L-603 PREPREG  is a polyimide prepreg suitable for high temperature applications in the aerospace industry. L-603 can be used for engine compartment components requiring long-term exposure to high temperatures. This prepreg system is suitable for engine firewall applications where the designer is seeking burn-through resistance.
L-603 prepreg utilizes L-603 modified polyimide resin combined with glass reinforcement. L-603 is primarily supplied as impregnated 7781 style fiberglass fabric and is pigmented black.

Features and Benefits
• Relatively inexpensive polyimide prepreg
• Used to build a heat-resistant structure that will perform over long time periods
• Able to be processed via autoclave, platen press, or vacuum oven at relatively low pressures
• Self-Extinguishing per FAR part 25.853
• L-603 prepreg creates a char layer when exposed to flame which keeps the flame from penetrating substructures
• Applications include: Firewalls, Heat Shields, Insulation Blankets, and Thermal Padding


  • Global Business Unit
    Composite Materials


Segments Applications
Airframe Secondary structural materials

Chemical categories

Chemical category Chemical family Chemical product
Composites Thermoset Polyimide

Region of commercial availability

  • Asia / Pacific
  • Europe / Middle East / Africa
  • North America
  • Latin America

Download documentation for L-603