DIN ISO 7258-1987 航空航天.航空航天用聚四氟乙烯(PTFE)软管.密度和相对密度的测定方法.与ISO7258, 1984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