| 摘要 |
PROBLEM TO BE SOLVED: To provide a low-cost tube which satisfies demand imposed on an air brake piping relating to the resistance to chemicals, engine oils, zinc chloride and scattered salt, and which has high burst pressure strength and low-temperature impact resistance. SOLUTION: The tube comprises the following layers: I. an outer layer comprising a molding material including up to at least 40 mass%, up to at least 45 mass%, up to at least 50 mass%, up to at least 55 mass%, or up to at least 60 mass% of a polyamide a monomer unit of which has at least eight, at least nine, or at least ten carbon atoms; II. optionally a layer which comprises an adhesive molding material; and III. a layer which comprises a polypropylene molding material. Advantageously, wherein these layers are directly combined. COPYRIGHT: (C)2007,JPO&INPIT |
