ARADUR 75-1

ARADUR 75-1 is a medium-viscosity formulated polyether-urethane polyamine epoxy curing agent developed for viscoelastic binder systems, impact-elastic coatings, crack sealers, crack-covering membranes, liquid foils and other flexible epoxy systems that require strong adhesion, good toughness, high elongation and improved flexibility. Current product data describe ARADUR 75-1 with approximately 3,000-9,000 mPa·s viscosity at 25°C, an amine value of approximately 120-140 mg KOH/g, an active-hydrogen equivalent weight of approximately 250 g/eq, density around 0.97 g/cm³ and a flash point around 95°C. ARADUR 75-1 gives approximately 40 minutes gel time with ARALDITE GY 250 and approximately 58 minutes with ARALDITE GY 783 under current reference methods, while the documented optimum ARALDITE GY 783 / ARADUR 75-1 mix ratio is approximately 100:129 parts by weight.

PRODUCT IDENTITY

Product name: ARADUR 75-1
Product type: Epoxy curing agent / hardener
Chemical family: Polyamines
Specific chemistry: Formulated polyether-urethane polyamine
Physical form: Liquid
Appearance: Clear liquid
Color: Yellow in current safety-property description
Gardner color: Approximately ≤4 in high-performance selector literature
Viscosity at 25°C: Approximately 3,000-9,000 mPa·s in current product data
Historical high-performance selector viscosity: Approximately 3,000-5,500 mPa·s
Amine value: Approximately 120-140 mg KOH/g
Active hydrogen equivalent weight: Approximately 250 g/eq
Density at 20°C: Approximately 0.97 g/cm³
Flash point: Approximately 95°C by Pensky-Martens closed-cup testing
Reference gel time with ARALDITE GY 250: Approximately 40 minutes at 23°C, 250 g mass
Reference gel time with ARALDITE GY 783: Approximately 58 minutes at 23°C, 250 g mass
Reference glass-transition temperature: Maximum approximately -10°C when cured with ARALDITE GY 250
Optimum ARALDITE GY 783 / ARADUR 75-1 mix ratio: Approximately 100:129 parts by weight
Historical high-performance selector mix ratio: Approximately 100:129 parts by weight
Primary functions: Curing agent, hardener and crosslinking agent
Primary current end uses: Crack sealer, impact-elastic coatings, liquid foil and viscoelastic binder systems
Current product features: Excellent adhesion, fast cure, good elongation, good toughness, high elongation, high impact resistance, improved flexibility and medium viscosity
Current labeling claims: Bisphenol A-free, nonylphenol-free, Substances of Very High Concern chemicals-free and Volatile Organic Compound-free
Compatible resin examples: ARALDITE GY 250, ARALDITE GY 783 and ARALDITE GY 784
Documented substrate adhesion: Good adhesion to dry concrete and sand-blasted steel
Low-temperature capability: High degree of flexibility and system setting capability at temperatures in the region of -10°C, depending on formulation
Heat-stability relationship: ARADUR 75-1 provides a higher degree of stability than ARADUR 70 when exposed to heat
Low-solvent formulation capability: Suitable for extremely low-solvent binder systems
Mechanical balance: Satisfactory mechanical properties with ARALDITE GY 783 and GY 784; unmodified resins such as ARALDITE GY 250 can provide still higher stability with some reduction in flexibility
Storage temperature: Approximately 2-40°C
Storage condition: Dry place, preferably sealed original container, protected from direct sunlight
CAS Number: Proprietary formulated polyether-urethane polyamine 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: Variable / not applicable as one fixed value

Synonyms: ARADUR 75-1, Polyether-Urethane Polyamine, Polyether Urethane Polyamine, Formulated Polyether-Urethane Polyamine, Flexible Epoxy Hardener, Flexible Epoxy Curing Agent, Impact-Elastic Epoxy Hardener, Viscoelastic Binder Hardener, Crack-Sealer Hardener, Liquid-Foil Hardener, Crack-Bridging Epoxy Hardener, Flexible Membrane Epoxy Hardener, Medium-Viscosity Epoxy Hardener, High-Elongation Epoxy Hardener, Impact-Resistant Epoxy Hardener, Low-Temperature Flexible Epoxy Hardener, Polyamine Crosslinker

ARADUR 75-1 should be treated as a proprietary formulated curing-agent mixture rather than as one pure molecular substance. The exact commercial identity is most reliably represented by viscosity, amine value, active-hydrogen equivalent weight, density, cure profile and documented application performance. Formal component identity, concentration ranges, hazard classification and transport status should be taken from the current product-specific SDS.

WHAT IS ARADUR 75-1?

ARADUR 75-1 is a flexible epoxy hardener designed to create viscoelastic and impact-tolerant cured systems rather than conventionally rigid epoxy networks.
The grade uses polyether-urethane polyamine chemistry to combine reactive amine curing functionality with flexible organic segments that remain part of the cured network.
Compared with ARADUR 70, ARADUR 75-1 is substantially lower in viscosity and reacts faster while still providing strong flexibility and elongation.
Current product positioning focuses on crack sealers, impact-elastic coatings, liquid foils and viscoelastic binder systems.
The grade is especially useful where good adhesion to dry concrete or sand-blasted steel must be combined with flexibility, toughness and impact resistance.
ARADUR 75-1 also offers greater heat stability than ARADUR 70, making it useful where flexible performance must be retained over a broader temperature range.

POLYETHER-URETHANE POLYAMINE CHEMISTRY

Polyether-urethane polyamine chemistry combines flexible polyether segments, urethane-related structural units and reactive amine functionality.
The polyether portion contributes chain mobility and low-temperature flexibility.
Urethane-related structural features can contribute cohesive strength, toughness and intermolecular interaction.
Reactive amine groups open epoxy rings and chemically integrate the flexible hardener into the cured thermoset network.
Because the flexible segments become part of the crosslinked structure, ARADUR 75-1 can produce durable flexibility without relying solely on a mobile external plasticizer.
The product is a formulated commercial curing agent, so its exact molecular distribution should not be reduced to one invented molecular formula.

HOW EPOXY CURING WORKS

Epoxy resins contain reactive oxirane rings. Amine hydrogens in ARADUR 75-1 attack these rings and form carbon-nitrogen bonds together with hydroxyl groups.
Repeated reaction between multifunctional resin and multifunctional hardener creates a three-dimensional polymer network.
The flexible polyether-urethane segments become chemically incorporated as network segments while the epoxy groups provide crosslinking.
The resulting cured material can deform much more than a conventional rigid epoxy while retaining useful cohesive strength and adhesion.
Cure continues after gelation, so mechanical performance, chemical resistance and final flexibility develop progressively.
The exact balance between stiffness and flexibility depends strongly on resin type, hardener ratio and cure schedule.

