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

Dow DEN 438 Phenolic Epoxy Resin

Dow DEN 438 Phenolic Epoxy Resin is a high-performance brominated epoxy resin from Dow’s DEN series, offering exceptional flame retardancy, thermal stability and chemical resistance. Widely used in PCB laminates, aerospace composites and demanding electronic encapsulations, it delivers superior dielectric properties and low moisture absorption versus standard epoxies.
  • dow den 438 phenolic epoxy resin_94433acb
  • dow den 438 phenolic epoxy resin_94433acb

Features Of Dow DEN 438 Phenolic Epoxy Resin

  1. Highly crosslinkable phenolic epoxy structure delivering exceptional thermal stability and chemical resistance.

  2. Low viscosity in molten state enabling excellent processability for filament winding, pultrusion, and compression molding.

  3. Superior adhesion to carbon fiber, glass fiber, and metallic substrates without requiring additional primers.

  4. Excellent electrical insulation properties with low dielectric loss at elevated temperatures.

  5. Designed for high-performance composites requiring UL 94 V-0 rated flame retardancy when formulated with appropriate hardeners.

Typical Applications Of Dow DEN 438 Phenolic Epoxy Resin

  1. Aerospace structural components including radomes, engine nacelles, and interior panels.

  2. High-voltage electrical insulators and bushings for power transmission equipment.

  3. Friction materials and brake linings for commercial and industrial braking systems.

  4. High-temperature composite tooling matrices for autoclave and RTM manufacturing processes.

  5. Chemical-resistant tank linings and pipe coatings for aggressive industrial environments.

Specifications Of Dow DEN 438 Phenolic Epoxy Resin

Chemical TypePhenolic epoxy novolac resin
Product FormPale yellow to amber solid pellets
AppearanceFree-flowing granular solid at room temperature
Softening Point (ASTM E28)85–95 °C
Epoxy Equivalent Weight (EEW)170–190 g/eq
Hydroxyl Number (ASTM D4294)480–540 mg KOH/g
Volatiles Content (ASTM D229)< 0.5 wt%
Key FeaturesHigh functionality, thermally stable, low melt viscosity, halogen-free


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