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ARALDITE PY 304 is an unmodified epoxy resin based on bisphenol-A/F with low-crystallization.
ARALDITE PY 304 is a liquid epoxy resin based on bisphenol-A chemistry, developed for industrial adhesive, coating, casting, and composite applications.
ARALDITE PY 304 forms a rigid, chemically resistant thermoset polymer network after crosslinking and is widely used where high mechanical strength, adhesion, and durability are required.
CAS Number: 25068-38-6
EC Number: 500-033-5
Molecular Formula: (C21H24O4)n
Synonyms: Diglycidyl ether of bisphenol A, Poly(bisphenol A-co-epichlorohydrin), BPA-based epoxy resin, Low-viscosity BPA epoxy resin, Difunctional epoxy resin, Industrial laminating epoxy resin, Casting grade epoxy resin, Bisphenol A diglycidyl ether, DGEBA resin, Bisphenol A epoxy resin, Liquid epoxy resin (BPA type), Epichlorohydrin–bisphenol A resin
ARALDITE PY 304 is a high-performance liquid epoxy resin formulated on a bisphenol-A diglycidyl ether backbone and designed for demanding industrial applications.
ARALDITE PY 304 is characterized by its controlled viscosity, consistent epoxy functionality, and reliable processing behavior in multi-component epoxy systems.
ARALDITE PY 304 contains reactive epoxide groups that readily undergo crosslinking reactions with amine, anhydride, or polyamide curing agents, enabling the formation of a dense and mechanically robust thermoset structure.
Upon curing, ARALDITE PY 304 develops excellent adhesion to a wide range of substrates including steel, aluminum, concrete, and composite materials.
The crosslinked polymer network formed by ARALDITE PY 304 provides high tensile and compressive strength, dimensional stability, and resistance to mechanical stress.
ARALDITE PY 304 also demonstrates good resistance to water, dilute acids, alkalis, and many industrial chemicals, making it suitable for protective coatings and flooring systems exposed to aggressive environments.
ARALDITE PY 304 is widely used in structural adhesives, corrosion-protective coatings, industrial flooring, casting compounds, electrical encapsulation systems, and fiber-reinforced composite applications.
ARALDITE PY 304 offers formulation versatility and can be processed under ambient or elevated curing conditions depending on performance requirements, ensuring consistent and durable results across multiple industrial sectors.
ARALDITE PY 304 is an unmodified epoxy resin based on bisphenol-A/F with low-crystallization.
ARALDITE PY 304 has a low viscosity.
ARALDITE PY 304 offers mechanical properties and chemical resistance.
ARALDITE PY 304 is a low-viscosity liquid epoxy resin based on bisphenol A chemistry, designed for casting, laminating, and electrical insulation applications requiring excellent flow and reliable curing performance.
ARALDITE PY 304's reduced viscosity enables efficient filler incorporation and improved fiber wetting, making it particularly suitable for composite and encapsulation systems.
When reacted with compatible amine or anhydride curing agents, ARALDITE PY 304 forms a rigid and durable thermoset network with good mechanical strength, strong adhesion, and reliable chemical resistance.
ARALDITE PY 304 is widely used in electrical potting and encapsulation, structural adhesives, fiber-reinforced composites, tooling systems, and protective coating formulations where consistent processing and dependable long-term performance are essential.
ARALDITE PY 304 is a liquid epoxy resin based on bisphenol-A chemistry, developed for industrial adhesive, coating, casting, and composite applications.
ARALDITE PY 304 contains reactive epoxide groups that enable efficient curing with amine, anhydride, or polyamide hardeners.
ARALDITE PY 304 forms a rigid, chemically resistant thermoset polymer network after crosslinking and is widely used where high mechanical strength, adhesion, and durability are required.
Uses of ARALDITE PY 304:
ARALDITE PY 304 is widely used in structural bonding, protective coatings, industrial flooring, casting systems, electrical encapsulation, and composite manufacturing.
ARALDITE PY 304 serves as a base resin in high-strength adhesive formulations for bonding metals, concrete, wood, and composite substrates.
ARALDITE PY 304 is applied in corrosion-resistant coatings for steel structures, tanks, and pipelines, as well as in heavy-duty epoxy flooring systems exposed to mechanical and chemical stress.
ARALDITE PY 304 is also utilized in casting and tooling compounds, potting and insulation systems for electrical components, and fiber-reinforced composite materials where mechanical strength, chemical resistance, and long-term durability are essential.
Advantages of ARALDITE PY 304:
High mechanical strength:
ARALDITE PY 304 provides excellent tensile, compressive, and flexural strength after curing.
Strong adhesion performance:
ARALDITE PY 304 ensures reliable bonding to metals, concrete, wood, and composite materials.
Chemical durability:
ARALDITE PY 304 offers good resistance to water, dilute acids, alkalis, fuels, and various industrial chemicals.
Corrosion protection:
ARALDITE PY 304 enhances long-term protection of steel and metal substrates against environmental exposure.
Dimensional stability:
ARALDITE PY 304 maintains structural integrity and shape stability under mechanical stress.
Versatile curing compatibility:
ARALDITE PY 304 can be formulated with amine, anhydride, or polyamide hardeners for tailored performance.
Processing flexibility:
ARALDITE PY 304 supports both ambient and elevated temperature curing systems.