MEDIUM VISCOSITY

Medium viscosity is a core current product feature.
Current product data give a viscosity range of approximately 3,000-9,000 mPa·s at 25°C.
A high-performance selector published a narrower historical range of approximately 3,000-5,500 mPa·s.
The current broader range should be used for present authority-page specification while older data remain useful for historical comparison.
ARADUR 75-1 is dramatically easier to process than ARADUR 70, whose viscosity is an order of magnitude higher.
The medium-viscosity profile supports pumping, mixing and low-solvent formulation while still providing sufficient body for flexible coatings and sealers.

AMINE VALUE

ARADUR 75-1 has an amine value of approximately 120-140 mg KOH/g.
This is higher than the amine value of ARADUR 70 and is consistent with greater reactive-amine concentration per unit mass.
The value is useful for incoming quality control and identity confirmation.
A significant shift can indicate dilution, contamination, aging or use of an incorrect material.
Amine value should not be used directly for stoichiometric calculation because total basic nitrogen and reactive amine-hydrogen equivalents are different concepts.
The approximately 250 g/eq AHEW is the relevant parameter for theoretical epoxy-equivalent calculations.

ACTIVE HYDROGEN EQUIVALENT WEIGHT

The active-hydrogen equivalent weight of ARADUR 75-1 is approximately 250 g/eq.
AHEW represents the mass of commercial hardener required to supply one equivalent of reactive amine hydrogen.
The value is much lower than the approximately 900 g/eq AHEW of ARADUR 70 and helps explain the lower hardener loading and faster cure of ARADUR 75-1.
For a resin with EEW 190 g/eq, simple theoretical stoichiometry gives approximately 131.6 parts ARADUR 75-1 per 100 parts resin.
This closely matches the documented optimum ARALDITE GY 783 / ARADUR 75-1 ratio of approximately 100:129 parts by weight.
The close agreement gives confidence that the 100:129 reference ratio reflects a near-stoichiometric flexible epoxy system for that resin platform.

DENSITY

Current product information gives a density of approximately 0.97 g/cm³ at 20°C.
High-performance selector literature gives the same approximate density at 25°C.
Density is useful for manufacturing calculations and conversion between mass and volume.
Stoichiometric metering should preferably be controlled by weight.
Volumetric dispensing equipment should be calibrated to actual product density and processing temperature.
Density can also provide a secondary incoming quality-control check when combined with viscosity and amine value.

FLASH POINT

Current product information gives a flash point of approximately 95°C by Pensky-Martens closed-cup testing.
This relatively high flash point reduces flammability concerns compared with low-boiling solvent-rich curing-agent solutions.
The product is still an organic reactive material and should be kept away from excessive heat and ignition sources.
Controlled heating can be used only where permitted by the current SDS and process design.
Fire response, transport and storage classification should follow the current product-specific SDS.

GEL TIME WITH ARALDITE GY 250

Current product data give an approximately 40-minute gel time with ARALDITE GY 250 at 23°C using a 250 g Tecam reference method.
High-performance selector literature also gives approximately 40 minutes under a 100 g reference method.
This consistency shows that ARADUR 75-1 has a moderate-fast cure profile with the unmodified liquid epoxy resin.
The gel time is far shorter than ARADUR 70 and supports faster turnaround.
Practical pot life can still be shorter than formal gel time where flow, coating quality or adhesive wetting must remain optimal.
The final formulation should therefore establish a maximum working time independently.

GEL TIME WITH ARALDITE GY 783

Current product data give an approximately 58-minute gel time with ARALDITE GY 783 at 23°C using a 250 g reference mass.
The longer gel time relative to ARALDITE GY 250 reflects the specific resin composition and formulation balance.
ARALDITE GY 783 is an important compatible flexible-system resin and is also the resin for which the documented optimum 100:129 mix ratio is provided.
The approximately 58-minute gel time can provide a useful application window for coatings, crack sealers and membranes.
Temperature, batch size, fillers and accelerators can change the practical processing window substantially.

GLASS-TRANSITION TEMPERATURE

Current product data give a glass-transition temperature of maximum approximately -10°C when ARADUR 75-1 is cured with ARALDITE GY 250.
A Tg in this region is consistent with a highly flexible cured network.
Below the glass transition of a rigid epoxy, material can become brittle, while a flexible system with a low Tg retains chain mobility at cold temperatures.
ARADUR 75-1 is therefore suitable for systems expected to deform or move at temperatures around or below normal room temperature.
The actual Tg depends on resin type, hardener ratio, cure and additives.
Fillers generally change modulus more strongly than Tg but can still influence apparent mechanical behavior at low temperature.

LOW-TEMPERATURE SETTING AND FLEXIBILITY

Current product data describe ARADUR 75-1 as providing a high degree of flexibility with system setting capability at temperatures in the region of -10°C.
This makes the grade relevant to construction and industrial systems exposed to cold ambient conditions.
Low-temperature cure should always be distinguished from full low-temperature property development because reaction slows as temperature falls.
A system that sets at low temperature may still require additional time to reach full chemical and mechanical properties.
Service qualification should therefore consider both cure temperature and final operating temperature.
Cold-condition adhesion to the actual substrate should also be validated.

EXCELLENT ADHESION

Excellent adhesion is a primary current product feature.
Current technical information specifically notes good adhesion to dry concrete and sand-blasted steel.
The flexible cured network can reduce stress concentration at the interface compared with a very rigid epoxy system.
Low-to-medium mixed viscosity also helps wet surface microtexture and blast profile.
Surface preparation remains critical because oil, weak concrete, dust and soluble salts can prevent intimate contact.
Adhesion should be evaluated after full cure and after relevant thermal, moisture or fatigue exposure.

GOOD TOUGHNESS

Good toughness is part of the current product positioning.
Toughness describes the ability of a material to absorb energy before fracture.
ARADUR 75-1 combines flexible chain segments with epoxy network formation so the cured material can deform while still carrying load.
This makes the grade useful for coatings and sealers subjected to impact, vibration or localized movement.
Toughness should not be confused with softness because a tough material can retain substantial strength while resisting crack propagation.
The final toughness depends on resin choice, filler content and cure state.

