PRODUCTS

ARADUR 460 J 90

ARADUR 460 J 90 is a modified ethanol-containing polyamidoamine-adduct epoxy curing agent developed for high-solids coatings, epoxy mortars, concrete adhesives, marine finishes and wet-condition protective systems.
Current product information specifies approximately 2,500-5,500 mPa·s viscosity at 25°C, 240-270 mg KOH/g amine value, approximately 0.98 g/cm³ density at 20°C, a flash point around 35°C and a reference gel time around 100 minutes with ARALDITE GY 250.

ARADUR 460 J 90 is a modified ethanol-containing polyamidoamine-adduct epoxy curing agent developed for high-solids coatings, epoxy mortars, concrete adhesives, marine finishes and heavy-duty protective systems that must cure reliably under very humid, wet or difficult-to-wet conditions. The commercial grade combines polyamidoamine adhesion and flexibility with pre-adduct modification and ethanol-assisted processing, giving approximately 2,500-5,500 mPa·s viscosity at 25°C, 240-270 mg KOH/g amine value, an active-hydrogen equivalent weight of approximately 190 g/eq, density around 0.98 g/cm³ and a reference gel time of approximately 100 minutes with ARALDITE GY 250. ARADUR 460 J 90 is especially valuable where excellent adhesion to wet concrete or sand-blasted steel, smooth high-gloss film formation, strong anti-corrosion performance and underwater or extreme-humidity application are required.

PRODUCT IDENTITY

Product name: ARADUR 460 J 90
Product type: Epoxy curing agent / hardener
Chemical family: Polyamidoamine
Specific chemistry: Modified polyamidoamine adduct
Carrier solvent: Ethanol
Physical form: Liquid
Appearance: Clear liquid
SDS color description: Brown yellow
General color range: Yellowish to brownish
Occasional color effect: A greenish appearance can sometimes occur without necessarily reducing technical performance
Odor: Amine-like
Viscosity at 25°C: Approximately 2,500-5,500 mPa·s in current product data
Historical selector viscosity range: Approximately 1,800-5,500 mPa·s
Amine value: Approximately 240-270 mg KOH/g
Active hydrogen equivalent weight: Approximately 190 g/eq
Density at 20°C: Approximately 0.98 g/cm³
Flash point: Approximately 35°C by Pensky-Martens closed-cup testing
Reference gel time: Approximately 100 minutes at 23°C, 250 g mass, with ARALDITE GY 250
Reference mix ratio with ARALDITE GY 250: Approximately 100:100 parts by weight resin to hardener
Compatible liquid epoxy-resin examples: ARALDITE GY 250, ARALDITE GY 764 and ARALDITE GY 783
Primary functions: Curing agent and hardener
Primary current end uses: Concrete adhesives and marine finishes
Primary application positioning: High-solids coatings, epoxy mortars, concrete adhesives, extreme-humidity systems and underwater coatings
Current product features: Corrosion resistance, enhanced surface smoothness, excellent adhesion and high gloss
Wet-condition performance: Extreme compatibility under wet conditions
Substrate adhesion: Very good adhesion to wet concrete and sand-blasted steel
Surface cure: Smooth, glossy and non-tacky cured films or coatings
Anti-corrosion performance: High degree of anti-corrosion protection in suitable epoxy systems
Concrete bonding function: Adhesive agent between old and fresh concrete
Application condition: Suitable for wet, damp and difficult-to-wet substrates when the complete system is formulated correctly
Historical selector application sectors: Civil engineering, industrial maintenance and marine coatings
Historical benzyl alcohol status: Published selector literature identifies the grade as benzyl-alcohol-free
Solids content note: Older regional selector literature lists approximately 82-84% solids, while historical product nomenclature associates the suffix 90 with nominal solids classification; current public product data do not publish a present solids specification, so current TDS or COA should control any formal solids claim
Storage range: Approximately 2-40°C
Storage condition: Dry place, preferably sealed original container, protected from direct sunlight
Chemical inventories listed in current product information: IECSC, KECI, PICCS and TCSI
CAS Number: Commercial modified polyamidoamine-adduct solution; no single CAS number should be assigned to the complete trade grade without the current SDS
EC Number: Commercial mixture; no single EC number should be assigned to the complete trade grade without the current SDS
Molecular Formula: Not applicable to the complete commercial mixture
Molecular Weight: Variable / not applicable as one fixed value

Synonyms: ARADUR 460 J 90, Ethanol-Containing Polyamidoamine Adduct, Polyamidoamine Epoxy Hardener, Modified Polyamidoamine Curing Agent, Wet-Surface Epoxy Hardener, Underwater Epoxy Hardener, Concrete Adhesive Hardener, Marine Epoxy Hardener, High-Solids Coating Hardener, Heavy-Duty Anti-Corrosion Hardener, Wet-Concrete Epoxy Hardener, High-Humidity Epoxy Curing Agent, Benzyl-Alcohol-Free Polyamidoamine Hardener
ARADUR 460 J 90 should be treated as a proprietary commercial polyamidoamine-adduct solution rather than as one pure molecular substance. The active phase contains a distribution of amide- and amine-containing structures and the commercial grade also contains ethanol, so one fixed molecular formula, molecular weight or universal trade-product CAS number would not accurately represent the material as supplied. Current product-specific SDS and COA documentation should control formal composition, concentration and regulatory decisions.

WHAT IS ARADUR 460 J 90?

ARADUR 460 J 90 is a modified polyamidoamine adduct designed for epoxy systems that must maintain adhesion and cure under unusually wet or humid conditions.
The grade differs from ordinary polyamidoamine hardeners because it is specifically optimized for wet concrete, sand-blasted steel, high atmospheric humidity and even underwater coating applications when combined with suitable epoxy resins.
The commercial hardener is supplied in ethanol, which reduces handling viscosity and supports compatibility with high-solids and low-solvent resin systems.
A major advantage is its balance of workability and wet-surface performance. The hardener is viscous enough to provide body but still sufficiently fluid for practical mixing, pigment incorporation and mortar preparation.
ARADUR 460 J 90 can be combined with liquid epoxy resins such as ARALDITE GY 250, GY 764 and GY 783 for mortars, concrete adhesives and protective coatings.
The resulting systems can provide smooth, glossy, non-tacky cured films, very good wet adhesion and strong corrosion protection when the resin, ratio, substrate preparation and cure conditions are appropriate.

