FIELD: polymer materials. SUBSTANCE: new copolymers of tetrafluoroethylene and perfluoroalkylvinyl ethers with general formula I (see description) wherein n= 42-47 mol %, m=25-55 mol %, ρ=1-4 mol %, and a=1-7 mol % with molecular weight 100000-200000, intended for heat-resistant products, represent essentially noncrystallizable compounds imparting to vulcanizates obtained from them good physico-mechanical characteristics and high heat endurance in stressed state in combination with high stress index at 100% elongation. Vulcanizates based on proposed copolymers can be used as sealing materials fit to be operated in corrosive media at high temperatures in various areas. EFFECT: improved working characteristics. 1 tbl, 4 ex
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