This Part 508 of IEC 6081 1 gives the procedure for a pressure test at high temperature, which typically applies to thermoplastic compounds used for insulating and sheathing materials.
NOTE 1 The method is principally intended for thermoplastic materials, but may be used for cross-linked materials when specifically required by the relevant cable standard.
NOTE 2 The test method is not recommended for thicknesses below 0,7 mm.
