Abstract / scope
This document specifies a method of classification for determining the chemical resistance of unplasticized polyamide (PA-U) pipes, fittings and valve components designed for the conveyance of fluids in the absence of pressure and stress (e.g. due to earth loads or traffic loads, dynamic or internal stresses).
To determine the chemical resistance, the method uses the change in mass and the changes in tensile properties which result from the storage of test pieces, taken from such pipes, fittings and valve components, in chemicals. The test is carried out in accordance with ISO 4433-1.