Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

Dow DER 331 Epoxy Resin

Dow DER 331 Epoxy Resin is a bisphenol-A-based liquid epoxy resin from Dow’s DER™ series, offering low viscosity, excellent adhesion, and broad compatibility with hardeners. Widely used in coatings, composites, and electrical encapsulation, it delivers consistent performance, thermal stability, and reliable cure characteristics for demanding industrial applications.
  • dow der 331 epoxy resin_95d131ad
  • dow der 331 epoxy resin_95d131ad

Features Of Dow DER 331 Epoxy Resin

  1. Low-viscosity liquid epoxy resin for enhanced processability and ease of handling.

  2. High purity with consistent epoxide equivalent weight (EEW) for reliable reactivity and cure performance.

  3. Excellent adhesion to metals, composites, and cured thermosets.

  4. Good chemical resistance to alkalis, solvents, and moisture after proper curing.

  5. Compatible with common amine and anhydride hardeners for flexible formulation design.

Typical Applications Of Dow DER 331 Epoxy Resin

  1. Aerospace composite matrix resins for primary and secondary structural parts.

  2. Electrical encapsulation and potting compounds for high-voltage insulation systems.

  3. High-performance adhesives for metal-to-metal and metal-to-composite bonding.

  4. Tooling resins for molds and mandrels used in carbon fiber layup processes.

  5. Structural repair formulations for infrastructure and transportation equipment.

Specifications Of Dow DER 331 Epoxy Resin

Chemical TypeDiglycidyl ether of bisphenol-A (DGEBA)
Product FormClear, low-viscosity liquid
AppearanceWater-white to pale yellow, transparent
Epoxide Equivalent Weight (EEW)185–192 g/eq
Viscosity at 25°C12–14 Pa·s (12,000–14,000 cP)
Chlorine Content≤ 800 ppm
Volatiles Content≤ 0.3 wt%
Primary ApplicationsComposites, adhesives, encapsulants, tooling resins


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