POLYAMIDOAMINE ADDUCT CHEMISTRY

Polyamidoamines contain both amide functionality and reactive amine groups. Their molecular architecture is commonly associated with strong adhesion, toughness, flexibility and good compatibility with mineral and metallic substrates.
An adducted polyamidoamine has undergone controlled reaction before final use. This increases molecular size and changes the balance of free amine functionality, compatibility and surface behavior.
Pre-adduction can improve cure performance under humid conditions and can reduce surface defects compared with an unmodified polyamidoamine.
ARADUR 460 J 90 retains enough reactive amine hydrogen to cure epoxy resins while benefiting from the interfacial properties of the larger polyamidoamine-adduct structure.
The chemistry is particularly effective where wetting and adhesion are difficult, including wet mineral surfaces and blasted steel.
Because the active curing-agent phase is polymeric and distributed rather than one discrete molecule, AHEW, amine value, gel time, viscosity and functional performance are more meaningful than a single structural formula.

HOW EPOXY CURING WORKS

Epoxy resins contain reactive oxirane rings. Primary and secondary amine hydrogens in ARADUR 460 J 90 attack these rings and open them, creating carbon-nitrogen bonds and hydroxyl groups.
Repeated reaction between multifunctional epoxy resin and multifunctional amine hardener creates a three-dimensional thermoset network.
The mixed system begins as a processable liquid, gradually increases in molecular weight and viscosity, reaches gelation and then continues curing in the solid state.
Ethanol does not become part of the principal epoxy network and must evaporate during coating or adhesive cure.
In thick mortars and adhesives, solvent escape can be slower than in thin films, so formulation and application thickness should be designed accordingly.
Final hardness, water resistance, corrosion resistance and chemical performance continue developing after the material first becomes non-tacky.

ETHANOL-CONTAINING FORM

ARADUR 460 J 90 is supplied as an ethanol-containing polyamidoamine adduct.
Ethanol acts primarily as a processing solvent that reduces the viscosity of the polymeric active hardener and improves practical mixing and application.
Compared with xylene-rich hardener solutions, ethanol provides a more polar solvent environment that can support compatibility with polar mineral surfaces and certain resin systems.
The ethanol content also contributes to the commercial product's approximately 35°C flash point.
Ventilation and ignition control are therefore important even though the cured epoxy itself is a solid thermoset.
Total coating VOC depends on the complete formulation, including resin-side solvents and any added thinner.

SOLIDS CONTENT

Published information about ARADUR 460 J 90 solids requires careful interpretation.
Older regional selector literature lists approximately 82-84% solids for the commercial grade.
Historical product nomenclature uses a terminal solids number in many solvent-containing hardener names, and the suffix 90 has been associated with nominal solids classification in that naming system.
Current public product information does not publish a present measured solids specification.
For this reason, a formal current solids claim should be taken from the current TDS, SDS or batch COA rather than inferred only from the grade name.
Where formulation calculations depend on exact non-volatile content, the current batch-specific value should control.

VISCOSITY

Current product information lists ARADUR 460 J 90 viscosity at approximately 2,500-5,500 mPa·s at 25°C.
Older selector literature showed a broader lower limit of approximately 1,800 mPa·s, which is useful historically but should not replace the current published range.
The viscosity is moderate for a polymeric hardener solution and allows practical pumping, mixing and incorporation into high-solids coatings or mortars.
Temperature affects viscosity strongly. Cold material becomes thicker, while warm material becomes more fluid.
Warm material can also cure faster after resin addition, so application procedures should control both viscosity and component temperature.
Unexpected viscosity change should be evaluated together with density, amine value and appearance.

AMINE VALUE

The published amine value of ARADUR 460 J 90 is approximately 240-270 mg KOH/g.
Amine value is a titration-based measurement of total basic nitrogen functionality expressed as equivalent potassium hydroxide.
It provides a useful quality-control fingerprint for the commercial hardener.
A significant reduction can indicate dilution, contamination or chemical change, while an abnormally high result can indicate the wrong material or analytical error.
Amine value is not equivalent to AHEW because basic nitrogen and reactive-hydrogen equivalents describe different aspects of the hardener.
Stoichiometric calculations should therefore use AHEW and resin-specific mix-ratio guidance.

ACTIVE HYDROGEN EQUIVALENT WEIGHT

Published selector literature gives ARADUR 460 J 90 an active-hydrogen equivalent weight of approximately 190 g/eq.
AHEW represents the mass of commercial hardener required to provide one equivalent of reactive amine hydrogen.
This value is consistent with the approximately 100:100 reference mix ratio used with ARALDITE GY 250.
A different epoxy resin can require a different hardener level because epoxy equivalent weight and formulation solids can differ.
AHEW should therefore be paired with the actual resin EEW when theoretical stoichiometry is calculated.
Where a validated product-specific ratio is available, that formulation should be used as the primary practical reference.

DENSITY

Current product information gives a density of approximately 0.98 g/cm³ at 20°C.
Density is useful for production calculations and conversion between mass and volume.
Weight-based metering remains preferable for stoichiometric accuracy because resin and hardener densities differ.
Volumetric metering equipment should be calibrated using actual density and processing temperature.
Density can also serve as a secondary quality-control check when evaluated together with viscosity and amine value.

FLASH POINT AND FLAMMABILITY

ARADUR 460 J 90 has a flash point of approximately 35°C by Pensky-Martens closed-cup testing.
The relatively low flash point reflects the ethanol-containing commercial form.
The product should therefore be handled as a flammable solvent-containing industrial chemical.
Ignition sources, sparks, smoking, hot surfaces and uncontrolled static discharge should be excluded from handling areas.
Ventilation is important because ethanol vapor can accumulate in enclosed spaces.
Fire response, storage segregation and electrical-equipment requirements should follow the current product-specific SDS and local regulations.

GEL TIME

Current product information gives a reference gel time of approximately 100 minutes at 23°C using a 250 g mass with ARALDITE GY 250.
Gel time provides a controlled comparison of curing-agent reactivity but should not be interpreted as a universal field pot life.
A coating or adhesive can lose ideal application properties before formal gelation.
Large mixed masses can react faster because epoxy-amine cure is exothermic and internal heat accelerates the reaction.
Thin films can behave differently because heat is dissipated more efficiently and solvent evaporation becomes important.
Practical working time should therefore be established using the final formulation, batch size and application temperature.

REFERENCE MIX RATIO

The optimum reference ratio for ARALDITE GY 250 and ARADUR 460 J 90 is approximately 100:100 parts by weight.
This 1:1 wet-weight ratio is specific to the commercial resin and hardener forms used in the reference system.
The ratio should not be transferred automatically to ARALDITE GY 764, ARALDITE GY 783 or another epoxy resin.
Different resin EEW values change theoretical reactive demand.
Additional components such as reactive diluents or mixed epoxy resins can also change the effective formulation ratio.
The complete system should be tested for gel time, adhesion, hardness, wet-surface performance and chemical resistance after any ratio change.

