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

Mitsui R139S Epoxy Resin

Mitsui R139S Epoxy Resin is a high-purity, low-viscosity liquid epoxy resin from Mitsui Chemicals’ R-series, designed for advanced composites and electronic encapsulation. It offers excellent adhesion, thermal stability, and low halogen content, meeting stringent RoHS and REACH requirements. Ideal for aerospace prepregs and LED packaging due to its consistent reactivity and low ionic impurities.
  • mitsui r139s epoxy resin_fd1b35dc
  • mitsui r139s epoxy resin_fd1b35dc

Features Of Mitsui R139S Epoxy Resin

  1. High-purity bisphenol-A based liquid epoxy resin with low ionic impurity content.

  2. Excellent compatibility with standard amine and anhydride curing agents for broad formulation flexibility.

  3. Low viscosity (12,000–15,000 mPa·s at 25°C) enabling easy handling, mixing, and impregnation.

  4. Superior electrical insulation properties and long-term thermal stability up to 130°C (UL Class B).

  5. Consistent epoxide equivalent weight (EEW) of 187–193 g/eq ensuring reliable reactivity and crosslink density.

Typical Applications Of Mitsui R139S Epoxy Resin

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

  2. Vacuum-pressure impregnation (VPI) resins for stator and rotor windings.

  3. Encapsulants and potting compounds for power electronics and transformers.

  4. Structural laminating resins in glass-fiber reinforced composites for industrial equipment housings.

  5. High-performance adhesives for metal-to-metal bonding in demanding electrical environments.

Specifications Of Mitsui R139S Epoxy Resin

Chemical TypeBisphenol-A diglycidyl ether (DGEBA)
Product FormClear, low-viscosity liquid
AppearanceColorless to pale yellow, transparent
Epoxide Equivalent Weight (EEW)187–193 g/eq
Viscosity (25°C)12,000–15,000 mPa·s
Chloride Content≤ 500 ppm
Softening PointNot applicable (liquid at room temperature)
Primary ApplicationsElectrical insulation, VPI, encapsulation, laminating


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