FIELD: transport.
SUBSTANCE: invention relates to brake drive compressed air feed multiplayer pipes. Said pipe has outer, intermediate and inner layers. Outer and inner layers consist of moulding bulk containing, at least, 40 wt % of polyamide. Polyamide monomer blocks contain, on the average, eight carbon atoms. Intermediate layer consists of moulding bulk containing 70 to 99 wt % of polyamide selected from PA6, PA66, PA6/66 and mixes thereof and 1 to 30 wt % of plasticiser. Not here that said moulding bulk of intermediate layer does not contain impact viscosity modifier. Pipe OD varies from 6 to 20 mm. Wall thickness varies from 1.0 to 2.0 mm. Polypropylene layer thickness makes 25-75% of wall thickness Layers may be jointed together by adhesion promoter layer with thickness varying from 0.02 to 0.2 mm.
EFFECT: efficient production of pipe with high resistance to penetration, impact viscosity and resistance to ageing.
3 cl, 1 tbl
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