L-397 is a phenolic-based surfacing film designed to be co-cured or post-cured with phenolic prepregs to improve the surface finish of composite parts. L-397 is formulated to adapt to most phenolic systems and can be applied to the surface of fiberglass, carbon, or aramid fabrics, woven or unidirectional. L-397 is appropriate for finishing surfaces on honeycomb sandwich structures as well as on laminated or layered parts.

• The high strength and high toughness of L-397 allows the designer to use this material in high abuse areas such as aircraft interiors, cargo systems, marine structural bulkheads, etc.
• After cure, L-397 is paint-ready and sandable (if necessary for finish).
• L-397 is formulated to meet both OSU heat release and smoke density and the FAA’s 12” and 60” vertical flammability standards for aircraft interiors.
• The weight and tack of L-397 can be tailored to meet specific customer needs so that the most efficient process is used and the best possible parts are made.

• Standard Weight: 0.030 lbs/ft² (146 g/m²)
• Optional Weights: 0.020 lbs/ft², 0.045 lbs/ft², 0.060 lbs/ft² (other weights available)
• Standard Thickness: 0.004“ (0.102 mm)
• Volatile Content: Less than 20%
• Tack: Medium to High
• Appearance: Cream to Light-Pink Film

• L-397 is available pre-consolidated with a variety of scrims and metallic mesh materials.