against fire or other external sources of extreme heat

Full Title

Protection of pipes or objects of similar shape against external or internal damage or wear ( supporting of pipes inside other pipes or sleeves F16L7/00; used in connection with end fittings of hoses F16L35/00; protection of pipes or pipe fittings against corrosion or incrustation F16L58/00; protection thereof during transport B65D59/00) > against fire or other external sources of extreme heat