WET-CONDITION COMPATIBILITY

Extreme compatibility under wet conditions is one of the defining performance characteristics of ARADUR 460 J 90.
The hardener is intended for systems that must wet and bond to damp, wet or otherwise difficult-to-wet surfaces.
This is especially important in civil engineering and marine maintenance where ideal dry substrates are not always available.
Wet-condition compatibility should not be interpreted as permission to ignore contamination, weak laitance, salts or unstable surfaces.
The substrate must still be structurally sound and appropriately cleaned.
Performance should be validated under the actual moisture condition expected in service.

ADHESION TO WET CONCRETE

Very good adhesion to wet concrete is a major product advantage.
Concrete contains polar mineral surfaces and can hold significant moisture in pores, making many conventional coatings difficult to bond reliably.
The polyamidoamine-adduct structure provides strong interfacial interaction while the resin-hardener system develops a crosslinked epoxy network.
ARADUR 460 J 90 can therefore be used in concrete adhesives, bonding layers and repair mortars where moisture is difficult to eliminate completely.
Surface water, laitance, oil and weak concrete should still be removed where possible because they can create a mechanically weak interface.
Bond strength should be validated on concrete representative of the actual project condition.

ADHESION TO SAND-BLASTED STEEL

ARADUR 460 J 90 provides very good adhesion to sand-blasted steel in suitable epoxy systems.
Abrasive blasting removes rust and scale while creating surface profile for mechanical interlocking.
Strong amine-epoxy chemistry then develops a durable bond to the prepared metal surface.
Residual soluble salts, oil or blasting contamination can still reduce adhesion and corrosion resistance.
Steel preparation should therefore meet the coating specification before primer application.
Adhesion testing after cure and after water or salt exposure provides a more meaningful measure than dry-film appearance alone.

EXTREME HUMIDITY CURE

ARADUR 460 J 90 is specifically positioned for curing under very high atmospheric humidity.
Conventional amine-cured epoxies can suffer from surface tack, whitening, carbamate formation or poor intercoat adhesion when humidity is excessive.
The modified polyamidoamine-adduct chemistry improves compatibility and surface cure under these conditions.
High humidity tolerance is especially useful in marine, underground, coastal and civil-engineering work.
The coating system should still be evaluated for dew point and condensation because liquid water films can carry contaminants and interfere with mechanical bonding.
Humidity resistance belongs to the complete resin-hardener formulation rather than the hardener alone.

UNDERWATER COATING CAPABILITY

Underwater coating is one of the most distinctive application areas for ARADUR 460 J 90.
A successful underwater epoxy system must displace or tolerate water at the interface, wet the substrate and continue curing despite constant contact with liquid water.
ARADUR 460 J 90 provides the wet-condition compatibility needed for such formulations when combined with suitable liquid epoxy resin and fillers.
The application method, substrate profile, water temperature, current or movement and contamination level all affect performance.
Underwater suitability should therefore be demonstrated with the final system under realistic application conditions.
The hardener itself should not be interpreted as making every generic epoxy resin automatically suitable for underwater use.

SMOOTH SURFACE DEVELOPMENT

Enhanced surface smoothness is a current product feature.
Good compatibility between resin and hardener helps the wet film level before gelation.
Smoothness can improve appearance and can also reduce local thin spots or roughness that might weaken barrier protection.
Pigment loading, solvent balance, application method and substrate profile influence the final surface.
A smooth film should still be checked for adequate thickness and absence of pinholes.
High smoothness is particularly useful in marine finishes and high-solids protective coatings.

HIGH GLOSS

High gloss is another current product feature.
Gloss depends on surface smoothness, compatibility, cure uniformity and pigment dispersion.
ARADUR 460 J 90 can produce smooth glossy non-tacky films with suitable epoxy resins.
Late-pot-life application, excessive moisture, incompatible additives or poor leveling can reduce gloss.
Exterior gloss retention also depends on epoxy UV stability and topcoat design.
High initial gloss should therefore be distinguished from long-term weathering resistance.

NON-TACKY CURE

Properly formulated ARADUR 460 J 90 systems can form non-tacky cured films even under demanding wet or humid conditions.
A non-tacky surface reduces dirt pickup and improves handling and recoating.
The property is particularly valuable in marine and civil-engineering maintenance where surfaces may remain exposed to humid air during cure.
Tack-free appearance does not mean that the epoxy network has reached full chemical conversion.
Chemical exposure and heavy mechanical loading should begin only after the specified cure period.
The complete formulation should be tested under the intended temperature and humidity.

CORROSION RESISTANCE

A high degree of anti-corrosion protection is a key performance attribute of ARADUR 460 J 90 systems.
The cured epoxy binder forms a barrier that slows transport of water, oxygen and ions toward the metal substrate.
Very good adhesion to sand-blasted steel helps limit underfilm corrosion propagation.
Anti-corrosive pigments and lamellar fillers can supplement the binder's barrier performance.
Film thickness, surface preparation and absence of pinholes remain critical.
Finished primer or coating systems should be validated through salt-spray, cyclic-corrosion or immersion testing appropriate to the target service.

APPLICATIONS

High-solids coatings
High-solids coatings are a primary application. ARADUR 460 J 90 allows strong protective performance while limiting the amount of additional solvent needed in the full coating.

Heavy-duty anti-corrosion coatings
The grade is especially relevant to protective coatings for steel exposed to water, salts and industrial environments. Strong adhesion and wet-condition cure are major advantages.

Marine finishes
Marine finishes are a primary current end use. ARADUR 460 J 90 can be used in suitably formulated marine epoxy systems where humidity, wet substrates and corrosion are major concerns.

Marine primers
Prepared ship steel and marine structures can use compatible ARADUR 460 J 90 primer systems where strong adhesion and moisture tolerance are required.

Underwater coatings
The grade is specifically suitable for underwater coating systems when paired with compatible epoxy resin and an application method designed for submerged use.

Splash-zone coatings
Areas exposed to repeated wetting and drying can benefit from strong wet adhesion and corrosion resistance.

Shipbuilding coatings
Steel fabrication and shipyard maintenance can use ARADUR 460 J 90 where atmospheric humidity is high and rapid movement to fully dry conditions is impractical.

Marine maintenance coatings
Repair of vessels, docks and marine equipment can use the grade where wet or damp surfaces are expected.

Coastal infrastructure coatings
Steel and concrete near marine environments can use compatible protective systems after salt contamination and surface condition are evaluated.

Port and harbor structures
Piles, supports and other structures in wet marine environments can use suitably qualified ARADUR 460 J 90 epoxy systems.

Epoxy mortars
Mortars are a primary application. The hardener can be combined with liquid epoxy resin and graded mineral aggregate for repair, bedding or surfacing.

