Multilayer pipe

Abstract

To provide a multilayer pipe having heat insulation performance and stable fire resistance.SOLUTION: The present invention provides a multilayer pipe 10 increasing a foam layer 2, an inner layer 1 disposed on the inner side of the foam layer 2, and an outer layer 3 disposed on the outer side of the foam layer 2, wherein at least one of the inner layer 1, the foam layer 2, and the outer layer 3 is a graphite-containing layer that comprises a thermoplastic resin, an expandable graphite, and a solid metal phosphate or phosphite.SELECTED DRAWING: Figure 1