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Product description

C640 is a flexible cure cyanate ester component prepreg, suitable for curing between 70-135°C (158-275°F). C640 is capable of withstanding very high temperatures and is inherently flame retardant. After a suitable post-cure the glass transition temperature can be increased to as high as 335°C (635°F).

The medium viscosity C640 resin is pre-impregnated into high performance fibers such as carbon, glass and aramid.

Product benefits/features

  • Variable cure temperatures 70-135°C (158-275°F)
  • Post curable for high Tg
  • High temperature resistance for applications such as brake ducts

Market segments

  • Motorsport & Formula 1
  • Automotive
  • Industrial


Product category Thermoset Prepreg
Processing Out of Autoclave / Vacuum bag
Post curable
Resin type Cyanate Ester
Tg (Dry, onset) 335 °C / 635 °F
Cure temperature (Optimal) 80 °C / 176 °F
Cure temperature (Lowest)70 °C / 158 °F
Cure temperature (Highest)135 °C / 275 °F
Out life 4 days
Post curable

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