Concrete repair mortars
Wet or damp concrete repairs can benefit from the grade's strong adhesion and moisture compatibility.

Rapid patching mortars
Small repairs can use ARADUR 460 J 90 where workability, wet adhesion and cured strength are balanced.

Marine repair mortars
Mineral-filled epoxy repair materials can be formulated for marine concrete or steel interfaces where wet conditions are unavoidable.

Concrete adhesives
Concrete adhesives are a primary end use. ARADUR 460 J 90 can bond concrete surfaces under humid or damp conditions.

Old-to-fresh concrete bonding
The grade is specifically positioned as an adhesive agent between old and fresh concrete.

Concrete-to-concrete bonding
Prepared mineral surfaces can be bonded using compatible epoxy adhesive formulations based on ARADUR 460 J 90.

Concrete-to-steel bonding
Steel plates, brackets or reinforcement can be bonded to concrete when both surfaces are properly prepared.

Wet-concrete adhesives
The grade is especially suitable where the concrete cannot be dried completely before bonding.

Construction adhesives
Building and civil-engineering adhesive systems can use ARADUR 460 J 90 where wet-surface adhesion and chemical durability are required.

Structural repair adhesives
Structural repair systems can use the hardener where bond strength and environmental resistance have been validated.

Bridge repair systems
Concrete and steel bridge components can use wet-tolerant epoxy bonding or repair formulations where application conditions are controlled.

Tunnel repair systems
High humidity and damp mineral surfaces make the grade relevant to selected tunnel maintenance and repair applications.

Basement and underground coatings
Damp mineral surfaces and high humidity can make ARADUR 460 J 90 useful in protective underground epoxy systems.

Foundation repair adhesives
Concrete bonding applications can use wet-tolerant epoxy where moisture cannot be eliminated fully.

Steel primers
Sand-blasted steel can be protected with high-solids epoxy primers based on ARADUR 460 J 90.

Structural-steel coatings
Industrial and marine structural steel can use compatible protective primer and intermediate systems.

Direct-to-metal coatings
DTM systems can be developed where adhesion and barrier performance are combined in one coating layer.

Tank coatings
Tank exteriors and selected internal service can use compatible ARADUR 460 J 90 epoxy systems after service-specific resistance testing.

Pipe coatings
Prepared pipes can use the grade for atmospheric, marine and selected industrial exposure.

Machinery coatings
Industrial machinery can use high-solids epoxy systems where adhesion, gloss and corrosion resistance are important.

Equipment coatings
Pumps, frames and process equipment can use the hardener in durable protective systems.

Industrial maintenance coatings
Industrial maintenance is an established application area, especially where humidity and surface moisture complicate ordinary epoxy cure.

Civil-engineering coatings
Civil engineering is an established application sector. Concrete protection, repair and bonding are particularly relevant.

Concrete protective coatings
Wet or damp concrete can be protected using compatible coatings where the system has been validated for the actual moisture condition.

Concrete floor repair
Epoxy mortars and bonding layers can use ARADUR 460 J 90 for repairs where the slab contains residual moisture.

Floor primers
Wet-tolerant primer layers can be developed for concrete where complete drying is impractical, subject to vapor-pressure evaluation.

Industrial floors
Heavy-duty floors can use compatible ARADUR 460 J 90 binder systems where moisture, chemical exposure and mechanical loading are addressed.

High-humidity floor repairs
Small repair areas in humid facilities can use wet-tolerant epoxy mortars or adhesives.

Adhesion-promoting primers
Strong wet adhesion can be used to create a bonding layer between difficult substrates and later coating layers.

Barrier coatings
Dense epoxy films can slow moisture and ion movement through the coating.

Zinc-phosphate primers
Compatible inhibitive pigments can supplement the binder's anti-corrosion performance.

Lamellar-pigment primers
Mica and micaceous iron oxide can increase the diffusion path through high-build protective coatings.

High-gloss protective coatings
The grade can support smooth glossy cured films where appearance and protection are both important.

Low-solvent coatings
The ethanol-containing commercial form can be used in low-solvent high-solids coating systems when total VOC and flash point are managed.

Maintenance mastics
Filled high-build mastics can use ARADUR 460 J 90 where wet adhesion and sag resistance are required.

Wet-surface primers
The grade is specifically relevant to damp, wet and difficult-to-wet substrates when the full coating system is formulated for that condition.

Underwater repair coatings
Localized submerged repair can use qualified ARADUR 460 J 90 epoxy systems where substrate cleaning and application method are appropriate.

Water-retaining infrastructure repairs
Concrete structures exposed to persistent moisture can use wet-tolerant epoxy bonding or repair systems after suitability testing.

Marine concrete repairs
Piers, quay walls and other concrete exposed to water can use compatible adhesive or mortar technology based on ARADUR 460 J 90.

Chemical-resistant maintenance coatings
Properly cured epoxy networks can provide resistance to many industrial chemicals depending on the resin and exposure.

General wet-condition epoxy systems
Other applications are possible where resin compatibility, substrate preparation, wetting, solvent release and cure under moisture have been validated.

ARALDITE GY 250 REFERENCE SYSTEM

ARALDITE GY 250 is the principal current reference resin for ARADUR 460 J 90.
The optimum mix ratio is approximately 100 parts ARALDITE GY 250 to 100 parts ARADUR 460 J 90 by weight.
The reference gel time is approximately 100 minutes at 23°C using a 250 g mass.
The 1:1 wet-weight ratio is a convenient practical reference but is not universal across other epoxy resins.
The system is relevant to high-solids coatings, mortars, concrete adhesives and wet-condition applications.
Performance should be evaluated for wet adhesion, non-tacky cure, corrosion resistance and mechanical properties under the intended service conditions.

ARALDITE GY 764 COMPATIBILITY

ARALDITE GY 764 is listed as a compatible liquid epoxy-resin example for ARADUR 460 J 90.
A liquid resin can provide good wetting and practical mixing in mortars or adhesive systems.
The correct hardener ratio should be calculated from the actual resin EEW and confirmed through current formulation data.
The GY 250 100:100 ratio should not be copied automatically to GY 764.
Wet-surface adhesion and cure under high humidity should be validated on the final formulation.

ARALDITE GY 783 COMPATIBILITY

ARALDITE GY 783 is another liquid epoxy-resin example specifically associated with ARADUR 460 J 90 application guidance.
Its lower-viscosity liquid-resin character can be useful in mortars, adhesives and high-solids coatings.
Hardener demand depends on the actual epoxy equivalent weight and resin composition.
The final formulation should be tested for pot life, film appearance, wet adhesion, chemical resistance and mechanical strength.
High humidity or underwater use should always be validated using the exact resin-hardener system rather than inferred from hardener data alone.

