CLEAPSS DT - Supporting practical work in science, technology and art

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A polyester resin, dissolved in styrene, is hardened by mixing with a catalyst. It sets in 10 to 30 minutes. All mixing vessels, etc, are disposable and are not cleaned with solvents. The resin is often used with glass-fibre reinforcement to give glass-reinforced plastic (GRP) which may be machined, cut or abraded. Small scale repair kits use similar materials but with the catalyst supplied as a paste.
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