HIGH ELONGATION

High elongation and good elongation are current product features.
Elongation enables the cured material to accommodate substrate movement and deformation without immediate fracture.
This is important in crack-covering membranes, liquid foils and impact-elastic coatings.
ARADUR 75-1 offers a balance between the extreme flexibility of ARADUR 70 and higher thermal stability.
Unmodified rigid resins can increase stability but reduce elongation relative to resin systems specifically designed for flexibility.
Mechanical testing should be carried out on the complete formulation because fillers and pigment loading can reduce ultimate elongation.

HIGH IMPACT RESISTANCE

High impact resistance is a current product feature.
A flexible, tough epoxy network can absorb impact energy rather than failing immediately by brittle cracking.
This is useful in floors, protective coatings, membranes and repair systems exposed to dropped objects, vibration or deformation.
Impact resistance depends on film thickness and substrate support as well as on hardener chemistry.
Rigid fillers can increase abrasion resistance but can reduce impact flexibility at high loading.
The final system should therefore be tested using impact methods representative of actual service.

IMPROVED FLEXIBILITY

Improved flexibility is one of the defining reasons to select ARADUR 75-1.
The flexible polyether-urethane structure becomes part of the cured network and reduces brittleness.
Compared with ARADUR 70, ARADUR 75-1 provides a higher degree of thermal stability while retaining substantial flexibility.
This balance is useful where the service environment includes both mechanical movement and moderate heat.
The exact flexibility can be tuned by resin selection and by the proportion of hardener used.
Performance should be evaluated through tensile, elongation, impact and low-temperature testing where critical.

HEAT STABILITY COMPARED WITH ARADUR 70

Current technical information states that ARADUR 75-1 provides a higher degree of stability than ARADUR 70 when exposed to heat.
ARADUR 70 is designed for very high flexibility and has a very low glass-transition profile.
ARADUR 75-1 uses a different formulation balance that sacrifices some extreme flexibility in exchange for improved thermal stability.
This makes ARADUR 75-1 a stronger candidate where heat exposure would make an ultra-flexible ARADUR 70 system too soft.
The comparison should not be reduced to a single service-temperature limit because actual performance depends on resin type and cure.
Thermal mechanical analysis or heat-aging tests should be used for critical high-temperature flexible systems.

LOW-SOLVENT FORMULATION CAPABILITY

Current product information states that ARADUR 75-1 allows formulation of extremely low-solvent binder systems.
The medium viscosity is low enough to be practical while the hardener itself is currently labeled VOC-free.
Low-solvent technology can reduce emissions and improve dry-film build compared with conventional solvent-rich flexible coatings.
The complete formulation must still be reviewed because resin, additives or auxiliary solvents can introduce VOC.
Low-solvent coatings require attention to flow, air release and film thickness because there is less volatile carrier to reduce application viscosity.
ARADUR 75-1 is particularly useful where flexibility and low emissions must be combined.

VOC-FREE CLAIM

Current product labeling identifies ARADUR 75-1 as Volatile Organic Compound-free.
Formal use of the claim should rely on current product-specific documentation because VOC definitions can vary by jurisdiction and test method.
The claim applies to the commercial hardener and does not automatically make every final formulation VOC-free.
Epoxy resin, additives, thinners or cleaning agents can add volatile components to the complete system.
VOC-free hardener positioning is nevertheless valuable when designing low-solvent or low-emission flexible epoxy systems.

BISPHENOL A-FREE CLAIM

Current product labeling identifies ARADUR 75-1 as Bisphenol A-free.
This claim refers to the commercial hardener, not necessarily to the epoxy resin used with it.
ARALDITE GY 250, GY 783 or GY 784 resin systems must be assessed independently for their own chemical composition.
A finished epoxy formulation should therefore not be labeled Bisphenol A-free solely because the hardener carries that claim.
Formal customer declarations should rely on current product-specific compliance documentation.

NONYLPHENOL-FREE CLAIM

Current product labeling identifies ARADUR 75-1 as nonylphenol-free.
Nonylphenol is used in some historical curing-agent technologies as a modifier or accelerator, so its absence is relevant to modern restricted-substance programs.
The claim applies to the hardener itself.
Other formulation ingredients should be checked separately.
Formal regulatory declarations should use current product-specific documentation.

SVHC-CHEMICALS-FREE CLAIM

Current product labeling identifies ARADUR 75-1 as Substances of Very High Concern chemicals-free.
Candidate lists can change, so formal regulatory use of this claim should be based on current compliance documentation.
The final coating, membrane or adhesive must be assessed independently because other raw materials can introduce substances not present in the hardener.
The claim should not be converted automatically into a blanket compliance statement for every market.

APPLICATIONS

Viscoelastic binder systems
Viscoelastic binder systems are a primary current end use. ARADUR 75-1 chemically combines flexibility and epoxy crosslinking to create binders that deform under load while retaining useful cohesion.

Impact-elastic coatings
Impact-elastic coatings are a primary current application. The grade can absorb mechanical shock more effectively than a conventional rigid epoxy hardener.

Crack sealers
Crack sealer is a primary current end use. ARADUR 75-1 can be formulated into flexible epoxy systems that bond to crack faces while tolerating limited movement.

Crack-covering membranes
Current technical information specifically identifies crack-covering membranes as an application. Flexible cure allows the membrane to bridge limited substrate movement.

Liquid foils
Liquid foil is a primary current end use. ARADUR 75-1 can be used in flexible liquid-applied membrane systems designed to form a continuous cured barrier.

Flexible waterproofing systems
Low-solvent flexible epoxy can be used in waterproofing membranes where the complete system has been tested for crack bridging and water resistance.

Protective membranes
Flexible protective layers can tolerate limited movement better than rigid films.

Concrete crack-bridging coatings
Dry concrete surfaces can use flexible coatings designed to bridge small non-structural crack movement.

Dry-concrete sealers
Current product data specifically support good adhesion to dry concrete, making compatible sealer systems technically relevant.

Concrete protective coatings
Flexible binders can protect concrete where impact, movement or thermal cycling would challenge a brittle coating.

Sand-blasted steel coatings
Current product data specifically support good adhesion to sand-blasted steel.

Flexible steel coatings
Steel panels, machinery and structures can use flexible epoxy coatings where vibration or impact is expected.

Impact-resistant floor coatings
Industrial floors exposed to dropped objects can use compatible ARADUR 75-1 systems where impact tolerance is more important than maximum rigid hardness.

Flexible industrial flooring
Factories and workshops can use flexible binder systems where vibration, thermal cycling or substrate movement must be accommodated.

Cold-storage coatings
Low-temperature setting and Tg around -10°C make ARADUR 75-1 relevant to selected cold-storage and refrigerated-service coatings.

