DIN ISO 7258:1987-02

This international standard specifies three methods for the determination of the density and relative desity of polytetrafluoroethylene (PTFE) tubing used in the manufacture of medium and high pressure, high temperature, PTFE hose assemblies for aerospace applications: method A: density gradient column method without a preconditioning heating and cooling cycle. Method B: displacement of water and determination of change of weight method. Method C: density gradient column method with a preconditioning heating and cooling cycle.