Carbon Fiber Fabric Repair Prepreg, 125°C (250°F) Vacuum Curing Part 2 - Qualification Program for Fiber, Fabric, Resin and Film Adhesive
AMS3970/2
AMS 3970/2 gives specific information about the qualification program for carbon fiber reinforced epoxy structural repair prepreg systems, applicable for 120 °C (250 °F) vacuum curing. The prepreg system may include an epoxy film adhesive to be applied in a co-curing process with the prepreg for joint and sandwich bonding. The need for a film adhesive shall be established during screening tests.
Rationale: Main Updates are:
-Harmonization of requirements with AMS6885
- Storage life extension procedures
- Clarified shipping and storage conditions
- Additional cure cycles for M20 /40%/G904 to support thick repairs and higher in-service temperatures
- Re-qualifying the non-structural M20 glass prepreg due to changes in the manufacture process by Hexcel and due to introduction of a new resin content
