A protective sleeve to be fitted over plastic pipework 2B comprises a hollow plastic pipe 4 of larger diameter than the plastic pipework over which it is to be fitted. The outer surface of the plastic pipe having a layer of fiberglass 6 secured to it, the fiberglass being coated or impregnated with an intumescent material. The fiberglass layer can have a thickness of about 4mm, and the plastic pipe can also have a wall thickness of about 4mm. Plastic pipework to which the sleeve can be fitted can comprise a pipe with a wall thickness of about 4mm.
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