180 C curing epoxy matrix Provisional Product Data Description ® HexPly M81 is a high performance tough epoxy matrix for use in industrial applications requiring good impact ® resistance and damage tolerance, such as the automotive industry. HexPly M81 is based on the highly ® successful HexPly 8552 toughened epoxy resin system, used widely around the world for the manufacture of aircraft structures. Non-aerospace customers now have the opportunity to benefit from the excellent performance of this resin system presented with reinforcements specially adapted for industrial markets. Benefits and Features ■ Toughened epoxy matrix with excellent mechanical properties ■ Elevated temperature performance (Tg up to 200°C) ■ Versatile cure cycle (from 135°C to 180°C) ■ Available on various reinforcements ■ Excellent drape and tack Resin Matrix Properties ■ Maximum Glass Transition Temperature, TG onset dry

Product Data HexPly M81 is a flexible curing system and can be cured at temperatures from 135°C to 180°C. The recommended cure is 3 hours at 135°C. Alternative cure cycles can be used: Cure Temperature Time TG* (onset/DMA) Post cure TG* after PC * TG Temperature can be slightly different depending of the fabric weight. The lowest values are here above presented. Curing Cycle for monolithic parts Typical cure cycle for monolithic parts 1. 2. 3. 4. 5. 6. Apply the full vacuum (1 bar) Apply 7 bars gauge autoclave pressure Heat at 1-3 ° C/min to 135° C Hold at 135° C for 180 minutes Cool at 2-5°...

Product Data Prepreg Physical Properties (Examples only. For the wider prepreg range contact Hexcel) Product Designation Fibre Weave Mass Nominal Cured Ply Thickness Nominal Fibre Volume Nominal Laminate Density Cured Prepreg Mechanical Properties (Examples only. For the wider prepreg range contact Hexcel) Mechanical Properties are based on 135°C cure for 120 minutes, at 6 bar pressure and -0.95 bar vacuum + post curing 60 minutes at 170°C. Data is the result from several tests on autoclave cured laminates. Some of the values achieved will have been higher, and some lower than the figure quoted....

Product Data Prepreg Storage Life Shelf Life¹: 12 months at -18°C/0°F (from date of manufacture). ¹ Shelf Life: The maximum storage life for HexPly® prepreg, when stored continuously, in a sealed moisture-proof bag, at -18°C/0°F or 5°C/41°F. To accurately establish the exact expiry date, consult the box label. 2 Out Life : 14 days at room temperature (25°C max). 2 The maximum accumulated time allowed at room temperature between removal from the freezer and cure. Tack Life³: 10 days (depending of the reinforcements) at room temperature (25°C max). ³ Tack Life: The time, at room temperature, during...