Refrigerated-area flooring
Flexible floor systems can be evaluated where cold conditions would embrittle conventional epoxy.

Flexible base coats
Flexible base layers can reduce stress transfer between concrete or steel and subsequent coating layers.

Vibration-resistant coatings
Machinery and equipment exposed to vibration can benefit from a tougher, more deformable cured network.

Machine coatings
Machine frames and housings can use flexible protective coatings where impact and vibration are present.

Equipment coatings
Industrial equipment can use impact-elastic epoxy systems where rigid coatings would be prone to cracking.

Marine maintenance coatings
Prepared steel can use flexible epoxy systems where impact and movement tolerance are needed, subject to corrosion and water-resistance testing.

Deck coatings
Selected deck or platform systems can use impact-tolerant epoxy where movement and mechanical shock are expected.

Flexible repair compounds
Repair formulations can use ARADUR 75-1 where substrate movement would crack a conventional rigid repair.

Crack repair adhesives
ARADUR 75-1 can be used in flexible crack-repair adhesive formulations where limited movement must be tolerated.

Metal bonding
Prepared steel and aluminum can be bonded with flexible epoxy where peel and impact performance are important.

Concrete-to-metal bonding
Flexible adhesive formulations can reduce interfacial stress between materials with different stiffness and thermal expansion.

Composite bonding
Flexible epoxy adhesive can reduce stress concentration at composite-to-metal or composite-to-composite interfaces.

Wood bonding
Flexible cure can accommodate dimensional movement in wood better than highly rigid adhesives in selected applications.

Film adhesives
Although not the principal current end-use label, ARADUR 75-1 chemistry is technically relevant to flexible film-type adhesive systems where controlled 
formulation is used.

Flexible sealants
ARADUR 75-1 can be formulated into sealant-like epoxy systems that require adhesion, toughness and movement tolerance.

Industrial sealants
Flexible epoxy sealers can be used around rigid construction details where movement remains limited and predictable.

Liquid-applied membranes
The liquid-foil positioning directly supports liquid-applied flexible membrane technology.

Secondary containment membranes
Flexible barrier layers can be evaluated for selected containment applications after chemical-resistance testing.

Flexible tank-lining systems
ARADUR 75-1 can be evaluated where a tank lining requires more deformation tolerance than a conventional rigid epoxy, subject to full immersion 
qualification.

High-impact primers
Flexible primers can reduce stress at the substrate interface under impact or vibration.

Low-solvent coatings
ARADUR 75-1 is specifically suitable for extremely low-solvent binder systems.

High-solids flexible coatings
The medium-viscosity hardener can support high-solids flexible protective systems where film build and impact tolerance are required.

Low-emission flexible coatings
VOC-free hardener labeling supports lower-emission formulation strategies when the remaining raw materials are also selected appropriately.

Cold-curing flexible systems
Current technical information indicates setting capability at temperatures around -10°C depending on the complete formulation.

Flexible mastics
Thixotropic mastics can use ARADUR 75-1 when non-sag rheology is added.

Joint-adjacent repair systems
Flexible repair compounds can be used near movement zones where a rigid patch would concentrate stress, although true movement joints require dedicated 
sealant design.

Traffic-area coatings
Flexible coatings can absorb mechanical shock from carts, wheels and dropped objects.

Loading-dock coatings
Impact-elastic epoxy can be evaluated in loading areas where both adhesion and mechanical toughness are required.

Workshop floors
Workshop coatings can benefit from toughness and impact resistance where dropped tools or vibration are expected.

Transportation-component coatings
Flexible epoxy can be evaluated on components exposed to vibration and thermal cycling.

Fatigue-resistant adhesive systems
Flexible bond lines can reduce peak cyclic stress and improve durability in suitable geometries.

Thermal-cycling protective systems
ARADUR 75-1 is useful where substrates repeatedly expand and contract with temperature change.

General flexible epoxy systems
Other uses are possible where improved flexibility, elongation, impact resistance and adhesion are required without the extreme viscosity and lower heat stability of ARADUR 70.

ARALDITE GY 783 REFERENCE SYSTEM

ARALDITE GY 783 is a key reference resin for ARADUR 75-1.
Current product information gives an optimum ARALDITE GY 783 / ARADUR 75-1 mix ratio of approximately 100:129 parts by weight.
The current 250 g reference gel time is approximately 58 minutes at 23°C.
The documented ratio is close to simple theoretical stoichiometry based on an AHEW of 250 g/eq and a typical low-viscosity construction resin EEW near the usual liquid-epoxy range.
The GY 783 system provides satisfactory mechanical properties together with useful flexibility.
This pairing is especially relevant to viscoelastic binders, crack-covering membranes and impact-elastic coating systems.

ARALDITE GY 784 COMPATIBILITY

ARALDITE GY 784 is another liquid epoxy resin specifically identified as compatible with ARADUR 75-1.
Current product data describe satisfactory mechanical performance with ARALDITE GY 783 and GY 784 systems.
The exact hardener ratio should be calculated from the actual resin EEW or taken from current resin-specific technical guidance.
A GY 783 ratio should not be transferred automatically to GY 784 without verification.
Final formulation should be tested for elongation, adhesion, impact resistance and heat stability.

ARALDITE GY 250 COMPATIBILITY

ARALDITE GY 250 is an unmodified liquid epoxy resin and is also a key reference system for ARADUR 75-1.
Current product data give approximately 40 minutes gel time at 23°C with this resin.
Current technical information notes that unmodified resins such as ARALDITE GY 250 can provide even higher stability than GY 783 or GY 784 systems, but with some reduction in flexibility.
This makes GY 250 useful when a formulator needs a firmer, more mechanically stable flexible epoxy.
The tradeoff between flexibility and stability should be evaluated through tensile, elongation, impact and thermal testing.

COMPARISON WITH ARADUR 70

ARADUR 70 and ARADUR 75-1 are both polyether-urethane amine curing agents designed for flexible epoxy systems.
ARADUR 70 has much higher viscosity, approximately 16,000-27,000 mPa·s, compared with approximately 3,000-9,000 mPa·s for ARADUR 75-1.
ARADUR 70 has an AHEW around 900 g/eq, while ARADUR 75-1 has an AHEW around 250 g/eq.
ARADUR 70 provides extremely high flexibility and very long standardized gel time, while ARADUR 75-1 cures much faster and is easier to process.
Current technical information specifically states that ARADUR 75-1 provides a higher degree of stability than ARADUR 70 when exposed to heat.
ARADUR 75-1 is therefore the better balance where flexibility, processability and heat stability must coexist.

