Stable evacuable mold with a shape obtained by thermoforming at temperatures ≤ 240°C and corresponding to the respective fiber-composite plastics component to be produced therewith, and made of an at least two-layer vacuum-tight thermoplastic film comprising a) a surface layer made of at least one thermoplastic polyamide or copolyamide which optionally has functional groups, and b) a release layer forming the internal side of the mold and made of at least one thermoplastic tetrafluoroethylene copolymer, which has functional groups, composed of b1) α) copolymerized units of tetrafluoroethylene and γ) copolymerized units of monounsaturated aliphatic dicarboxylic acids or cyclic anhydrides thereof, and also δ) copolymerized units of at least one fluorinated monomer differing from tetrafluoroethylene, selected from the group consisting of CF 2 =CFOR 1, where R 1 is a C 1-10 perfluoroalkyl moiety which can comprise an oxygen atom, of CF 2 =CF(CF 2)pOCF=CF 2, where p is 1 or 2, of perfluoro (2-methylene-4-methyl-1,3 dioxolane and CH 2 =CX 3 (CF 2) Q X 4, where X 3 is a hydrogen atom or a fluorine atom, Q is an integer from 2 to 10 and X 4 is a hydrogen atom or a fluorine atom, and/or β) copolymerized units of C 2 -C 4 olefins, or b2) an olefin/tetrafluoroethylene copolymer which has been modified by free-radical grafting of from 0.01 to 5 mol% of carboxy groups, hydroxy groups, ester groups, isocyanate groups, epoxy groups, amide groups or cyclic anhydride groups, where the plastics film has no tie layer between the layers a) and b). a) a surface layer made of at least one thermoplastic polyamide or copolyamide which optionally has functional groups, and b) a release layer forming the internal side of the mold and made of at least one thermoplastic tetrafluoroethylene copolymer, which has functional groups, composed of b1) α) copolymerized units of tetrafluoroethylene and γ) copolymerized units of monounsaturated aliphatic dicarboxylic acids or cyclic anhydrides thereof, and also δ) copolymerized units of at least one fluorinated monomer differing from tetrafluoroethylene, selected from the group consisting of CF 2 =CFOR 1, where R 1 is a C 1-10 perfluoroalkyl moiety which can comprise an oxygen atom, of CF 2 =CF(CF 2)pOCF=CF 2, where p is 1 or 2, of perfluoro (2-methylene-4-methyl-1,3 dioxolane and CH 2 =CX 3 (CF 2) Q X 4, where X 3 is a hydrogen atom or a fluorine atom, Q is an integer from 2 to 10 and X 4 is a hydrogen atom or a fluorine atom, and/or β) copolymerized units of C 2 -C 4 olefins, or b2) an olefin/tetrafluoroethylene copolymer which has been modified by free-radical grafting of from 0.01 to 5 mol% of carboxy groups, hydroxy groups, ester groups, isocyanate groups, epoxy groups, amide groups or cyclic anhydride groups, where the plastics film has no tie layer between the layers a) and b). b1) α) copolymerized units of tetrafluoroethylene and γ) copolymerized units of monounsaturated aliphatic dicarboxylic acids or cyclic anhydrides thereof, and also δ) copolymerized units of at least one fluorinated monomer differing from tetrafluoroethylene, selected from the group consisting of CF 2 =CFOR 1, where R 1 is a C 1-10 perfluoroalkyl moiety which can comprise an oxygen atom, of CF 2 =CF(CF 2)pOCF=CF 2, where p is 1 or 2, of perfluoro (2-methylene-4-methyl-1,3 dioxolane and CH 2 =CX 3 (CF 2) Q X 4, where X 3 is a hydrogen atom or a fluorine atom, Q is an integer from 2 to 10 and X 4 is a hydrogen atom or a fluorine atom, and/or β) copolymerized units of C 2 -C 4 olefins, or α) copolymerized units of tetrafluoroethylene and γ) copolymerized units of monounsaturated aliphatic dicarboxylic acids or cyclic anhydrides thereof, and also δ) copolymerized units of at least one fluorinated monomer differing from tetrafluoroethylene, selected from the group consisting of CF 2 =CFOR 1, where R 1 is a C 1-10 perfluoroalkyl moiety which can comprise an oxygen atom, of CF 2 =CF(CF 2)pOCF=CF 2, where p is 1 or 2, of perfluoro (2-methylene-4-methyl-1,3 dioxolane and CH 2 =CX 3 (CF 2) Q X 4, where X 3 is a hydrogen atom or a fluorine atom, Q is an integer from 2 to 10 and X 4 is a hydrogen atom or a fluorine atom, and/or β) copolymerized units of C 2 -C 4 olefins, or b2) an olefin/tetrafluoroethylene copolymer which has been modified by free-radical grafting of from 0.01 to 5 mol% of carboxy groups, hydroxy groups, ester groups, isocyanate groups, epoxy groups, amide groups or cyclic anhydride groups, where the plastics film has no tie layer between the layers a) and b).