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

Mitsui R-140 Epoxy Resin

Mitsui R-140 Epoxy Resin is a high-purity, low-viscosity bisphenol-A-based epoxy resin from Mitsui Chemicals’ R-series. Designed for advanced composites and electronic encapsulation, it offers excellent adhesion, thermal stability, and processability. Its consistent molecular weight distribution ensures reliable curing performance with amine or anhydride hardeners. Widely used in aerospace, automotive, and PCB laminates where precision and durability are critical.
  • mitsui r 140 epoxy resin_f4c86174
  • mitsui r 140 epoxy resin_f4c86174

Features Of Mitsui R-140 Epoxy Resin

  1. High-purity bisphenol-A based liquid epoxy resin with consistent molecular weight distribution.

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

  3. Low viscosity (12,000–14,000 cP at 25°C) enabling easy handling, mixing, and impregnation in composite processes.

  4. Superior electrical insulation properties and low dielectric loss, suitable for high-performance electronic encapsulation.

  5. Good thermal stability with glass transition temperature (Tg) of cured system typically exceeding 120°C.

Typical Applications Of Mitsui R-140 Epoxy Resin

  1. Electrical insulation and potting compounds for power electronics and transformers.

  2. Matrix resin for filament-wound and pultruded fiberglass composites in structural applications.

  3. Base resin for high-voltage insulators and bushings requiring arc resistance and tracking immunity.

  4. Encapsulants for LED modules and automotive sensors demanding long-term reliability under thermal cycling.

  5. Adhesives and laminating resins for printed circuit board (PCB) substrates and metal-to-composite bonding.

Specifications Of Mitsui R-140 Epoxy Resin

Chemical TypeBisphenol-A epoxy resin
Product FormClear to pale yellow viscous liquid
Epoxy Equivalent Weight (EEW)185–192 g/eq
Viscosity (25°C)12,000–14,000 cP
Chlorine Content≤ 700 ppm
Color (Hazen)≤ 30
Volatiles Content≤ 0.3 wt%
Storage StabilityStable for ≥12 months at 20–25°C in sealed containers


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