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

NPPN-638S Phenolic Epoxy Resin

NPPN-638S Phenolic Epoxy Resin is a high-performance brominated novolac-type epoxy resin from NPPN’s 638 Series, offering superior flame retardancy, thermal stability, and chemical resistance—ideal for demanding PCB laminates, encapsulants, and aerospace composites requiring UL94 V-0 rating and high glass transition temperature.
  • nppn 638s phenolic epoxy resin_8ccf3ee3
  • nppn 638s phenolic epoxy resin_8ccf3ee3

Features Of NPPN-638S Phenolic Epoxy Resin

  1. High thermal stability with excellent resistance to continuous service temperatures up to 180 °C.

  2. Superior chemical resistance to strong acids, alkalis, and organic solvents in cured form.

  3. Enhanced adhesion to metal substrates including aluminum, copper, and stainless steel.

  4. Low viscosity at elevated processing temperatures, enabling easy impregnation and coating application.

  5. Halogen-free formulation compliant with RoHS and REACH regulatory requirements.

Typical Applications Of NPPN-638S Phenolic Epoxy Resin

  1. Electrical insulation systems for high-voltage motors and generators.

  2. Encapsulation and potting compounds for power electronics modules.

  3. Structural adhesives in aerospace composite bonding assemblies.

  4. High-performance coatings for corrosion protection of oil & gas infrastructure.

  5. Matrix resin for carbon fiber reinforced laminates used in demanding industrial tooling.

Specifications Of NPPN-638S Phenolic Epoxy Resin

Chemical TypePhenolic-modified epoxy resin (novolac-based)
Product FormOff-white to light amber solid pellets
AppearanceFree-flowing granular solid at room temperature
Softening Point85–92 °C (ASTM E28)
Epoxy Equivalent Weight (EEW)185–195 g/eq (ASTM D1652)
Volatiles Content≤ 0.5 wt% (120 °C, 2 h, ASTM D2247)
Storage StabilityStable for ≥12 months at 25 °C in sealed containers
Primary ApplicationsHigh-temp electrical insulation, structural composites, corrosion-resistant coatings


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