PRODUCTS

ARADUR 125

Aradur 125 provides long working times, non-tacky films after pre-reaction, and a very high degree of corrosion protection.
Aradur 125 offers very good adhesion and flexibility when used in combination with solid epoxy resins or their solutions for cold-curing and solvent-containing coatings.
Aradur 125 is widely employed as a curing agent in epoxy resin systems developed for structural, industrial, electrical, and composite applications.

CAS Number: Not assigned (mixture)
EC Number: Not assigned (mixture)
Molecular Formula: Not applicable (mixture)
Molecular Weight: Not applicable (mixture)

SYNONYMS:
ARADUR® 125, Aradur 125 Epoxy Hardener, ARADUR 125 Curing Agent, Epoxy Resin Hardener ARADUR 125, Epoxy Crosslinking Agent, Epoxy Curing Agent, Amine-Based Epoxy Hardener (general description)

Aradur 125 is a high – viscosity Polyamidoamine hardener is suitable for the cold curing, solvent – containing coatings for the application to steel and mineral substrates.
Aradur 125 is a polyamidoamine curing agent.
Aradur 125 is a BzOH-free grade.

As a formulated hardener, Aradur 125 consists of carefully selected reactive ingredients that provide controlled curing behavior, reliable processing characteristics, and consistent final product performance.
The cured epoxy systems exhibit excellent durability, low shrinkage, dimensional stability, and long service life, making them suitable for demanding engineering applications across numerous industrial sectors.

Aradur 125 is REACH registered.
Aradur 125 is not a single chemical substance.
Aradur 125 is a commercial epoxy curing agent (hardener).

Aradur 125 is a proprietary formulated mixture, not a pure chemical compound.
Therefore, Aradur 125 does not have a unique CAS Number, EC Number, molecular formula, or molecular weight assigned to the product itself.
Aradur 125 also supports the development of epoxy formulations with improved resistance to creep and long-term deformation under sustained mechanical loads.

The highly crosslinked polymer network helps maintain dimensional accuracy and structural performance even after prolonged service in demanding industrial environments.
Another notable characteristic is Aradur 125's ability to produce cured epoxy materials with excellent edge retention and surface quality.
Components manufactured using Aradur 125 often exhibit smooth, uniform surfaces that require minimal post-processing, making the product particularly suitable for tooling, mold production, and precision engineering applications.

In addition to mechanical performance, Aradur 125 contributes to the long-term stability of epoxy systems exposed to cyclic loading, vibration, and repeated thermal expansion and contraction.
These characteristics make the cured materials appropriate for applications involving continuous operational stress, such as electrical equipment, transportation structures, and industrial machinery.

Aradur 125 is also valued for its processing consistency during large-scale industrial production.
Aradur 125's stable viscosity and predictable curing behavior facilitate automated dispensing, metering, mixing, and casting operations, improving manufacturing efficiency while reducing process variability.

Furthermore, epoxy systems cured with Aradur 125 generally exhibit excellent compatibility with mineral fillers such as silica, alumina, calcium carbonate, and quartz flour.
The incorporation of these fillers enables manufacturers to enhance hardness, wear resistance, thermal conductivity, or dimensional stability depending on the intended end-use application.

USES and APPLICATIONS of ARADUR 125:
Aradur 125's main areas of application are in the ship – building, anti corrosion protection & the construction industry.
Aradur 125 acts as a curing agent.
Aradur 125 possesses high viscosity.

When mixed with compatible epoxy resins, Aradur 125 forms highly crosslinked thermoset polymers capable of delivering outstanding mechanical performance, environmental durability, and chemical resistance.
Aradur 125 is extensively used in structural adhesive formulations for bonding metals, glass, ceramics, wood, concrete, stone, and fiber-reinforced composites.

These adhesive systems are utilized in transportation equipment, industrial machinery, civil engineering, marine construction, and aerospace structures where high bond strength and long-term reliability are essential.
In composite manufacturing, Aradur 125 is incorporated into laminating resins used with glass fiber, carbon fiber, aramid fiber, and hybrid reinforcement materials.

The cured composite structures provide excellent strength-to-weight ratios and are suitable for automotive components, marine parts, sporting goods, wind energy structures, and industrial equipment.
Aradur 125 is also used in epoxy casting systems for molds, tooling boards, precision fixtures, prototype components, electrical insulators, and engineering parts requiring excellent dimensional accuracy and minimal curing shrinkage.

Aradur 125's controlled curing behavior enables manufacturers to produce defect-free castings with high mechanical integrity.
Within the electrical and electronics industries, Aradur 125 is applied in encapsulation, potting, impregnation, and insulation systems for transformers, switchgear, coils, sensors, capacitors, circuit boards, connectors, and electronic assemblies.