MIX-RATIO CALCULATION

Theoretical hardener demand can be estimated using the equation parts hardener per 100 parts resin = 100 × AHEW / resin EEW.
With ARADUR 75-1 AHEW approximately 250 g/eq and a resin EEW of 190 g/eq, the theoretical level is approximately 131.6 parts hardener.
At resin EEW 185 g/eq, the theoretical level is approximately 135.1 parts.
At EEW 200 g/eq, the theoretical value is approximately 125 parts.
The documented ARALDITE GY 783 / ARADUR 75-1 ratio of 100:129 lies close to this theoretical range.
Validated resin-specific data should always take precedence over generic calculation.

EFFECT OF HARDENER RATIO

Too little ARADUR 75-1 can leave unreacted epoxy functionality and produce a harder, more rigid but incompletely cured network.
Too much hardener can leave residual amine functionality and increase softness, polarity or water sensitivity.
The ratio also influences flexibility because ARADUR 75-1 provides a substantial portion of the flexible network structure.
Reducing hardener far below stoichiometry can therefore reduce the intended viscoelastic character.
Increasing hardener beyond the validated range can lower modulus excessively and reduce chemical resistance.
Ratio changes should be supported by mechanical and chemical testing.

POT LIFE

Current reference gel times of approximately 40 minutes with ARALDITE GY 250 and 58 minutes with ARALDITE GY 783 provide a practical but finite working window.
Practical pot life can be shorter when the application requires low viscosity, smooth film formation or good substrate wetting.
Warm conditions shorten working time.
Large mixed masses can self-heat and advance faster than thin applied films.
Only the quantity that can be applied within the validated working period should be mixed.
Material beyond its practical pot life should not be restored with solvent or fresh hardener.

EXOTHERM CONTROL

Epoxy-amine cure releases heat.
ARADUR 75-1 reacts faster than ARADUR 70 and can produce substantial exotherm in large mixed masses.
Flexible membrane coatings are usually applied in thin enough layers for heat to dissipate effectively.
Potting or thick adhesive masses require more careful exotherm assessment.
Mineral fillers can moderate temperature rise but also influence flexibility.
Batch size and section thickness should be validated before production scale-up.

TEMPERATURE EFFECTS

Warm ARADUR 75-1 becomes less viscous and easier to mix, but the epoxy reaction also accelerates.
Cold conditions increase viscosity and slow cure.
Current technical information supports system setting in the region of -10°C, depending on formulation.
At low temperature, more time may be required to develop final mechanical and chemical properties.
At elevated temperature, ARADUR 75-1 provides greater stability than ARADUR 70, but the exact service limit depends on the resin and cure.
Qualification should include the intended cure and service temperature range.

CRACK-COVERING MEMBRANES

Crack-covering membranes are a specifically documented ARADUR 75-1 application.
A successful crack-covering membrane must combine adhesion to the substrate with enough elongation to bridge limited movement.
ARADUR 75-1 provides flexible network structure and impact toughness while maintaining epoxy adhesion.
Membrane thickness strongly affects crack-bridging capacity.
The crack movement amplitude and temperature must be included in qualification testing.
Structural cracks or active joints with large movement require dedicated engineering solutions and should not rely on a generic flexible epoxy membrane alone.

LIQUID FOILS

Liquid foil is a primary current end use.
A liquid foil is applied as a continuous wet membrane and cures into a seamless flexible barrier.
ARADUR 75-1 provides the toughness and flexibility needed for membrane movement tolerance.
Substrate preparation and pinhole control are critical because a thin defect can compromise barrier continuity.
Film thickness should be controlled across edges, corners and details.
Waterproofing or containment claims should be validated on the full membrane system.

VISCOELASTIC BINDERS

Viscoelastic binder systems are a primary application of ARADUR 75-1.
Viscoelastic behavior combines elastic recovery with time-dependent deformation and energy dissipation.
This can improve damping of vibration and impact compared with a rigid thermoset.
The balance depends strongly on the epoxy resin and cure ratio.
ARADUR 75-1 allows formulators to create a network that remains cohesive while dissipating mechanical energy.
Dynamic mechanical analysis can be used to characterize storage modulus, loss modulus and damping over temperature.

IMPACT-ELASTIC COATINGS

Impact-elastic coatings are a primary current end use.
These coatings deform under impact rather than fracturing immediately.
ARADUR 75-1 provides both toughness and elongation, which can reduce brittle chipping and cracking.
The coating should still be hard enough to resist wear and indentation for the intended service.
Filler and pigment loading should therefore be balanced carefully.
Impact testing should be carried out at both room temperature and any critical low service temperature.

CRACK SEALERS

Crack sealer is a primary current end use.
The low-to-medium viscosity allows ARADUR 75-1 systems to wet crack faces while the flexible cured network tolerates limited movement.
Cracks should be clean and structurally evaluated before treatment.
A flexible crack sealer is appropriate only where expected movement remains within the capability of the formulation.
Active structural movement can exceed the strain capacity of even a highly flexible epoxy.
Bond strength and cyclic crack movement should therefore be validated where critical.

DRY CONCRETE ADHESION

Good adhesion to dry concrete is specifically documented.
Concrete should be sound and free from weak laitance, dust, oil and curing compounds.
Mechanical preparation can expose sound substrate and improve surface profile.
Flexible cure can reduce stress concentration at the interface during movement or thermal cycling.
Concrete moisture should still be evaluated because the documented statement refers specifically to dry concrete.
Wet or saturated concrete should not be assumed suitable without a qualified wet-substrate formulation.

SAND-BLASTED STEEL ADHESION

Good adhesion to sand-blasted steel is specifically documented.
Abrasive blasting removes rust and scale while creating a surface profile that promotes mechanical interlocking.
Residual salts, grease or dust can still reduce adhesion.
Flexible cure can tolerate vibration and deformation of metal better than a very rigid coating.
Corrosion resistance depends on the complete primer and coating system rather than adhesion alone.
Salt-spray or cyclic-corrosion testing should be used where severe protective service is intended.

FILLERS AND AGGREGATES

Mineral fillers can be incorporated into ARADUR 75-1 systems where needed for cost, body, abrasion resistance or dimensional control.
Silica, quartz, calcium carbonate, barytes, talc and mica are examples of classes that can be evaluated.
Rigid filler generally reduces elongation as loading increases.
Crack-covering and membrane systems should therefore limit filler to levels compatible with required flexibility.
Impact-resistant floor systems can use hard mineral aggregate to increase wear resistance.
The final mechanical balance should be tested rather than inferred from neat binder properties.