LIQUID EPOXY RESIN COMPATIBILITY

ARADUR 460 J 90 is primarily positioned with compatible liquid epoxy resins.
Liquid resin supports wetting of concrete pores, blasted steel profile and mineral aggregate.
The hardener's ethanol-containing polyamidoamine-adduct structure can blend effectively with suitable liquid resins while maintaining workable viscosity.
Resin functionality and EEW determine the required hardener quantity.
Reactive diluents can change both viscosity and stoichiometry and should be included in the calculation.
Compatibility should be checked visually and through cured-film performance.

BENZYL-ALCOHOL-FREE CHARACTER

Published selector literature identifies ARADUR 460 J 90 as benzyl-alcohol-free.
Benzyl alcohol is commonly used in some amine curing agents as a viscosity reducer or cure modifier.
ARADUR 460 J 90 instead uses ethanol as its principal identified solvent carrier.
The absence of benzyl alcohol can be useful where migration, water sensitivity or formulation restrictions make that component undesirable.
The complete coating should still be reviewed because benzyl alcohol or other volatile substances can enter through resin-side or additive components.
Formal restricted-substance claims should be based on current product-specific documentation.

HIGH-SOLIDS COATING DESIGN

ARADUR 460 J 90 is specifically positioned for high-solids coatings.
High-solids technology reduces the quantity of volatile material required to apply a given dry-film thickness.
The hardener itself contains ethanol, so the complete formulation is not automatically solvent-free or zero-VOC.
High solids can increase viscosity and film-build capability, so rheology and application equipment must be matched carefully.
Thick wet films also retain solvent longer, which can affect early hardness and surface appearance.
The formulation should therefore balance solids, viscosity, solvent release and cure speed.

ETHANOL EVAPORATION

Ethanol must leave the coating or adhesive during cure because it does not form part of the principal epoxy network.
Thin coatings allow relatively efficient evaporation because surface area is large.
Thick mortars, deep joints or enclosed bond lines can trap solvent more easily.
Retained ethanol can delay hardness, reduce early chemical resistance or contribute to voiding if heated too rapidly.
Ventilation and film thickness should therefore be controlled.
Underwater formulations require special design because solvent behavior differs radically from atmospheric coating cure.

UNDERWATER FORMULATION CONSIDERATIONS

Underwater use requires more than simply selecting a water-tolerant hardener.
The resin-hardener system must wet the substrate while submerged and resist being displaced by water before gelation.
Fillers or thixotropes can increase cohesion and prevent washout.
Application pressure or hand placement may be needed to force the material into intimate contact with the substrate.
Water temperature influences viscosity and cure speed.
Surface contamination such as algae, slime, salts or weak corrosion products should be removed before application whenever practical.

CONCRETE BONDING

ARADUR 460 J 90 is specifically suitable as an adhesive agent between old and fresh concrete.
The old concrete surface should be mechanically sound and free from weak laitance, dust, oil and incompatible coatings.
A roughened profile increases effective contact area and mechanical key.
The epoxy bonding layer should be applied uniformly so fresh concrete contacts the adhesive before the permitted bonding interval closes.
Residual moisture can be tolerated better than with many conventional systems, but standing contamination should still be removed.
Bond performance should be qualified through pull-off, slant-shear or other relevant testing.

MORTAR FORMULATION

Epoxy mortars combine resin, hardener and mineral aggregate.
ARADUR 460 J 90 provides wet-surface adhesion and workable viscosity for this application.
Silica sand, quartz and selected mineral fillers can be used to increase compressive strength and reduce polymer demand.
A broad aggregate particle-size distribution can improve packing efficiency.
Dry aggregate is generally preferred, although the hardener is designed to tolerate moist service conditions.
The resin-to-aggregate ratio should provide enough binder for full wetting without creating excessive cost, shrinkage or exotherm.

RHEOLOGY CONTROL

Protective coatings and mortars require rheology appropriate to application geometry.
Vertical underwater coatings need enough low-shear structure to resist sag or washout.
High-solids spray coatings require shear thinning so material can pass through application equipment.
Fumed silica, mineral fillers, organoclays or polymeric thixotropes can be evaluated where compatible with the epoxy-solvent system.
Excessive thixotropy can reduce leveling and gloss.
Rheology should therefore be optimized together with wetting, film build and application method.

PIGMENTS AND FILLERS

Pigments and fillers can be incorporated into ARADUR 460 J 90 coating systems when chemically compatible.
Titanium dioxide, iron oxides, zinc phosphate, barytes, talc, silica, mica and micaceous iron oxide are examples of classes that may be evaluated.
Pigment surfaces can adsorb amine, alter cure or change viscosity.
Dense pigments can settle rapidly unless the formulation has sufficient low-shear structure.
Soluble salts in mineral fillers should be minimized for anti-corrosion applications.
The fully formulated coating should be checked for pot life, gloss, adhesion and corrosion performance.

ANTI-CORROSIVE PIGMENTS

Anti-corrosive pigments can supplement the strong barrier performance of the cured binder.
Zinc phosphate and related inhibitive pigments can reduce corrosion at coating defects.
Lamellar materials can increase diffusion path length through the film.
Pigment volume should be balanced so the binder remains continuous.
Very high pigment loading can create porosity even when individual pigments are beneficial.
Salt-spray or cyclic-corrosion testing should be performed on the final coating system.

SURFACE PREPARATION

Wet-tolerant chemistry does not eliminate the need for surface preparation.
Concrete should be sound and free from loose material, weak laitance, grease and incompatible coatings.
Steel should be free from oil, salts, loose rust and mill scale and should have the required abrasive-blast profile for severe service.
Underwater surfaces may need mechanical cleaning immediately before application because biological contamination can reform quickly.
A damp but clean substrate is different from a contaminated wet substrate.
Adhesion depends on direct contact with a mechanically stable surface.

CONCRETE MOISTURE

ARADUR 460 J 90 is specifically suited to wet concrete, but moisture condition still affects the complete system.
Hydrostatic pressure or active water flow can create forces far greater than simple surface dampness.
Moisture vapor can also move through concrete after the epoxy has cured.
Dense coatings can blister if vapor pressure exceeds adhesion strength.
The project should therefore distinguish between damp surface, saturated concrete, active leakage and hydrostatic exposure.
Each condition may require different preparation or system design.

HIGH-HUMIDITY APPLICATION

High atmospheric humidity is a principal target condition for ARADUR 460 J 90.
The modified polyamidoamine-adduct structure helps maintain surface cure and adhesion under humid air.
High humidity can still slow ethanol evaporation and can affect the resin side of the formulation.
Air movement and substrate temperature should therefore be controlled where possible.
A substrate below the dew point can collect liquid condensation even when the air itself is acceptable.
Dew-point control remains important for steel-coating quality.

