DIN 16888-2
DIN 16888-2 Determination of chemical resistance of thermoplastics pipes; unplasticized polyvinyl chloride (PVC-U) pipes
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 08/01/1991
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 08/01/1991