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Ampreg 21FR FIRE RETARDANT EPOXY WET LAMINATING SYSTEM ¬ FST performance evaluated against UL 94 and BS476 ¬ Range of working times ¬ Capable of ambient only cures ¬ Ideal for wet laminating large composite structures INTRODUCTION Ampreg 21FR has been optimised for the manufacture of large composite structures using hand layup, and vacuum bagging techniques. Ampreg 21FR has been designed to give excellent mechanical and thermal properties from both ambient temperature cures, and moderate temperature postcures (50°C). This system is available with a range of hardener speeds, from Fast to Ultra Slow.

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INSTRUCTIONS FOR USE WORKSHOP CONDITIONS Ampreg 21FR is optimised for use between 18 - 25°C. At lower temperatures the product thickens and may become unworkable. At higher temperatures working times will be significantly reduced. Maximum relative humidity for use is 70%. MIXING AND HANDLING Ampreg 21FR should be mixed at the following ratios: Resin BONDING TECHNIQUES & PEEL PLY It is recommended to use nylon peel ply for any secondary bonding applications. Peel Ply is typically used on laminate surfaces which need to be left to cure or partially cure before further laminating or bonding...

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with a cure of 5 hours at 70°C or 16 hours at 50°C. The latter temperature is easily achievable with low cost heating and insulation techniques. CURING SCHEDULE AMBIENT TEMPERATURE CURE The system has been developed to provide good mechanical properties after an ambient only cure. The minimum recommended cure temperature is 18°C. Excellent mechanical/thermal properties can be achieved after a slightly elevated temperature post-cure. An initial cure of 42 hours (with uxtra slow hardener) or 16 hours (with fast hardener) at 20°C is recommended before demoulding. When using the Extra Slow or...

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PROPERTIES (CONT’D) Working Properties Resin/ Slow Hardener Extra Slow Hardener* Ultra Slow Hardener* Gel Time - 150g Mix in water (hrs:mins) Earliest Time To Apply Vacuum (hrs:mins) Latest Time To Apply Vacuum (hrs:mins) Earliest Time To Turn Off Vacuum (hrs:mins) Demould Time (hrs:mins) Initial Mixed Viscosity (P) * It is recommended to postcure laminates for 16 hours at 40oc, when manufactured using Extra Slow or Ultra Slow Hardeners. Cured System Properties Post Cured 16hrs 50°C Resin / Std Hardener Resin / Slow Hardener Resin / Extra Slow Hardener Resin / Ultra Slow Hardener * Resin...

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HEALTH AND SAFETY The following points must be considered: 1. Skin contact must be avoided by wearing protective gloves. Gurit recommends the use of disposable nitrile gloves for most applications. The use of barrier creams is not recommended, but to preserve skin condition a moisturising cream should be used after washing. 2. Overalls or other protective clothing should be worn when mixing, laminating or sanding. Contaminated work clothes should be thoroughly cleaned before re-use. 3. Eye protection should be worn if there is a risk of resin, hardener, solvent or dust entering the eyes. If...

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TRANSPORT & STORAGE The resin and hardeners should be kept in securely closed containers during transport and storage. Any accidental spillage should be soaked up with sand, sawdust, cotton waste or any other absorbent material. The area should then be washed clean (see appropriate Safety Data Sheet). Adequate long term storage conditions will result in a shelf life of two years for both the resin and hardeners. Storage should be in a warm dry place out of direct sunlight and protected from frost. The temperature should be between 10°C and 25°C. Containers should be firmly closed....

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