LOW-TEMPERATURE APPLICATION

Low temperature increases viscosity and slows epoxy-amine reaction.
ARADUR 460 J 90 is not defined solely as a low-temperature hardener, so minimum cure temperature should be validated for the final formulation.
Cold steel or concrete can also retain moisture and slow solvent evaporation.
If heat is used to accelerate cure, the increase should be controlled so ethanol is not trapped beneath a rapidly hardening surface.
Component and substrate temperatures should be recorded during qualification testing.
Large mortars may self-heat and behave differently from thin coatings.

POT LIFE

The approximately 100-minute reference gel time provides a useful measure of moderate reactivity.
Practical pot life depends on resin, temperature, mixed mass and additives.
Pigments, fillers or catalytic contaminants can change the working window.
Large batches can self-heat and shorten pot life substantially.
Underwater or mortar application may require enough open time for placement and consolidation, so batch size should match the application rate.
Material beyond the validated working period should not be restored with solvent or fresh hardener.

EXOTHERM CONTROL

Epoxy-amine cure releases heat.
Large mixed masses retain heat and can accelerate their own reaction.
Mineral aggregate in epoxy mortars reduces the fraction of reactive binder and can moderate temperature rise.
Unfilled adhesive or coating batches can become hotter than expected if mixed in large volumes.
Smaller batch size and controlled component temperature reduce exotherm risk.
Mixed material should not be left reacting unattended in closed containers.

ADHESION

Excellent adhesion is a core product feature.
ARADUR 460 J 90 is notable for very good adhesion to wet concrete and sand-blasted steel.
The polyamidoamine structure provides strong polar interaction with mineral and metallic surfaces while the epoxy network builds cohesive strength.
Surface contamination can still overwhelm good chemistry.
Adhesion should be measured after full cure and, for demanding service, after water or chemical exposure.
Failure mode should be examined because cohesive failure in weak concrete differs from adhesive failure at the interface.

CHEMICAL RESISTANCE

Chemical resistance depends on the complete resin-hardener system rather than the hardener alone.
A well-cured epoxy network can resist many oils, salts, cleaners and industrial chemicals.
Continuous immersion is more demanding than intermittent splash.
Underwater coating service also exposes the film continuously to water and dissolved ions.
Resistance should therefore be validated under the actual fluid, temperature and exposure duration.
Full cure should be reached before severe chemical exposure begins whenever practical.

WATER RESISTANCE

ARADUR 460 J 90 is specifically designed for wet-condition compatibility, but final water resistance still develops through cure.
Early immersion of a non-qualified formulation can produce softening or leaching of residual low-molecular-weight components.
Underwater formulations are designed around this challenge and should be tested specifically for submerged cure.
Atmospheric coatings should normally be allowed to cure sufficiently before immersion unless the system is qualified otherwise.
Water resistance should be assessed together with adhesion, blistering and mechanical integrity.
Resin selection has a major influence on final performance.

RECOATABILITY

Protective coating systems often require several layers.
A following coat applied within the chemical recoat window can bond strongly to the underlying epoxy layer.
If the first coat becomes fully cured, mechanical abrasion or cleaning may be required.
Wet-condition cure can sometimes produce surface contamination from the environment, so inspection is important before recoating.
Salt, slime, dirt or amine-derived surface deposits should be removed.
The recoat schedule should be validated at the actual temperature and humidity.

AMINE BLUSH

Amine blush can form when reactive amines interact with moisture and carbon dioxide.
ARADUR 460 J 90 is designed for demanding humidity and wet conditions, but the complete coating should still be evaluated for surface deposits.
Blush can interfere with gloss and intercoat adhesion.
Any visible greasy, waxy or cloudy deposit should be removed before subsequent coating.
Underwater or constantly wet applications have different surface chemistry from atmospheric cure and require system-specific evaluation.
Good compatibility does not make all surface-preparation rules unnecessary.

WEATHERING

Epoxy coatings provide strong adhesion and barrier performance but conventional epoxy resin can chalk or lose gloss under prolonged ultraviolet exposure.
ARADUR 460 J 90 supports high initial gloss and smooth surface development, but long-term exterior appearance depends on the full coating stack.
For demanding color and gloss retention, an epoxy primer or intermediate layer is commonly protected with a UV-resistant topcoat.
Marine finishes may be used in locations with significant sunlight, so weathering strategy should be considered.
The hardener's wet-condition advantages do not replace dedicated exterior weathering technology.

QUALITY CONTROL

Important quality-control parameters include appearance, color, viscosity, amine value, density, gel behavior and, where specified, solids content.
Current viscosity should be approximately 2,500-5,500 mPa·s at 25°C and amine value approximately 240-270 mg KOH/g.
Density is approximately 0.98 g/cm³ at 20°C and reference gel time approximately 100 minutes with ARALDITE GY 250 under the stated test.
Color can vary from yellowish to brownish and can occasionally appear greenish without necessarily indicating performance loss.
Exact solids should be confirmed from current product-specific documentation because older published values and historical nomenclature are not fully aligned.
A functional resin cure test can provide additional confirmation of application consistency.

WHY AHEW MATTERS

The approximately 190 g/eq AHEW connects hardener mass directly to reactive amine hydrogen.
Using the AHEW of another polyamidoamine grade can create a significant stoichiometric error.
AHEW should be paired with the resin EEW when theoretical formulation is calculated.
The 100:100 ARALDITE GY 250 reference ratio provides a practical validated starting point for that resin.
Other resin grades require their own calculation and performance confirmation.

WHY GEL TIME MATTERS

Gel time provides a standardized measure of cure reactivity.
The approximately 100-minute reference value indicates a useful balance between working time and ambient cure.
Practical pot life may be shorter because leveling, mortar placement or wetting can deteriorate before formal gelation.
Temperature and mixed mass can change cure speed substantially.
The final application procedure should therefore define usable working time separately from laboratory gel time.

WHY FLASH POINT MATTERS

The approximately 35°C flash point is an important handling parameter because ARADUR 460 J 90 contains ethanol.
The product requires flammable-liquid precautions during storage, transfer and application.
Warm environments can increase ethanol vapor concentration.
Ignition control and ventilation should therefore be integrated into the coating process.
The flash point of the hardener does not determine the flash point of the entire mixed coating, which depends on all formulation components.

