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

Dow DER 321 Epoxy Resin

Dow DER 321 Epoxy Resin is a liquid bisphenol-A-based epoxy resin from Dow’s DER™ series, offering excellent adhesion, chemical resistance and electrical insulation. Widely used in coatings, composites and electrical encapsulation, it cures with amines or anhydrides to deliver high mechanical strength and thermal stability. Ideal for demanding industrial applications requiring reliability and consistent performance.
  • dow der 321 epoxy resin_327e114f
  • dow der 321 epoxy resin_327e114f

Features Of Dow DER 321 Epoxy Resin

  1. Standard liquid bisphenol-A epoxy resin with consistent molecular weight distribution.

  2. Excellent compatibility with common amine and anhydride curing agents.

  3. Good adhesion to metals, composites, and various substrates.

  4. High reactivity enabling efficient processing in casting, potting, and laminating applications.

  5. Proven thermal and chemical resistance after proper cure.

Typical Applications Of Dow DER 321 Epoxy Resin

  1. Electrical encapsulation and potting of transformers, capacitors, and sensors.

  2. Structural adhesives for aerospace and automotive bonding.

  3. Laminating resin for fiberglass-reinforced plastic (FRP) panels and printed circuit boards (PCBs).

  4. Casting compounds for industrial tooling and decorative art components.

Specifications Of Dow DER 321 Epoxy Resin

Chemical TypeBisphenol-A based diglycidyl ether epoxy resin
Product FormClear to pale yellow liquid
AppearanceHomogeneous, low-viscosity liquid at 25°C
Epoxy Equivalent Weight (EEW)185–192 g/eq
Viscosity at 25°C12,000–16,000 cP
Chloride Content≤ 1,000 ppm
Softening Point12–18°C
Primary ApplicationsEncapsulation, laminating, adhesive formulation, and composite matrix resins


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