The cured materials provide reliable dielectric insulation while protecting components from moisture, dust, chemicals, and mechanical vibration.
Aradur 125 is additionally utilized in industrial flooring systems, heavy-duty protective coatings, corrosion-resistant linings, repair mortars, crack injection systems, and maintenance compounds.
These epoxy materials offer long service life under severe mechanical and chemical exposure, making them suitable for manufacturing facilities, warehouses, chemical plants, and infrastructure projects.

In combination with liquid or (preferably) solid epoxy resins or their solutions, such as Araldite GZ 7071 X 75, Aradur 125 is suitable for the formulation of cold-curing, solventcontaining coatings, for application to steel and mineral substrates.
Aradur 125's main areas of application are in ship-building, anti-corrosion protection and the construction industry.
In combination with liquid or (preferably) solid epoxy resins or their solutions, such as Araldite GZ 7071 X 75.

Aradur 125 is suitable for automotive, industrial maintenance and marine coatings.
When used along with liquid epoxy resins such as Araldite GY 250, GY 720, GY 783, Aradur 125 is possible to formulate mastics and reaction adhesives with large proportions of solids.
Aradur 125 is used with liquid epoxy resin, highly-filled mastic and reaction adhesives can be formulated.

Aradur 125 is a proprietary epoxy curing agent designed for use with liquid epoxy resin systems to manufacture high-performance thermosetting materials.
Aradur 125 is formulated to provide efficient curing under ambient or moderately elevated temperatures while producing epoxy networks with excellent mechanical strength, adhesion, chemical resistance, and electrical insulation properties.
Aradur 125 has been widely used in industrial adhesives, protective coatings, electrical encapsulation, composite manufacturing, tooling, laminating, and casting applications.

Aradur 125 is engineered to provide a carefully balanced curing profile that allows sufficient working time while achieving efficient crosslinking with compatible epoxy resins.
This balance makes Aradur 125 suitable for manufacturing processes that require precise mixing, resin impregnation, and controlled polymerization without excessively rapid gelation.
Aradur 125 is frequently selected for epoxy systems that require excellent wetting of reinforcement materials such as glass fibers, carbon fibers, and mineral fillers.

Good wetting behavior improves resin penetration, reduces void formation, and contributes to the production of composite parts with enhanced mechanical integrity and consistent quality.
Because of Aradur 125's compatibility with a variety of liquid epoxy resins, formulators can adjust the resin-to-hardener ratio and incorporate fillers, pigments, flame retardants, flexibilizers, or other functional additives to tailor the final properties for specific applications.

This flexibility allows manufacturers to design epoxy systems optimized for casting, bonding, coating, or composite fabrication.
Aradur 125 is commonly used in customized epoxy formulations developed for specialized engineering requirements, including high-performance repair systems, heavy-duty industrial grouts, corrosion-resistant composite structures, and protective encapsulation materials where reliability, durability, and long service life are essential.

BENEFITS of ARADUR 125:
Aradur 125 produces epoxy systems with excellent tensile, compressive, flexural, and impact strength, allowing cured materials to withstand demanding mechanical loads throughout extended service life.
Aradur 125's ability to generate highly crosslinked polymer networks contributes to outstanding durability and structural stability.

Aradur 125 provides excellent adhesion to numerous engineering materials, enabling the manufacture of high-performance bonded assemblies with reliable long-term performance.
Strong substrate adhesion minimizes the risk of delamination and improves the overall durability of adhesive and composite systems.

Cured epoxy materials prepared with Aradur 125 demonstrate excellent resistance to moisture, oils, fuels, dilute acids, alkalis, cleaning agents, and many industrial chemicals.
Aradur 125 durability allows the materials to perform effectively in aggressive industrial and outdoor environments.

Aradur 125 contributes to low curing shrinkage, minimizing internal stresses and dimensional distortion while improving casting accuracy and maintaining tight manufacturing tolerances.
This characteristic is especially beneficial for precision tooling and electrical encapsulation applications.

Aradur 125 enhances electrical insulation performance by producing epoxy systems with high dielectric strength, low electrical conductivity, and excellent resistance to electrical tracking.

These properties make the cured materials highly suitable for electrical insulation and electronic protection applications.
Aradur 125's balanced curing characteristics offer manufacturers good processing flexibility, allowing efficient mixing, impregnation, casting, laminating, and coating while maintaining consistent product quality across different production conditions.

COMPONENTS of ARADUR 125:
Aradur 125 is a proprietary polyamidoamine epoxy curing agent (hardener).
Aradur 125 is not a single chemical substance, but a formulated polymeric product.
According to the manufacturer's technical documentation, Aradur 125 is a polyamidoamine produced by the condensation of dimer fatty acids with selected polyamines.
Aradur 125 is supplied as a 100% active (solvent-free) curing agent.
The formulation of Aradur 125 consists primarily of the following component:
Polyamidoamine (active epoxy curing agent) – approximately 100 wt.%

PURPOSE of ARADUR 125:
Aradur 125 reacts with epoxy resins to form a highly crosslinked thermoset polymer, providing excellent adhesion, flexibility, toughness, corrosion resistance, and chemical resistance.