TDS, SDS AND COA

The current Technical Data Sheet or official product information should be used for present physical properties, mix ratios, application guidance and storage conditions.
The Safety Data Sheet governs formal composition disclosure, flammability, hazard classification, first aid, transport and disposal.
The Certificate of Analysis provides batch-specific controlled values where supplied.
Historical selector literature is useful for AHEW, older viscosity ranges, application sectors, benzyl-alcohol-free status and earlier solids information.
Where historical and current values differ, current product-specific documentation should take precedence.
Exact solids content should especially be confirmed from current documentation rather than inferred solely from the product suffix.

SAFETY AND HANDLING

ARADUR 460 J 90 is a reactive amine-containing hardener supplied in ethanol and should be handled according to the current SDS.
Chemical-resistant gloves, suitable eye protection and protective clothing should be used.
Good ventilation is important because ethanol vapor can accumulate and because spray application can create aerosol.
Ignition sources must be controlled because the product flash point is approximately 35°C.
The complete epoxy formulation can contain other hazardous ingredients, so workplace controls should reflect the full system rather than the hardener alone.
Industrial hygiene procedures should cover storage, mixing, transfer, application and cleanup.

SKIN CONTACT

Direct skin contact should be avoided because reactive amines can irritate skin and may contribute to sensitization.
Ethanol can also increase skin dryness and can facilitate spreading of uncured hardener.
Contaminated skin should be washed promptly according to current SDS guidance.
Solvents should not be used for skin cleaning.
Contaminated clothing should be removed and cleaned or disposed of appropriately.

EYE CONTACT

Eye protection is essential during pumping, mixing, mortar preparation and application.
If product enters the eyes, immediate prolonged rinsing with clean water should begin.
Medical attention should be obtained according to current SDS guidance.
Emergency eyewash equipment should be available in routine handling areas.
Contact lenses should not delay flushing.

INHALATION

Ethanol vapor and coating aerosol create inhalation exposure potential.
Ventilation should control airborne concentration, especially in enclosed marine or civil-engineering spaces.
Spray application can require additional respiratory protection.
Respiratory equipment should be selected through workplace risk assessment and current SDS guidance.
Confined-space application requires dedicated atmospheric monitoring and ventilation.

INGESTION

ARADUR 460 J 90 is an industrial chemical and must not be ingested.
Food and beverages should be excluded from formulation and application areas.
After accidental ingestion, current SDS instructions and professional medical guidance should be followed.
Because the product contains ethanol and reactive amine components, generic first-aid assumptions should not replace product-specific guidance.

SPILL MANAGEMENT

A spill can spread because the material is a liquid solvent-containing hardener.
Ignition sources should be removed where safe and the area should be ventilated.
Personnel should use suitable PPE.
Compatible absorbent can be used for small spills, while larger releases may require pumping and specialized response.
Discharge to drains, soil or surface water should be prevented.
Recovered material and contaminated absorbent should be managed according to applicable waste rules.

FIRE RESPONSE

The approximately 35°C flash point means strict fire precautions are required.
Ethanol vapor can form flammable mixtures with air.
Combustion and thermal decomposition of the organic amine fraction can generate hazardous fumes.
Firefighters may require self-contained breathing apparatus and chemical-resistant protective equipment.
Extinguishing media and emergency procedures should follow the current SDS and facility fire plan.
Containers exposed to heat should be managed carefully because internal pressure can rise.

STORAGE

ARADUR 460 J 90 should be stored in a dry place, preferably in the sealed original container, at approximately 2-40°C.
Direct sunlight should be avoided.
Containers should remain tightly closed to reduce ethanol loss and contamination.
Storage areas should be suitable for flammable liquids and should control ignition sources.
The hardener can vary from yellowish to brownish and may occasionally show a greenish appearance without necessarily losing technical performance.
The expiry date on the original container and current product documentation should govern shelf-life decisions.

REGULATORY CONSIDERATIONS

ARADUR 460 J 90 is a proprietary commercial polyamidoamine-adduct solution containing ethanol.
Current product information lists IECSC, KECI, PICCS and TCSI inventory status.
Historical selector literature identifies the grade as benzyl-alcohol-free and places it in civil-engineering, industrial-maintenance and marine-coating applications.
These regulatory or composition-related statements are time-sensitive and should be confirmed from current product-specific documentation when used formally.
Generic suitability for marine coatings or concrete adhesives does not establish approval for food contact, potable water, medical devices or other specialized regulated uses.
Compliance must be assessed for the complete formulation and intended market.

ENVIRONMENTAL CONSIDERATIONS

The ethanol-containing form contributes volatile organic emissions during coating or adhesive cure.
Uncured amine-containing material should not be released directly to soil, drains or surface water.
Underwater application should be formulated to minimize uncured material loss into the surrounding water.
Cleaning solvent, contaminated absorbent and leftover mixed coating should be managed under applicable waste rules.
Fully cured epoxy has different mobility and reactivity from uncured components, but disposal requirements remain jurisdiction-specific.
VOC reduction can be pursued through high-solids formulation while preserving the wet-condition performance of the system.

COMMON FORMULATION PROBLEMS

Poor adhesion to wet concrete
Weak laitance, oil, surface contamination or active water flow can prevent bonding even with a wet-tolerant hardener. Mechanically prepare the concrete and distinguish simple dampness from hydrostatic leakage.

Poor adhesion to steel
Residual salts, rust, oil or insufficient blast profile can weaken adhesion. Improve steel preparation before changing the hardener.

Underwater washout
A formulation that is too fluid can be displaced by water before gelation. Increase cohesive rheology and validate the application method.

Short pot life
Warm components, large batch size or reactive pigments can accelerate cure. Reduce batch size and standardize material temperature.

Slow cure
Low temperature, incorrect ratio or retained solvent can delay cure. Verify stoichiometry, temperature and film thickness.

Soft film
Residual ethanol, off-ratio cure or insufficient cure time can leave the film soft. Improve solvent release and confirm mix ratio.

Persistent tack
Incorrect resin compatibility, excess humidity effects or insufficient cure can leave the surface tacky. Confirm the complete system rather than adding
extra hardener blindly.

Poor gloss
Late application, poor leveling, trapped solvent or incompatible additives can reduce gloss. Apply within the validated pot life and optimize solvent release.

Pinholes
Entrained air, substrate outgassing or rapid solvent escape can create pinholes. Improve mixing, deaeration and application thickness.

Solvent popping
Rapid surface cure can trap ethanol beneath the film. Reduce wet-film thickness or modify drying conditions.

Sagging
Excessive solvent or insufficient rheology can cause vertical sag. Increase compatible low-shear structure and control wet-film build.

Mortar too dry
Excess aggregate or insufficient binder can prevent complete wetting. Adjust aggregate grading and binder level.

Mortar too fluid
Too much binder or insufficient fine filler can reduce trowelability. Rebalance filler distribution and rheology.

