Product Introduction of 3M Scotch-Weld Structural Adhesive Film AF 191
3M Scotch-Weld Structural Adhesive Film AF 191 is a thermosetting modified epoxy adhesive in film form, engineered for long-term durability in metal and composite solid panel and honeycomb sandwich construction. Designed for a 350°F (175°C) cure, this adhesive can also be cured at temperatures as low as 275°F (135°C), offering process flexibility for aerospace applications. AF 191 delivers high fracture toughness, excellent peel strength, and superior elevated temperature performance, making it ideal for demanding structural bonding tasks.
This adhesive film is available in various weights and carriers to meet diverse manufacturing needs while maintaining cost efficiency. An unsupported version is offered for reticulation applications. AF 191 is compatible with multiple substrates and primers, including 3M™ Scotch-Weld™ Structural Adhesives Primer EW-5000, EW-5000 AS, and EC-3917. The film exhibits excellent pre-bond humidity performance on composite substrates and provides high bond strength across a wide temperature range from -67°F to 350°F (-55°C to 175°C). It is also available with a lightweight conductive screen for lightning strike protection and composite surfacing, further enhancing its versatility in aerospace manufacturing.
Key Features
- Designed for 350°F cure (175°C)
- Adhesive can be cured from 275°F (135°C) up to 350°F (175°C)
- Excellent elevated temperature performance
- Unsupported version available for reticulation
- High-fracture toughness and peel strength
- Available with lightweight conductive screen for lightning strike protection and composite surfacing
- Compatible with multiple 3M™ Scotch-Weld™ Structural Adhesives Primers
- Excellent pre-bond humidity performance on composite substrates
- Provides high bond strength from -67°F to 350°F (-55°C to 175°C)
Key Applications
- Bonding metal, composite, and honeycomb structures in aerospace manufacturing
- Monolithic bonding and honeycomb sandwich construction
- Applications requiring high fracture toughness and elevated temperature performance
- Reticulation applications using unsupported versions
- Structural bonding tasks requiring lightning strike protection with conductive screen versions
- Adhesive bonding processes requiring compatibility with multiple primers and substrates
- Production environments requiring high bond strength and minimal surface preparation
About Prostech
Prostech offers specialty materials (adhesives, tapes, thermal interface materials, insulating materials, sealants, PCB protection materials, …) along with manufacturing solutions. We proudly serve a wide range of industries and are an authorized distributor for leading global manufacturers of industrial materials and equipment. Our product range is designed to deliver customized solutions that address each customer’s unique needs.
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| Property | Value |
|---|---|
| Adhesive Type | Epoxy |
| Application | Bonding |
| Cure Rate | 1 hr |
| Curing Temperature (Celsius) | 177 ℃ |
| Curing Temperature (Fahrenheit) | 350 ℉ |
| Maximum Cure Conditions (Celsius) | 200 ℃ |
| Maximum Cure Conditions (Fahrenheit) | 400 ℉ |
| Maximum Operating Temperature (Celsius) | 175 ℃ |
| Maximum Operating Temperature (Fahrenheit) | 350 ℉ |
| Minimum Cure Conditions (Celsius) | 135 ℃ |
| Minimum Cure Conditions (Fahrenheit) | 275 ℉ |
| Minimum Operating Temperature (Celsius) | -55 ℃ |
| Minimum Operating Temperature (Fahrenheit) | -67 ℉ |
| Nominal Adhesive Thickness (Imperial) | 2.5 mil, 6 mil, 8 mil, 10 mil, 13 mil, 16 mil |
| Nominal Adhesive Thickness (Metric) | 0.064 mm, 0.152 mm, 0.203 mm, 0.254 mm, 0.33 mm, 0.406 mm |
| Nominal Weight (Imperial) | 0.015 lb/ft², 0.03 lb/ft², 0.035 lb/ft², 0.055 lb/ft², 0.06 lb/ft², 0.08 lb/ft², 0.1 lb/ft² |
| Product Color | Tan |
| Product Form | Roll |
| Storage Environment | Freezer Storage |
| Substrate | Metal, Composite |
| Overall Length (Imperial) | 18 yd, 25 yd, 36 yd, 40 yd, 50 yd |
| Overall Length (Metric) | 16 m, 22.9 m, 33 m, 36.576 m, 45.7 m |
| Overall Width (Imperial) | 14 in, 18 in, 36 in, 42 in, 48 in |
| Overall Width (Metric) | 0.9 m, 1.1 m, 1.2 mm, 356 m, 457 mm |
