6DIN 16833, Publication date:2001-06Polyethylene pipes of raised temperature resistance-General quality requirements, testing.
7DIN 4721, Publication date:2001-06Plastic piping systems for warm water floor heating systems and radiator connecting - Polyethylene of raised temperature resistance (PE-RT).
8ISO/DIS 15877-1.2:1999 Plastics piping systems for hot and cold water installations--Chlorinated poly ( vinyl chloride ) ( PVCC)--Part 1: General.
9ISO/DIS 15877-2.2:1999 Plastics piping systems for hot and cold water installations--Chlorinated poly ( vinyl chloride ) ( PVCC) )--Part 2: Pipes.