CHEMICAL ORIGIN of ARADUR 125:
The active polyamidoamine resin is manufactured by the polycondensation of:
Dimer fatty acids (dimerized unsaturated fatty acids)
Selected polyamines
This reaction produces a polymeric polyamide containing terminal amine groups that act as the reactive curing sites for epoxy resins.

CHARACTERISTICS of ARADUR 125:
Aradur 125 is a proprietary epoxy curing agent specifically engineered to provide controlled reactivity, reliable processing, and high-performance cured epoxy systems.
Rather than consisting of a single chemical compound, Aradur 125 is a formulated blend of reactive components optimized to achieve excellent curing efficiency and superior final material properties.
Aradur 125 reacts chemically with epoxy resins through an addition reaction involving amine functional groups and epoxy rings, producing a densely crosslinked thermosetting polymer network without generating volatile curing by-products.

This curing mechanism contributes to high mechanical strength, low shrinkage, excellent dimensional stability, and long-term structural integrity.
The cured epoxy systems exhibit excellent resistance to thermal cycling, moisture, environmental aging, and many industrial chemicals while maintaining good toughness and resistance to impact and fatigue loading.

These characteristics allow their use in structural applications subjected to demanding operating conditions.
Aradur 125 is compatible with a broad range of liquid epoxy resins and supports the production of adhesives, coatings, castings, laminates, electrical insulation systems, and composite structures.
Aradur 125's versatility enables manufacturers to tailor epoxy formulations for specialized engineering applications requiring reliable processing and consistent performance.

Aradur 125 is a high-performance epoxy curing agent specifically developed for use in two-component epoxy resin systems requiring reliable processing and durable end-use performance.
As a proprietary amine-based hardener, Aradur 125 is formulated to react efficiently with compatible epoxy resins, producing highly crosslinked thermoset polymers with excellent mechanical strength, chemical resistance, thermal stability, and electrical insulation properties.
Aradur 125 has been widely adopted in industrial manufacturing because it provides a balanced combination of curing speed, processing flexibility, and long-term durability.

The formulation is designed to support a broad range of epoxy applications of Aradur 125, including structural adhesives, protective coatings, composite laminates, electrical encapsulation, tooling systems, casting compounds, and civil engineering materials.
Aradur 125's carefully engineered composition allows manufacturers to achieve consistent curing behavior while maintaining excellent adhesion to metals, concrete, wood, ceramics, glass, and fiber-reinforced composites.

The resulting cured materials exhibit low shrinkage, high dimensional stability, and resistance to moisture, chemicals, and mechanical stress.
Aradur 125 is recognized for its versatility in both ambient- and elevated-temperature curing processes, enabling its use in manual, semi-automated, and industrial production environments.

Aradur 125 is compatible with numerous liquid epoxy resin systems and contributes to the production of materials capable of performing under demanding mechanical, electrical, and environmental conditions.
Owing to its reliable curing characteristics and excellent overall performance, Aradur 125 has become a widely used hardener in industries such as construction, transportation, marine engineering, aerospace, electronics, electrical insulation, and advanced composite manufacturing.

FEATURES of ARADUR 125:
Aradur 125 is a high viscosity clear liquid, viscosity: 40000-50000 mPa s at 25 degree C / Density: 0.96 g/cm3 / Flash point: 200°C.

PROPERTIES of ARADUR 125:
Aradur 125 has a high degree of anti-corrosion protection having good adhesion flexibility and long lasting working times.
In combination with solid epoxy resins or their solutions for cold-curing, solvent-containing coatings, presenting the following features:
• long working times
• non-tacky films after pre-reaction
• very good adhesion and flexibility
• very high degree of anti-corrosion protection
Reactivity increases throughout the Aradur 100, 115, 125, 140 hardeners.
The degree of sensitivity to high atmospheric humidity increases in proportion with the amine content.
For applications under cold-damp conditions, we recommend Aradur 422 XW 70, 423 XW 60, 424 XW 50 hardeners (pre-adducted polyamidoamine).

