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On February 1, 2022, Hexion Holdings Corporation announced that it has completed the sale of its Coatings and Composite businesses, which includes the epoxy specialty resins and base epoxy resins and intermediates product lines, to Westlake Chemical Corporation. For epoxy coatings and composite product inquiries, please contact customer service at or

EPON™ Resin 825


EPON™ Resin 825 is a high purity bisphenol A epichlorohydrin epoxy resin. As a result, the viscosity of this product is lower than standard bisphenol A liquid resins without the use of diluents or modifiers.

Resin/curing agent systems based on EPON 825 have greater clarity, chemical resistance, higher heat distortion temperature, and lower electrical conductivity than can be obtained with most other standard resins.

Due to the high purity, the resin may form crystals. The crystals can be converted to liquid without damaging the resin by opening the drum bung and heating between 45 °C (113 °F) and 50 °C (122 °F). The tendency to crystallize can also be reduced by adding either 5% to 10% of para-tertiary-butyl phenol glycidyl ether or 20% to 30% of EPON Resin 862, a bisphenol F (BPF) epoxy resin.


  • Low viscosity
  • Low color
  • Reacts with a full range of curing agents
  • Produces high-strength cured systems resistant to chemical attack

Sales Specification

Property Standard Value Unit Test Method
Color 1 max. Gardner ASTM D1544
Viscosity at 25°C 50 - 65 P ASTM D445
Weight per Epoxide 175 - 180 g/eq ASTM D1652

Typical Properties

Property Standard Value Unit Test Method
Density at 25°C 9.7 - 9.8 lb/gal ASTM D1475
Saponifiable Chloride 0.03 max. % wt.
Sodium 2 max. ppm

1 Plant Method HC 692A-85 , Determination of Sodium in EPON Resins-MlBK Solutions (Extraction-lon Selective Electrode Method)

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