High-performance bisphenol-A based liquid epoxy resin with excellent chemical resistance.
Low viscosity enables easy handling, precise metering, and superior wetting of reinforcements.
Consistent reactivity profile optimized for reliable processing in casting, laminating, and adhesive formulations.
Excellent electrical insulation properties and high dielectric strength.
Good compatibility with standard amine and anhydride curing agents for tailored cure kinetics.
Electrical encapsulation and potting compounds for transformers, sensors, and power electronics.
Structural adhesives for aerospace and automotive composite bonding.
Laminating resins for printed circuit board (PCB) substrates and prepregs.
Casting resins for high-voltage insulators and industrial tooling.
Matrix resin in fiber-reinforced composites for wind energy and transportation components.
| Chemical Type | Bisphenol-A epoxy resin |
| Product Form | Liquid |
| Appearance | Pale yellow to water-white, clear liquid |
| Epoxy Equivalent Weight (EEW) | 185–192 g/eq |
| Viscosity at 25°C | 12–16 Pa·s (12,000–16,000 cP) |
| Chloride Content | ≤ 500 ppm |
| Volatiles Content | ≤ 0.3 wt% |
| Key Features | Low viscosity, high purity, consistent reactivity, excellent electrical properties |
Q1: What is the primary function of ARALDITE BY 158 in epoxy formulations?
A: ARALDITE BY 158 is a reactive liquid diluent designed to reduce viscosity and improve processability of standard bisphenol-A based epoxy resins without significantly compromising final crosslink density or thermal performance.
Q2: Is ARALDITE BY 158 suitable for high-performance structural adhesives?
A: Yes — it is commonly incorporated into structural adhesive systems where lower mixing viscosity, extended pot life, and good wetting of substrates are required, while maintaining robust mechanical properties after cure.
Q3: How does ARALDITE BY 158 compare to non-reactive diluents?
A: Unlike non-reactive diluents, BY 158 participates in the epoxy curing reaction, helping to retain chemical resistance, glass transition temperature (Tg), and dimensional stability in the cured network.
Q4: Can ARALDITE BY 158 be used in coatings applications?
A: Yes — it is frequently employed in high-solids and solvent-free epoxy coatings to enhance flow, leveling, and substrate penetration, particularly in industrial maintenance and protective coating systems.
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