This part of ISO 9393 specifies the test parameters and conditions for hydrostatic-pressure tests on valves made of the following thermoplastic materials: ⎯ ABS, as defined in ISO 15493 ⎯ PE 80, as defined in ISO 15494 ⎯ PE 100, as defined in ISO 15494 ⎯ PP-H, as defined in ISO 15494 ⎯ PP-B, as defined in ISO 15494 ⎯ PP-R, as defined in ISO 15494 ⎯ PP-R-GF ⎯ PVC-C, as defined in ISO 15493 ⎯ PVC-U, as defined in ISO 15493 ⎯ PVDF, as defined in ISO 10931