Abstract: To insulate piping against passage of heat, cold and sound, there are used inter alia preformed insulating sleeves, wrapped glass or rock wool material etc. A continuous sheet-like, flexible covering material in the form of a semi-finished product is used for wrapping round the insulation, said product consisting of a multilayer laminate containing at least two layer groups, the first group forms the outer part of the sheet material when rolled up, and contains a supporting layer consisting of a kraft paper or the like with minor extensibility, and is covered on its outwardly facing surface with a polyethylene layer and similarly on its inner surface with a polyethylene or glue layer while the second group, that forms the inner part of the material when rolled up, contains a layer consisting of a highly extensible paper or the like, which is given a contracting tendency due to its striving to return to its original shape, by being given a high tensional load during manufacture.

Abstract: To insulate piping against passage of heat, cold and sound, there are used inter alia preformed insulating sleeves, wrapped glass or rock wool material etc. A continuous sheet-like, flexible covering material in the form of a semi-finished product is used for wrapping round the insulation, said product consisting of a multilayer laminate containing at least two layer groups, the first group forms the outer part of the sheet material when rolled up, and contains a supporting layer consisting of a kraft paper or the like with minor extensibility, and is covered on its outwardly facing surface with a polyethylene layer and similarly on its inner surface with a polyethylene or glue layer while the second group, that forms the inner part of the material when rolled up, contains a layer consisting of a highly extensible paper or the like, which is given a contracting tendency due to its striving to return to its original shape, by being given a high tensional load during manufacture.