| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a resin tube which is usable for a fuel cell by its being made (1) to have heat resistance, (2) not to contaminate pure water (no metal ions and sulfur ingredients contained in the resin are eluted into the pure water), (3) small in bend radius, and (4) a low price. <P>SOLUTION: Co-extrusion forming, with an adhesive fluororesin as the inner layer 10 side and a resin mixed with a heat-resistant agent and a polyamide resin as the outer layer 11 side, is carried out to make the resin tube 1 in which the sulfur detection amount and the electric conductivity of the pure water that has passed the tube are 0.1-30 mg/L and 0.2-40 μS/cm, respectively. Alternatively, co-extrusion forming is conducted with an adhesive fluororesin as the inner layer 10 side and a resin mixed with a plasticizer containing sulfur, a heat-resistant agent and a polyamide resin as the outer layer 11 side and then annealing treatment is conducted to make the resin tube 1. <P>COPYRIGHT: (C)2009,JPO&INPIT |