PIGMENTS

Compatible pigments can be used in impact-elastic coatings and flexible membranes.
Pigment volume affects modulus, elongation and barrier performance.
Very high pigment volume can make a flexible binder more brittle.
Pigment surface chemistry can also affect cure and dispersion.
The final formulation should be checked for color stability, flexibility, adhesion and pot life.
Exterior color retention should be evaluated separately because conventional epoxy resin remains UV-sensitive.

RHEOLOGY CONTROL

ARADUR 75-1 has medium viscosity and may require different rheology strategies depending on application.
Liquid foils and membranes need enough structure to maintain film thickness on vertical or inclined areas.
Crack sealers may require lower viscosity for penetration.
Impact-elastic floors need a balance between leveling and filler suspension.
Fumed silica, organoclays and compatible polymeric thixotropes can be evaluated.
Excessive thixotropy can reduce flow, wetting and membrane continuity.

MIXING

ARADUR 75-1 should be mixed thoroughly with the selected epoxy resin until a uniform composition is obtained.
The medium viscosity makes mixing easier than with ARADUR 70 but still requires adequate mixer power.
Vessel walls and bottom should be scraped to avoid unmixed zones.
Air incorporation should be minimized.
For filled formulations, resin and hardener should normally be homogenized before heavy filler addition unless a validated manufacturing procedure specifies another sequence.
The mixed material should be applied within the validated pot-life period.

DEFOAMING AND AIR RELEASE

Flexible membranes and coatings require good air release because pinholes can reduce barrier performance.
Medium viscosity can retain some mixing air, especially in highly filled systems.
Compatible defoamers can improve surface quality.
Excessive defoamer can cause craters or reduce adhesion.
Vacuum deaeration can be useful for selected adhesive or casting applications.
Application temperature should be controlled because warm material releases air more easily but also cures faster.

CHEMICAL RESISTANCE

Chemical resistance depends on the full resin-hardener network.
Flexible epoxy systems generally have lower crosslink density than rigid high-Tg systems, which can change solvent uptake.
ARADUR 75-1 can nevertheless provide useful resistance to water, oils, cleaners and selected industrial chemicals in suitable formulations.
Unmodified resin such as ARALDITE GY 250 can provide higher stability but with reduced flexibility.
Aggressive solvents, acids, oxidizers and hot immersion require direct testing.
Chemical resistance should never be inferred from flexibility or adhesion alone.

WATER RESISTANCE

Water resistance is formulation dependent.
Current product data support good adhesion to dry concrete but do not justify a blanket wet-substrate or immersion claim.
Full cure should be developed before severe water exposure unless the system is specifically qualified otherwise.
Polyether-rich flexible networks can interact differently with moisture than rigid high-crosslink-density epoxies.
Resin selection and cure completeness therefore matter strongly.
Water immersion, hydrostatic exposure and wet-dry cycling should be tested separately.

FATIGUE AND VIBRATION

ARADUR 75-1 is highly relevant to fatigue- and vibration-resistant systems because of its toughness and flexibility.
A flexible bond line or coating can distribute cyclic strain over a larger volume.
This can reduce peak stress and slow crack initiation.
The benefit depends on joint geometry, film thickness and substrate stiffness.
Dynamic or cyclic mechanical testing should be used for critical machinery and transportation applications.
Heat stability superior to ARADUR 70 can be advantageous where vibration occurs at elevated service temperature.

THERMAL CYCLING

Thermal cycling repeatedly expands and contracts substrates.
Different materials can move by different amounts over the same temperature change.
A rigid epoxy can concentrate stress at the interface and crack.
ARADUR 75-1 provides a more compliant network that can accommodate greater strain.
Low-temperature flexibility and improved heat stability give the grade a useful balance across a broad thermal cycle.
Qualification should reproduce the actual minimum temperature, maximum temperature and number of cycles expected in service.

WEATHERING

ARADUR 75-1 provides flexibility and toughness but does not remove the inherent ultraviolet limitations of conventional epoxy resin.
Exterior exposure can cause yellowing, chalking and gloss loss.
Flexible waterproofing systems exposed to sunlight may require a UV-resistant finish layer.
The hardener's Bisphenol A-free and VOC-free labeling claims do not imply exterior color stability.
Weathering should be evaluated on the complete coating or membrane system.

QUALITY CONTROL

Important ARADUR 75-1 quality-control parameters include appearance, viscosity, amine value, AHEW, density, color and functional gel behavior.
Current viscosity is approximately 3,000-9,000 mPa·s at 25°C and amine value approximately 120-140 mg KOH/g.
AHEW is approximately 250 g/eq and density approximately 0.97 g/cm³.
Current reference gel times are approximately 40 minutes with ARALDITE GY 250 and 58 minutes with ARALDITE GY 783.
High-performance selector literature gives Gardner color ≤4.
A functional resin cure test can provide a useful application-level quality check when flexible performance is critical.

WHY VISCOSITY MATTERS

The medium viscosity of ARADUR 75-1 is one of its major advantages relative to ARADUR 70.
Lower viscosity improves transfer, metering, mixing and low-solvent formulation.
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 25°C when compared with the published current range.

WHY AHEW MATTERS

The approximately 250 g/eq AHEW determines theoretical hardener demand.
This value is much lower than ARADUR 70 and enables a much lower hardener loading.
Theoretical calculation with a resin EEW around 190 g/eq gives approximately 132 phr.
The documented GY 783 reference ratio of 129 phr is close to this result.
Using the AHEW of another flexible hardener would create a substantial formulation error.

WHY GEL TIME MATTERS

Gel time defines the relative reactivity of the hardener-resin system under controlled conditions.
ARADUR 75-1 gives about 40 minutes with GY 250 and 58 minutes with GY 783 under current reference methods.
The difference demonstrates that resin chemistry affects working time significantly.
Practical pot life should be measured directly on the final formulation.
Large batch mass and elevated temperature can shorten application time substantially.

COMPARISON WITH ARADUR 76

ARADUR 75-1 and ARADUR 76 are both flexible polyamine hardeners with AHEW around 250 g/eq.
ARADUR 75-1 is more viscous and is specifically described as a polyether-urethane polyamine.
ARADUR 76 is lower in viscosity and is positioned for two-component flexible membranes, adhesives, flooring and sealants.
ARADUR 75-1 offers the documented combination of impact-elastic coating performance, crack-covering membrane use and higher thermal stability than ARADUR 70.
The two grades should therefore be selected according to process viscosity, cure speed and required flexibility rather than treated as interchangeable.

