DIN ISO 7258:1987-02 航天;用于航空航天应用的聚四氟乙烯 (PTFE) 管;密度和相对密度的测定方法;与 ISO 7258 1984 版相同
Aerospace; polytetrafluoroethylene (PTFE) tubing for aerospace applications; methods for the determination of the density and relative density; identical with ISO 7258, edition 1984