Imperial Chemical Industries Limited

Bruce Cochran Lane

Neil Hunter Ray

Bryan Shaw

The addition of a low softening point glass of Tg 300.degree.C and optionally a blowing agent, to a reinforced thermosetting composite material gives fire retardant properties to the product. Smoke emission on burning is less than for halogenated fire retardant additives. A preferred embodiment is GRP sheet containing a powdered phosphate glass and a blowing agent.

Fire retardant compositions

An isocyanate-based polymeric foam material having dispersed therein a particulate low-softening point inorganic oxide glass having a transformation temperature of not greater than 300.degree.C, and optionally a blowing agent which is capable of liberating a non-flammable gas on heating above a temperature in the range 150.degree. to 400.degree.C.

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Runcorn, United Kingdom

Bruce Cochran Lane