FIELD: polymer materials. SUBSTANCE: composition for pressure tubes is constituted by multimodal polyethylene with density 0.930-0.965 g/cu.cm, melt flowability index 0.2-1.2 g/10 min, Mn = 8000-15000, Mw = 180000-330000, and Mw/Mn = 20-35. Multimodal polyethylene contains low-molecular ethylene homopolymer fraction and high-molecular ethylene copolymer fraction, ethylene copolymer having molecular weight at least 3500 and weight ratio of said low-molecular fraction to said high-molecular fraction being (35-55): (64-45). EFFECT: improved workability of pressure tubes and increased resistance against rapid cleavage propagation and impact strength. 15 cl, 2 dwg
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