry because of the exact resin and system design.

Is ARADUR 70 benzyl-alcohol-free?
Current selector literature marks ARADUR 70 as benzyl-alcohol-free.

Is ARADUR 70 SVHC-chemicals-free?
Current product labeling identifies the grade as Substances of Very High Concern chemicals-free.

Does ARADUR 70 have one universal CAS number?
No. It is a proprietary formulated mixture and should not be assigned one universal CAS number without the current product-specific SDS.

How should ARADUR 70 be stored?
Keep it in the tightly closed original container in a cool, dry and well-ventilated location, protect it from moisture, carbon dioxide, sunlight and contamination, and follow current product-specific storage documentation.

What documents should be checked before use?
Use the current product TDS, SDS and batch-specific COA or quality documentation where available.

FINAL TECHNICAL SUMMARY

ARADUR 70 is a high-viscosity polyether urethane amine epoxy curing agent designed for permanently flexible, impact-resistant and low-temperature-tolerant epoxy systems.
Current selector data specify approximately 16,000-27,000 mPa·s viscosity at 25°C, 65-75 mg KOH/g amine value, approximately 900 g/eq active-hydrogen equivalent weight, approximately 300-500 minutes reference gel time and Gardner color ≤5.

Published safety-property data give density around 1.02 g/cm³, flash point around 65°C, boiling point around 120°C, ignition temperature at least approximately 300°C and water insolubility.
The defining technical advantage is permanent flexibility created through chemically incorporated polyether urethane segments rather than reliance on migrating external plasticizer.
Published reference-system data report elongation around 350% at 23°C and greater than approximately 250% at -10°C, together with a Tg range below approximately -10°C.
These characteristics make ARADUR 70 particularly useful in flexible binder systems, impact-resistant coatings, sealers, adhesives, potting compounds and applications exposed to vibration, thermal cycling or low temperatures.

Current end-use positioning also includes base coats, elastomeric sealants, film adhesives, insulators, powder-coating systems, prepregs and tank linings.
Concrete surfaces, steel substrates and metal substrates are included among current material-compatibility categories.
ARADUR 70 can be formulated with modified or unmodified bisphenol A-based liquid epoxy resins and compatible bisphenol F-based liquid epoxy resins.
The very high AHEW means the hardener is used at unusually high weight levels relative to ordinary amines.
A simple theoretical calculation with epoxy resin EEW around 190 g/eq gives approximately 474 parts ARADUR 70 per 100 parts resin, while a published selector lists a typical reference ratio around 400 phr.

The difference confirms that current resin-specific validated formulation data should control production use rather than one universal assumed ratio.
The high 16,000-27,000 mPa·s viscosity requires appropriate pumping, mixing and deaeration strategies.
Reactive diluents can reduce processing viscosity but also change epoxy equivalent weight and must be included in stoichiometric calculations.
Mineral fillers can increase stiffness and abrasion resistance but generally reduce ultimate elongation if used at high levels.
The long standardized gel time provides a useful working window, but practical cure remains strongly formulation- and temperature-dependent.
Current selector literature marks ARADUR 70 as benzyl-alcohol-free, while current product labeling identifies the grade as Substances of Very High Concern chemicals-free.
ARADUR 70 is a proprietary formulated curing agent and should not be assigned an invented single molecular formula, molecular weight, CAS number or EC number.

For ARADUR 70 technical specifications, application guidance, TDS, SDS, COA and formulation support, contact Ataman Chemicals with the intended epoxy resin, target flexibility, service temperature, filler level, batch size and required mechanical performance.

Ataman Chemicals
Phone: +90 216 577 10 10
Email: info@atamankimya.com