to about 200 u00b0 c depending upon its composition and viscosity the pipe walls maintained between their exterior and interior surfaces at a pressure differential of about one quarter to one half atmospheric pressure are impregnated with the heated resinous or asphaltic composition after which the impregnated pipe may be cooled to room temperature by water sprayed on the exterior surface of the pipe or by any other suitable means the impregnated pipe may be wound with a filament such as a resinous or glass filament the glass filament which is preferred has a denier of about 1 to about 15 preferably about 1 5 to about 10 0 the winding is carried out in any suitable manner since the process is a continuous process the preferred method of winding is to move the pipe past a conventional winding machine and wind the filament about the pipe as it is rotated the features and advantages of the present invention will become more clearly appreciated from the following description taken in conjunction with the accompanying figure which is a schematic cross sectional view of apparatus and a pipe formed therein from particulate materials the preferred embodiment of the process of the present invention is shown graphically in the figure a suitable particulate material coated with a mixture of an appropriate acid gas curable resin and an oxidizing agent is.