BS M 56:1985

This standard BS M 56:1985 Methods for determination of density and relative density of polytetrafluoroethylene (PTFE) tubing for aerospace applications is classified in these ICS categories:

• 49.080 Aerospace fluid systems and components
• 83.140.40 Hoses

This International Standard specifies three methods for the determination of the density and relative density 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.

Specifies three methods for the determination of the density and relative density of PTFE tubing used in the manufacture of medium and high pressure hose assemblies for aerospace applications: 1. Density gradient column method without a preconditioning heating and cooling cycle. 2. Water displacement method. 3. Density gradient column method with a preconditioning heating and cooling cycle.