Long service life:
ARALDITE PY 304 forms a durable thermoset network that provides extended performance in demanding industrial environments.
Processing of ARALDITE PY 304:
ARALDITE PY 304 is processed by accurately mixing the resin with a compatible curing agent in the recommended stoichiometric ratio to ensure complete crosslinking and optimal performance.
ARALDITE PY 304 should be thoroughly blended to achieve a homogeneous mixture and prevent incomplete curing or weak spots in the final material.
ARALDITE PY 304 can be applied at ambient temperature or cured under elevated temperatures depending on the selected hardener and required mechanical properties.
The viscosity of ARALDITE PY 304 may be adjusted with reactive diluents, fillers, or additives to meet specific application requirements.
After mixing, ARALDITE PY 304 has a defined pot life influenced by formulation and temperature conditions, and it can be applied by brushing, rolling, pouring, casting, or injection before full curing is completed.
Stability and Reactivity of ARALDITE PY 304:
Chemical stability:
ARALDITE PY 304 is stable under recommended storage conditions when kept in tightly closed containers.
Reactivity:
ARALDITE PY 304 reacts exothermically with amine curing agents.
Anhydride curing agents.
Polyamide curing agents to form a crosslinked thermoset network.
Conditions to avoid:
ARALDITE PY 304 should be kept away from excessive heat.
Open flames.
Uncontrolled mixing with curing agents.
Incompatible materials:
ARALDITE PY 304 is incompatible with strong acids.
Strong bases.
Strong oxidizing agents.
Hazardous decomposition products:
ARALDITE PY 304 may release carbon oxides (CO, CO₂).
Irritating organic vapors under fire or severe thermal decomposition.
Handling and Storage of ARALDITE PY 304:
Handling:
ARALDITE PY 304 should be handled with appropriate industrial hygiene practices.
Skin and eye contact should be avoided.
Adequate ventilation should be provided.
Storage:
ARALDITE PY 304 should be stored in original, tightly sealed containers in a cool, dry, and well-ventilated area.
Temperature control:
ARALDITE PY 304 should be protected from direct sunlight.
Excessive heat should be avoided to maintain product quality.
Contamination prevention:
ARALDITE PY 304 should be protected from moisture and contamination to avoid unwanted reactions.
First Aid Measures of ARALDITE PY 304:
Inhalation:
If vapors or mists of ARALDITE PY 304 are inhaled, the affected person should be moved to fresh air.
Medical attention should be sought if symptoms persist.
Skin contact:
Skin exposed to ARALDITE PY 304 should be washed immediately with soap and water.
Eye contact:
Eyes exposed to ARALDITE PY 304 should be rinsed cautiously with water for several minutes.
Medical advice should be obtained if irritation continues.
Ingestion:
If ARALDITE PY 304 is swallowed, the mouth should be rinsed.
Medical attention should be sought without inducing vomiting unless directed by medical personnel.
Firefighting Measures of ARALDITE PY 304:
Suitable extinguishing media:
Fires involving ARALDITE PY 304 can be extinguished using foam.
Dry chemical powder.
Carbon dioxide.
Water spray.
Protective equipment:
Firefighters should wear self-contained breathing apparatus.
Full protective gear.
Combustion hazards:
Burning ARALDITE PY 304 may produce dense smoke.
Carbon monoxide.
Carbon dioxide.
Other irritating fumes.
Accidental Release Measures of ARALDITE PY 304:
Personal precautions:
Personnel should wear appropriate protective equipment.
Direct contact with spilled ARALDITE PY 304 should be avoided.
Environmental precautions:
ARALDITE PY 304 should be prevented from entering drains, soil, or surface water.
Cleanup method:
Spilled ARALDITE PY 304 should be absorbed with inert materials such as sand, earth, or vermiculite.
ARALDITE PY 304 should be placed in suitable containers for disposal.
Exposure Controls / Personal Protection of ARALDITE PY 304:
Respiratory protection:
Respiratory protection should be used if ventilation is insufficient or exposure limits are exceeded.
Hand protection:
Chemical-resistant gloves should be worn when handling ARALDITE PY 304.
Eye protection:
Safety goggles or face shields should be used to prevent eye exposure.
Skin protection:
Protective clothing should be worn to minimize skin contact.
Hygiene measures:
Hands should be washed thoroughly after handling ARALDITE PY 304.
Hands should be washed before eating, drinking, or smoking.
Identifiers of ARALDITE PY 304:
CAS Number: 25068-38-6
EC Number: 500-033-5
Molecular Formula: (C21H24O4)n
Molecular Weight: Polymeric; variable depending on degree of polymerization
Chemical family: DGEBA epoxy resin
Epoxy functionality: Difunctional epoxide
Physical form: Viscous liquid
Properties of ARALDITE PY 304:
Viscosity: Medium viscosity liquid at room temperature
Density: Approx. 1.1–1.2 g/cm³
Physical State: Liquid
Color: Clear to light yellow
Odor: Mild characteristic epoxy odor
Viscosity: Low at 25 °C
Density: Approximately 1.14–1.18 g/cm³ at 25 °C
Epoxy Equivalent Weight (EEW): Typically around 182–192 g/eq
Solubility: Insoluble in water; soluble in many organic solvents
Flash Point: Typically above 150 °C
