L-603 is a polyimide resin coated on various fabrics or fibers to make a prepreg material suitable for high-temperature applications in the aerospace industry. This product can be used for engine compartment components requiring long-term exposure to high temperatures. The L-603 prepreg system is suitable for engine firewall applications where the designer is seeking burn-through resistance.

• A relatively inexpensive material, L-603 allows the designer to build a heat-resistance structure that will perform over long term time periods required of today’s modern aircraft.
• L-603 may be cured in autoclave, press, or oven with relatively low pressure.
• The L-603 resin system creates a char when exposed to flame which keeps flame from penetrating substructures.

• Standard Weight: 0.098 lbs/ft² (479 g/m²)
• Standard Resin Solids: 32% by weight
• Volatile Content: 6-11%
• Standard Tack: Medium to High Tack
• Cured Ply Thickness: 0.010” (0.254 mm)
• Other Weights, Resin Contents, and Fabrics are Available

• Up to 60” width in rolls up to 100 yards long (152 cm x 91 m)

• 6 months at 40°F (4°C) or below
• 4 days at room temperature (70°F or 21°C)

• Firewalls
• Heat Shields
• Insulation Blankets
• Thermal Padding