| 摘要 |
The thermoplastic pipe body (1) is provided with a polyurethane foam layer (4) which has a closed skin. The polyurethane foam layer contains an inorganic filler for damping the noise nuisance. If the pipe is provided with a socket (2) having an internal groove (3) and an external flute (5), the external diameter of the polyurethane foam layer (4) is at most equal to the external diameter of the externally surrounding flute (5). <IMAGE> |