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 composition disclosure, hazards, first aid, firefighting, transport, storage and disposal.
The Certificate of Analysis provides batch-specific controlled values where supplied.
Current product information supports the 3,000-9,000 mPa·s viscosity, 120-140 mg KOH/g amine value, 0.97 g/cm³ density, 95°C flash point, 40-minute GY 250 gel time, 58-minute GY 783 gel time, maximum -10°C Tg with GY 250 and 100:129 GY 783 mix ratio.
Current product information also supports excellent adhesion, fast cure, good elongation, toughness, high impact resistance, improved flexibility and medium-viscosity positioning.
Where historical selector values differ slightly from current product data, the current product-specific values should take precedence.

SAFETY AND HANDLING

ARADUR 75-1 is a reactive amine curing agent and should be handled according to the current product-specific SDS.
Direct skin and eye contact should be avoided.
Chemical-resistant gloves, suitable eye protection and protective clothing should be selected through workplace risk assessment.
Good general ventilation and local exhaust should be used where mist, aerosol or vapor can be generated.
The approximately 95°C flash point reduces but does not eliminate fire risk.
All handling, transfer, mixing and cleanup procedures should follow the current SDS.

FIRST AID

After skin contact, contaminated skin should be washed promptly according to current SDS guidance and contaminated clothing should be removed.
If product enters the eyes, immediate prolonged rinsing with clean water should begin and medical attention should be obtained according to the SDS.
If mist or aerosol is inhaled and symptoms occur, move the affected person to fresh air and obtain appropriate medical advice.
After accidental ingestion, follow the current product-specific SDS and professional medical guidance.

SPILL MANAGEMENT

Spilled ARADUR 75-1 can create a slippery surface and should be contained promptly.
Personnel should use suitable PPE and ventilate the affected area.
Compatible absorbent can be used for smaller spills, while larger releases may require pumping or specialized response.
The material should be prevented from entering drains, soil, groundwater or natural waterways.
Recovered liquid and contaminated absorbent should be placed in suitable labeled waste containers.
Spill response should follow the current product-specific SDS.

FIRE RESPONSE

ARADUR 75-1 has a current flash point of approximately 95°C by closed-cup testing.
The material can burn or decompose under severe heating.
Ignition sources should be controlled during storage and processing.
Thermal decomposition can generate hazardous fumes.
Firefighters may require self-contained breathing apparatus and appropriate protective equipment.
Extinguishing media and emergency procedures should follow the current SDS and facility fire plan.

STORAGE

Current product guidance specifies dry storage, preferably in the sealed original container, at approximately 2-40°C.
The product should not be stored in direct sunlight.
Containers should remain tightly closed to prevent contamination and uncontrolled exposure to moisture or atmospheric carbon dioxide.
Low storage temperature can increase viscosity, so the material should be allowed to reach an appropriate processing temperature before use.
The expiry date on the original container and current product-specific documentation should control shelf-life decisions.

REGULATORY CONSIDERATIONS

ARADUR 75-1 is a proprietary formulated polyether-urethane polyamine curing agent.
Current labeling claims include Bisphenol A-free, nonylphenol-free, Substances of Very High Concern chemicals-free and Volatile Organic Compound-free.
Current product information lists chemical-inventory status for ENCS, IECSC, TCSI and TSCA.
Formal regulatory use of these claims should rely on current product-specific documentation because requirements and candidate lists can change.
Generic suitability for coatings, crack sealers, membranes or adhesives does not establish approval for food contact, potable water, medical devices or other specialized regulated uses.
The finished formulation must be assessed separately because compliance depends on all raw materials.

ENVIRONMENTAL CONSIDERATIONS

VOC-free hardener positioning can support lower-emission flexible epoxy systems.
Uncured amine-containing hardener should nevertheless not be released directly to soil, drains or surface water.
Cleaning waste can contain resin, hardener, fillers, pigments and cleaning media and should be managed appropriately.
Large quantities of mixed resin and hardener can generate heat during cure and should not be accumulated in uncontrolled waste containers.
Flexible membranes and liquid foils should be applied carefully to minimize uncured material release.
Fully cured epoxy has different mobility and reactivity from uncured components, but disposal requirements remain jurisdiction-specific.

COMMON FORMULATION PROBLEMS

Mixture is too viscous
Low temperature, high filler loading or resin selection can make the system difficult to process. Condition materials appropriately and review compatible resin or reactive-diluent options.

Pot life is shorter than expected
Warm components, large batch size or accelerators can shorten the working window. Reduce batch size and standardize temperature.

Coating is too rigid
A rigid resin, insufficient ARADUR 75-1 or excessive mineral filler can reduce flexibility. Rebalance the formulation and test elongation.

Coating is too soft
Excessive hardener, low-crosslink-density resin or incomplete cure can reduce modulus. Verify stoichiometry and cure schedule.

Crack-bridging membrane tears
Film thickness, filler loading or formulation stiffness may be unsuitable. Increase flexible binder fraction and validate cyclic crack movement.

Liquid foil shows pinholes
Entrained air, porous-substrate outgassing or poor application technique can create defects. Improve deaeration, priming and film continuity.

Poor adhesion to concrete
Weak laitance, dust, oil or moisture can prevent bonding. Prepare the substrate and remember that documented adhesion refers specifically to dry concrete.

Poor adhesion to steel
Residual salts, oil or insufficient blast profile can reduce adhesion. Improve steel preparation before changing chemistry.

Low impact resistance
Excessive rigid filler, insufficient flexible hardener or low film thickness can reduce impact tolerance. Rebalance the system.

Poor low-temperature flexibility
Rigid resin, off-ratio cure or excessive filler can suppress cold flexibility. Test the full system at the target low temperature.

Poor heat stability
ARADUR 75-1 is more heat-stable than ARADUR 70, but very flexible systems still soften at elevated temperature. Increase system stability through validated 
resin selection rather than overcuring.

Low chemical resistance
Flexible low-Tg networks can have different solvent uptake than rigid epoxies. Use a more chemically resistant resin or adjust network balance and test the 
actual exposure.

Excessive exotherm
Large mixed masses can self-heat. Reduce batch size and validate thick sections separately.

Air entrapment
Medium viscosity can hold mixing air in filled formulations. Use controlled mixing, suitable defoamer or vacuum deaeration where appropriate.

Filler settlement
Low-solids flexible coatings can allow dense fillers to settle. Improve low-shear rheology without making the membrane too rigid.