PHYSICAL and CHEMICAL PROPERTIES of ARADUR 125:
Product family: Crosslinking / Curing / Vulcanizing Agents
Chemical family: Amidoamines|Amines
Product Type: Additives
Appearance: Clear to pale yellow liquid
Physical State: Liquid
Odor: Mild amine-like odor
Color: Colorless to light amber
Chemical Nature: Proprietary amine-based curing agent formulation
Density (25°C): Approximately 0.95–1.10 g/cm³

Viscosity (25°C): Low to medium viscosity
Solubility in Water: Slight to moderate
Solubility in Organic Solvents: Soluble in alcohols and many polar organic solvents
Compatibility with Epoxy Resins: Excellent
Cure Mechanism: Addition reaction with epoxy groups
Cure Temperature: Ambient to elevated temperatures
Pot Life: Depends on resin system and mixing ratio
Gel Time: Formulation dependent
Flash Point: Generally above 100°C
Vapor Pressure: Low at room temperature
Volatility: Low
Boiling Point: Not applicable for proprietary mixture

Melting Point: Not applicable
pH (aqueous dispersion): Alkaline
Thermal Stability: Good after complete cure
Chemical Stability: Stable under recommended storage conditions
Moisture Sensitivity: Moderate; protect from humidity
Crosslink Density: High after complete curing
Shrinkage During Cure: Low
Mechanical Strength After Cure: Excellent
Dimensional Stability: Excellent
Adhesion to Substrates: Excellent
Electrical Insulation: Excellent
Chemical Resistance: Excellent after cure

Corrosion Resistance: High when incorporated into protective coatings
Oxidizing Properties: None
Explosive Properties: None
Hazardous Polymerization: Does not occur under recommended conditions
Shelf Stability: Good in sealed original containers
Function: Active epoxy curing agent (hardener)
Approximate content: ≈100 wt.%
CAS Number: Proprietary mixture (no single CAS number assigned)
EC Number: Mixture (no single EC number assigned)
Molecular Formula: Not applicable (polymeric proprietary mixture)
Molecular Weight: Not applicable (polymeric mixture)
Typical Formulation (Approximate)
Polyamidoamine: ~100%

Components
Benzyl Alcohol
CAS No.: 100-51-6
EC No.: 202-859-9
Molecular Formula: C₇H₈O

m-Xylylenediamine (MXDA)
CAS No.: 1477-55-0
EC No.: 216-032-5
Molecular Formula: C₈H₁₂N₂

Phenol, 4-nonyl-, branched (may be present in some formulations)
CAS No.: 84852-15-3
EC No.: 284-325-5
Molecular Formula: Variable (UVCB substance)

Salicylic Acid (curing accelerator; present in some grades only)
CAS No.: 69-72-7
EC No.: 200-712-3
Molecular Formula: C₇H₆O₃

Modified Aliphatic/Aromatic Amines (proprietary)
CAS No.: Not disclosed
EC No.: Not disclosed
Molecular Formula: Not disclosed

Product Name: ARADUR® 125
Product Type: Epoxy curing agent / Epoxy hardener
Chemical Nature: Proprietary formulated mixture
CAS Number: Not assigned (mixture)
EC Number: Not assigned (mixture)
Molecular Formula: Not applicable (mixture)
Molecular Weight: Not applicable (mixture)

FIRST AID MEASURES of ARADUR 125:
-Description of first-aid measures
*General advice:
Show this material safety data sheet to the doctor in attendance.
*If inhaled:
After inhalation:
Fresh air.
*In case of skin contact:
Take off immediately all contaminated clothing.
Rinse skin with
water/ shower.
*In case of eye contact:
After eye contact:
Rinse out with plenty of water.
Call in ophthalmologist.
Remove contact lenses.
*If swallowed:
After swallowing:
Immediately make victim drink water (two glasses at most).
Consult a physician.
-Indication of any immediate medical attention and special treatment needed.
No data available

ACCIDENTAL RELEASE MEASURES of ARADUR 125:
-Environmental precautions:
Do not let product enter drains.
-Methods and materials for containment and cleaning up:
Cover drains.
Collect, bind, and pump off spills.
Observe possible material restrictions.
Take up dry.
Dispose of properly.
Clean up affected area.

FIRE FIGHTING MEASURES of ARADUR 125:
-Extinguishing media:
*Suitable extinguishing media:
Carbon dioxide (CO2)
Foam
Dry powder
*Unsuitable extinguishing media:
For this substance/mixture no limitations of extinguishing agents are given.
-Further information:
Prevent fire extinguishing water from contaminating surface water or the ground water system.

EXPOSURE CONTROLS/PERSONAL PROTECTION of ARADUR 125:
-Control parameters:
--Ingredients with workplace control parameters:
-Exposure controls:
--Personal protective equipment:
*Eye/face protection:
Use equipment for eye protection.
Safety glasses
*Body Protection:
protective clothing
*Respiratory protection:
Recommended Filter type: Filter A
-Control of environmental exposure:
Do not let product enter drains.

HANDLING and STORAGE of ARADUR 125:
-Conditions for safe storage, including any incompatibilities:
*Storage conditions:
Tightly closed.
Dry.

STABILITY and REACTIVITY of ARADUR 125:
-Chemical stability:
The product is chemically stable under standard ambient conditions (room temperature).
-Possibility of hazardous reactions:
No data available