Steel pipe, fittings, joints and valves, lined with PTFE resin are rendered fire-safe for in excess of one hour exposure to open flames by jacketing the components with an enclosure formed from fibrous refractory material. The enclosures are configured and dimensioned to contain a substantially fixed...http://www.google.com.au/patents/US4046406?utm_source=gb-gplus-sharePatent US4046406 - Fire-safe jacket for fluid piping components
