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Product description

E721-FR is a 120°C (248°F) cure modified epoxy prepreg of medium viscosity. E721-FR offers excellent structural properties, flame retardancy and exceptional toughness allowing direct lamination to honeycomb without the use of a film adhesive.

E721-FR is designed for structural applications. If fire retardant properties are not required, refer to Toray E720.

Product benefits/features

  • Direct lamination to honeycomb without the use of resin film
  • Fire resistant under FAR 25.853 Appendix F material test criteria (ii)

Market segments

  • Sport & recreation
  • Motorsport & Formula 1
  • Automotive
  • Energy
  • Medical
  • Consumer electronics
  • Aircraft Interiors
  • Industrial


Product category Thermoset Prepreg
Processing Out of Autoclave / Vacuum bag
Press forming
Resin type Epoxy
Tg (Dry, onset) 120 °C / 248 °F
Cure temperature (Optimal) 120 °C / 248 °F
Cure temperature (Lowest)120 °C / 248 °F
Cure temperature (Highest)120 °C / 248 °F
Out life 60 days

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