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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

EPI-REZ™ Resin 5108-W-60


EPI-REZ Resin 5108-W-60 is a nonionic, waterborne dispersion of a highly multifunctional Bisphenol A epoxy novolac resin and is most commonly used in combination with other epoxy resin dispersions to increase the epoxide functionality of a system.  Adding EPI-REZ Resin 5108-W-60 to fiber sizing formulations will lead to increased epoxide functionality in the fiber-matrix interphase and can improve moisture, chemical and thermal performance for fiber-reinforced composites.   In cured applications, EPI-REZ Resin 5108-W-60 can be used to increase the rate of green strength or hardness development and will also contribute to improved moisture, chemical and thermal resistance.


  • High functionality epoxy resin
  • Excellent particle size stability
  • No VOC
  • Superior hydrolytic and chemical resistance
  • High thermal resistance
  • Can be cured through epoxide functional groups

Sales Specification

Property Standard Value Unit Test Method
Epoxy Group Content EGC 4000 - 4760 mmol/kg ASTM D1652
Particle Size Coulter Volume Mean 1.7 max. µm Internal
Solids Content 58 - 60 %m ASTM D1259
Viscosity at 25°C, Brookfield 5000 - 13000 cP ASTM D1545
Weight per Epoxide WPE 210 - 250 g/eq ASTM D1652

Typical Properties

Property Standard Value Unit Test Method
Appearance Opaque white liquid
Organic Cosolvent None
pH 3 - 6 ASTM E70

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