| abstract |
Use, in a plastics pipe which comprises an inner core and an outer removable skin layer bonded thereto, wherein the outer removable skin layer comprises a polymeric material chosen for its physical and mechanical properties, of a nucleating agent for the polymeric material, the nucleating agent being present in the skin layer in an amount such that the adhesion of the skin layer to the inner core is sufficient to prevent substantial undesired relative movement between the skin layer and the core during installation, but insufficient to prevent the outer skin layer from being cleanly removed by peeling, at least at the ends of the pipe, and insufficient to cause a substantial reduction in the impact strength of the inner core. |