Poor anti-corrosion performance
Low dry-film thickness, pinholes, weak steel preparation or poor pigment design can reduce protection. Evaluate the complete primer system.

Amine blush
Moisture and carbon dioxide can create surface deposits. Clean the surface before recoating if blush appears.

Intercoat adhesion failure
Overcure, contamination or surface deposits can interfere with the next coat. Follow the validated recoat window and prepare fully cured surfaces.

Unexpected color variation
Yellowish, brownish or occasional greenish appearance can occur without necessarily affecting performance. Confirm viscosity, amine value and cure response
before rejecting material solely on color.

Unexpected low viscosity
Solvent contamination or elevated temperature can lower viscosity. Check temperature, density and amine value.

Unexpected high viscosity
Cold temperature, ethanol loss or aging can increase viscosity. Condition the material and compare with current specification.

Inconsistent underwater cure
Water temperature, current, substrate contamination or resin choice can change cure. Qualify the exact formulation under realistic submerged conditions.

FREQUENTLY ASKED QUESTIONS

What is ARADUR 460 J 90?
ARADUR 460 J 90 is a modified ethanol-containing polyamidoamine-adduct epoxy curing agent.

What is the viscosity?
Current product information gives approximately 2,500-5,500 mPa·s at 25°C.

What is the amine value?
Approximately 240-270 mg KOH/g.

What is the active hydrogen equivalent weight?
Published selector literature gives approximately 190 g/eq.

What is the density?
Approximately 0.98 g/cm³ at 20°C.

What is the flash point?
Approximately 35°C by Pensky-Martens closed-cup testing.

What is the reference gel time?
Approximately 100 minutes at 23°C using a 250 g mass with ARALDITE GY 250.

What is the reference mix ratio with ARALDITE GY 250?
Approximately 100 parts resin to 100 parts ARADUR 460 J 90 by weight.

What are the main applications?
High-solids coatings, epoxy mortars, concrete adhesives, marine finishes, extreme-humidity systems and underwater coatings.

Can ARADUR 460 J 90 be used underwater?
Yes. It is specifically positioned for underwater coating systems when combined with a suitable epoxy resin and properly formulated for submerged application.

Can ARADUR 460 J 90 bond to wet concrete?
Yes. Very good adhesion to wet concrete is one of the key documented performance characteristics.

Can ARADUR 460 J 90 be used on steel?
Yes. It provides very good adhesion to properly sand-blasted steel in suitable epoxy systems.

Does ARADUR 460 J 90 provide corrosion resistance?
Yes. High anti-corrosion protection is a key documented property of suitable cured systems.

Does ARADUR 460 J 90 produce high-gloss films?
Yes. Smooth, glossy, non-tacky cured films are among its documented performance characteristics.

Is ARADUR 460 J 90 suitable for high humidity?
Yes. It is specifically designed for satisfactory curing under very high atmospheric humidity.

Which epoxy resins are specifically associated with ARADUR 460 J 90?
Liquid epoxy-resin examples include ARALDITE GY 250, ARALDITE GY 764 and ARALDITE GY 783.

Is the 100:100 mix ratio universal?
No. The 100:100 ratio is specific to the ARALDITE GY 250 reference system.

Is ARADUR 460 J 90 benzyl-alcohol-free?
Published selector literature identifies the grade as benzyl-alcohol-free.

What solvent does ARADUR 460 J 90 contain?
The commercial hardener is supplied in ethanol.

What is the solids content?
Older regional selector literature lists approximately 82-84% solids, while historical nomenclature associates the suffix 90 with nominal solids classification. Because current public product information does not publish a present solids value, the current TDS or COA should control any formal solids specification.

Is ARADUR 460 J 90 flammable?
Yes. Its ethanol-containing form has a flash point around 35°C, so flammable-liquid precautions are required.

Can ARADUR 460 J 90 be used between old and fresh concrete?
Yes. It is specifically positioned as an adhesive agent between old and fresh concrete.

Can ARADUR 460 J 90 be used for epoxy mortar?
Yes. Epoxy mortars are a primary documented application.

Can ARADUR 460 J 90 be used for marine coatings?
Yes. Marine finishes and marine protective systems are important application areas.

Does ARADUR 460 J 90 have one CAS number?
No. The complete commercial grade is a formulated polyamidoamine-adduct solution and should not be assigned one CAS number without confirmation from the current SDS.

How should ARADUR 460 J 90 be stored?
Store dry in the sealed original container at approximately 2-40°C, protect from direct sunlight and follow flammable-liquid storage requirements.

Can the hardener appear greenish?
Yes. An occasional greenish appearance can occur without necessarily affecting technical performance.

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

Compatible liquid epoxy-resin examples include ARALDITE GY 250, GY 764 and GY 783, but each resin requires its own validated formulation ratio.
Extreme wet-condition compatibility is the defining performance advantage. Properly formulated systems can provide very good adhesion to wet concrete and sand-blasted steel.
ARADUR 460 J 90 is specifically suitable for underwater coatings and for wet, damp and difficult-to-wet substrates when the complete formulation and application method are designed for those conditions.

Current product features include corrosion resistance, enhanced surface smoothness, excellent adhesion and high gloss.
Properly formulated systems can produce smooth, glossy and non-tacky cured films with a high degree of anti-corrosion protection.
Concrete adhesive use is especially important, including bonding between old and fresh concrete.
The ethanol-containing commercial form supports manageable viscosity and high-solids formulation but creates a relatively low flash point, so ventilation and ignition control are required.

Older regional selector literature lists approximately 82-84% solids, while historical nomenclature associates the suffix 90 with nominal solids classification. Current batch-specific TDS or COA data should therefore control any formal solids statement.
Published selector literature identifies ARADUR 460 J 90 as benzyl-alcohol-free.
Wet-tolerant chemistry does not eliminate the need for proper substrate preparation. Concrete should be mechanically sound and steel should be clean, salt-free and appropriately blasted.
Underwater use requires system-level qualification for water temperature, substrate contamination, application method, washout resistance and cure.
High-solids coating design must balance viscosity, ethanol evaporation, film thickness and cure speed.

Quality control should focus on viscosity, amine value, density, color, functional gel response and current batch solids where specified.
ARADUR 460 J 90 is a proprietary commercial mixture and should not be assigned an invented single molecular formula, molecular weight, CAS number or EC number.
Storage should be dry in the sealed original container at approximately 2-40°C and away from direct sunlight.
For ARADUR 460 J 90 technical specifications, application guidance, TDS, SDS, COA and formulation information, contact Ataman Chemicals with the intended epoxy resin, substrate condition, humidity level, underwater or atmospheric application method and required protective performance.

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