| 摘要 |
The pipe has a polyphthalamide layer and another external layer of thermoplastic material, the pipe has a thickness that is formed mainly by a thickness of the polyphthalamide layer. The thickness of the polyphthalamide layer is five to ten times greater than the thickness of the layer of thermoplastic material. The external layer is made of a thermoplastic elastomer or a fluorinated polymer, which is terpolymer of tetrafluoroethylene, hexafluoropropylene, and fluorinated vinylidene. The external layer is directly in contact with the polyphthalamide layer.
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