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Low Density Composite Surfacing Film

Introduction

3M™ Scotch-Weld™ Low Density Composite Surfacing Film AF 325 and AF 325LS offer the

following advantages:

• 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

Description

Film Weight / Color

3M™ Scotch-Weld™ Low Density Composite Surfacing Film AF 325M White

3M™ Scotch-Weld™ Low Density Composite Surfacing Film AF 325LS White

3M™ Scotch-Weld™ Low Density Composite Surfacing Film AF 325M Blue

3M™ Scotch-Weld™ Low Density Composite Surfacing Film AF 325LS Blue

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.

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

Note: The following technical information and data should be considered representative or typical

only and should not be used for specification purposes.