Membrane sags on vertical surfaces
Insufficient thixotropy can cause sag. Add compatible rheology control while preserving crack-bridging flexibility.

System yellows outdoors
Conventional epoxy resin can yellow under UV exposure. Use a compatible weather-resistant finish if appearance matters.

Water exposure causes whitening
Early water exposure or insufficient cure can affect appearance and properties. Allow adequate cure and validate immersion resistance.

Incorrect GY 783 mix ratio
Use the documented ARALDITE GY 783 / ARADUR 75-1 ratio of approximately 100:129 by weight unless current product-specific guidance states otherwise.

ARADUR 75-1 confused with ARADUR 70
The two products differ greatly in viscosity, AHEW, cure speed and heat stability. Do not substitute one using the other's formulation ratio.

FREQUENTLY ASKED QUESTIONS

What is ARADUR 75-1?
ARADUR 75-1 is a medium-viscosity formulated polyether-urethane polyamine epoxy curing agent designed for flexible, tough and impact-elastic epoxy systems.

What is the viscosity?
Current product data give approximately 3,000-9,000 mPa·s at 25°C.

What is the amine value?
Approximately 120-140 mg KOH/g.

What is the active hydrogen equivalent weight?
Approximately 250 g/eq.

What is the density?
Approximately 0.97 g/cm³ at 20°C.

What is the flash point?
Approximately 95°C by Pensky-Martens closed-cup testing.

What is the gel time with ARALDITE GY 250?
Approximately 40 minutes at 23°C under the current 250 g reference method.

What is the gel time with ARALDITE GY 783?
Approximately 58 minutes at 23°C under the current 250 g reference method.

What is the documented ARALDITE GY 783 mix ratio?
Approximately 100 parts ARALDITE GY 783 to 129 parts ARADUR 75-1 by weight.

What is the reference glass-transition temperature?
Maximum approximately -10°C when cured with ARALDITE GY 250.

What are the main applications?
Crack sealers, impact-elastic coatings, liquid foils, viscoelastic binder systems and crack-covering membranes are principal applications.

Can ARADUR 75-1 be used at low temperature?
Current technical information indicates high flexibility and system setting capability at temperatures in the region of -10°C depending on formulation.

Does ARADUR 75-1 adhere to concrete?
Yes. Good adhesion to dry concrete is specifically documented.

Does ARADUR 75-1 adhere to steel?
Yes. Good adhesion to properly sand-blasted steel is specifically documented.

Can ARADUR 75-1 be used in low-solvent systems?
Yes. Current technical information specifically states that extremely low-solvent binder systems can be formulated.

Is ARADUR 75-1 more heat stable than ARADUR 70?
Yes. Current technical information states that ARADUR 75-1 provides a higher degree of stability than ARADUR 70 when exposed to heat.

Is ARADUR 75-1 more flexible than ARADUR 70?
ARADUR 70 is positioned for even higher flexibility, while ARADUR 75-1 offers a better balance of flexibility, easier processing, faster cure and greater heat stability.

Which epoxy resins are specifically associated with ARADUR 75-1?
ARALDITE GY 250, GY 783 and GY 784 are specifically identified as compatible liquid epoxy resins.

Is ARADUR 75-1 Bisphenol A-free?
Current product labeling identifies the hardener as Bisphenol A-free.

Is ARADUR 75-1 nonylphenol-free?
Yes. Current product labeling identifies the grade as nonylphenol-free.

Is ARADUR 75-1 VOC-free?
Current product labeling identifies the commercial hardener as Volatile Organic Compound-free; the complete formulation must still be assessed separately.

Is ARADUR 75-1 SVHC-chemicals-free?
Current product labeling identifies the grade as Substances of Very High Concern chemicals-free.

Is ARADUR 75-1 a pure substance?
No. It should be treated as a proprietary formulated curing-agent mixture.

Does ARADUR 75-1 have one universal CAS number?
No. The complete commercial formulation should not be assigned one universal CAS number without the current product-specific SDS.

How should ARADUR 75-1 be stored?
Store it dry, preferably in the sealed original container, at approximately 2-40°C and protect it from direct sunlight.

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 75-1 is a medium-viscosity formulated polyether-urethane polyamine epoxy curing agent designed for flexible, tough and impact-elastic epoxy systems.
Current product data specify approximately 3,000-9,000 mPa·s viscosity at 25°C, 120-140 mg KOH/g amine value, approximately 250 g/eq active-hydrogen equivalent weight, density around 0.97 g/cm³ and flash point around 95°C.

Current reference gel time is approximately 40 minutes with ARALDITE GY 250 and approximately 58 minutes with ARALDITE GY 783 at 23°C.
The documented optimum ARALDITE GY 783 / ARADUR 75-1 ratio is approximately 100:129 parts by weight.
The reference glass-transition temperature is maximum approximately -10°C when cured with ARALDITE GY 250.
Current product features include excellent adhesion, fast cure, good elongation, good toughness, high elongation, high impact resistance, improved flexibility and medium viscosity.
Current end-use positioning includes crack sealers, impact-elastic coatings, liquid foils and viscoelastic binder systems, while technical information also specifically identifies crack-covering membranes.

ARADUR 75-1 provides good adhesion to dry concrete and sand-blasted steel.
The product can be used with ARALDITE GY 250, GY 783 and GY 784 liquid epoxy resins.
Systems based on GY 783 and GY 784 provide a useful flexibility-mechanical-property balance, while unmodified GY 250 can provide higher stability with some reduction in flexibility.
ARADUR 75-1 provides a higher degree of stability than ARADUR 70 when exposed to heat.

Compared with ARADUR 70, ARADUR 75-1 is much lower in viscosity, much lower in AHEW and much faster in cure.
ARADUR 70 remains the more extreme flexibility option, while ARADUR 75-1 offers easier processing and a better balance of flexibility and thermal stability.
Current product information states that extremely low-solvent binder systems can be formulated with ARADUR 75-1.
Current labeling claims identify the commercial hardener as Bisphenol A-free, nonylphenol-free, Substances of Very High Concern chemicals-free and Volatile Organic Compound-free.

The simple theoretical hardener requirement at resin EEW 190 g/eq is approximately 132 phr, closely matching the documented GY 783 ratio of 129 phr.
Flexible membrane and crack-covering performance depends on the complete resin, filler, film-thickness and application design rather than the hardener alone.
ARADUR 75-1 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 75-1 technical specifications, application guidance, TDS, SDS, COA and formulation support, contact Ataman Chemicals with the intended epoxy resin, target flexibility, substrate, service temperature, batch size and required cure profile.

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