Description
Film Weight / Color 3M™ Scotch-Weld™ Low Density Composite Surfacing Film AF 325M White 0.03 lbs./ft2 (147 g/m2) 3M™ Scotch-Weld™ Low Density Composite Surfacing Film AF 325LS White 0.056 lbs./ft2 (273 g/m2) 3M™ Scotch-Weld™ Low Density Composite Surfacing Film AF 325M Blue 0.035 lbs./ft2 (171 g/m2) 3M™ Scotch-Weld™ Low Density Composite Surfacing Film AF 325LS Blue 0.064 lbs./ft2 (313 g/m2) Reinforcing Carrier Scotch-Weld AF 325M Films are matte, non-woven scrim supported composite surfacing films. The LS versions have an integral expanded copper foil mesh. The density of the copper mesh is 0.029 lbs./ft2 (142 g/m2) Protective Liners Polyethylene (poly) on one side, paper on the other. Typical Film Thickness 0.006 - 0.008" (0.15 - 0.20 mm) Shop Handling Characteristics Drapeable and conformable at room temperature. Tack Adheres to cold or release coated tools. Out Time Approximately 30 days at 75°F (24°C) Gel Time 5 minutes at 250°F (121°C) (ASTM D3532) % Flow LS Versions: 10% (minimum) per ASTM D 3531 M Versions: 50% (minimum) using a 250°F (121°C) cure cycle for 50 minutes and 5°F (2°C)/minute rise rate (ASTM D 3531) Volatile Loss LS Versions: 1.5% (maximum) per ASTM D 3530 M Versions: Less than 1.5% using a 250°F (121°C) cure cycle for 60 minutes (ASTM D 3530) Glass Transition Temperature (Tg) of 306°F (152°C) by RDA Cured Product

Features
■ Excellent for surfacing composite parts.
■ Available in both white and blue to provide color contrast to underlying composite prepreg.
■ Co-cure compatible with most epoxy composite pre-preg systems at both 250°F (121°C) and 350°F (177°C).
■ Provides a smooth surface with minimal pinholes and other surface imperfections.
■ Reduces the need for subsequent surface filling, fairing and sanding operations.
■ Low density formulation aids in pre-paint surface preparation.
■ Operational performance range from -67°F (-55°C) to 300°F (149°C).
■ Resistant to effects of humidity exposure before and after cure.
■ Available with copper mesh for applications requiring both surfacing and lightning strike performance. Technical Datasheet January 2011 Product