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Elastomer-Modified Epoxy Resins for Extra Strength and Flexibility

EPON™ elastomer-modified epoxy resins incorporate flexible elements into the polymer backbone, which toughens the thermoset system by distributing internal stress over a greater area. After full cure, a secondary “rubber toughened” phase occurs, delivering:

  • Improved peel strength
  • Improved shear strength
  • Better thermal shock resistance
  • Better fatigue resistance

Westlake Epoxy offers a wide variety of EPON elastomer-modified epoxy resins adducted with varying elastomer contents. Adduction improves the overall performance and shelf stability of formulated components, as compared with simple blends of resin and CTBN elastomers. Optimal rubber content in the final formulated system typically ranges from 1 to 50% by weight. These elastomer-modified epoxy resins are compatible with a variety of standard liquid epoxy resins. They are used in the formulation of toughened epoxy resin systems designed to avoid brittleness and cracking in high performance applications such as:

Elastomer-modified Epoxy Resins

ProductTypical PropertiesDescriptionApplication
Resin TypeViscocity at 25oC, PWPE, g./eq.CoatingsConstructionCompositesAll Others(1)
EPON Resin 58005CTBN- modified BPA epoxy3000 - 8000325 – 375Epoxy resin with 40%. elastomer content. Increases peel strength, thermal shock resistance, toughness and fatigue resistance.
EPON Resin 58006CTBN- modified BPA epoxy1500 – 3000330 – 360Epoxy resin with 40%. elastomer content and a lower acrylonitrile level than EPON 58005. Improves flexibility and fatigue resistance.
EPON Resin 58034CTBN -modified DGENPG40 - 80275 - 305Elastomer- modified HELOXY™ 68 with 50% elastomer content. Provides a low viscosity and high toughness
EPON Resin 58901CTBN- modified BPA epoxy1000 – 5000195 – 210Epoxy resin with 5%. elastomer content. Provides flexibility and early green strength.

(1) Other applications include adhesives, electrical castings, electrical laminates and fibers

For more information, see Starting Formulations, Technical Data Sheets, or speak with a representative.

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