Product Introduction of 3M Scotch-Weld Composite Surfacing Film AF 325 M
3M Scotch-Weld Composite Surfacing Film AF 325 M, Blue is a thermosetting epoxy surfacing film designed to deliver excellent results on composite parts. It creates a smooth, void-free surface with minimal pinholes, significantly reducing the need for surface filling, fairing, or sanding operations during pre-paint preparation. This low-density surfacing film simplifies the finishing process while improving overall surface quality.
Available in both white and blue versions, the film provides color contrast to the underlying composite prepreg, enhancing visual inspection and process control. It is co-cure compatible with most epoxy composite prepreg systems at both 250°F (121°C) and 350°F (177°C). With an operational performance range from -67°F (-55°C) to 300°F (149°C), AF 325 M, Blue is well-suited for demanding aerospace and composite applications.
For optimal results during application, the paper liner should be removed, leaving the poly liner in place to minimize contamination and improve conformability during handling and placement.
Key Features
- Excellent for surfacing composite parts to enhance finish quality
- Available in both white and blue to provide color contrast with underlying prepreg
- Co-cure compatible with most epoxy composite prepreg systems
- Delivers smooth surfaces with minimal pinholes and imperfections
- Reduces the need for surface filling, fairing, and sanding
- Low-density formulation aids in pre-paint surface preparation
- Wide operational performance range from -67°F (-55°C) to 300°F (149°C)
Key Applications
- Surfacing composite parts in aerospace and industrial applications
- Pre-paint preparation for composite assemblies
- Applications requiring co-cure with epoxy composite prepreg systems
- Reducing surface finishing steps such as sanding, fairing, or filling
- Visual inspection processes requiring color contrast with prepreg materials
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| Property | Value |
|---|---|
| Adhesive Type | Epoxy |
| Cure Rate | 1 hr |
| Maximum Cure Conditions (Celsius) | 177 ℃ |
| Maximum Cure Conditions (Fahrenheit) | 350 ℉ |
| Maximum Operating Temperature (Celsius) | 149 ℃ |
| Maximum Operating Temperature (Fahrenheit) | 300 ℉ |
| Minimum Cure Conditions (Celsius) | 121 ℃ |
| Minimum Cure Conditions (Fahrenheit) | 250 ℉ |
| Minimum Operating Temperature (Celsius) | -55 ℃ |
| Minimum Operating Temperature (Fahrenheit) | -67 ℉ |
| Nominal Weight (Imperial) | 0.035 lb/ft² |
| Product Color | Blue |
| Product Form | Roll |
| Storage Environment | Freezer Storage |
| Dimensions and Classifications | |
| Overall Length (Imperial) | 36 yd, 50 yd |
| Overall Length (Metric) | 33 m, 45.7 m |
| Overall Width (Imperial) | 36 in |
| Overall Width (Metric) | 0.9 m |
