anti - adherent material for coming into contact with the epidermis such as sheets , surgical dressings , various kinds of bandages and the like are disclosed which comprise a homopolymer or copolymer of tetrafluoroethylene containing at least about 50 % tetrafluoroethylene deposited upon a support material which is resistant to the fritting temperature of the homopolymer or copolymer , the support material containing from about 25 to 90 % homopolymer or copolymer and from 10 to 75 % support material and possessing regularly disposed perforations for from about 0 . 1 to 10 % of the surface thereof .