DIN EN 922:1995 Plastic pipe and protective pipe systems Pipes and fittings made of plasticizer-free polyvinyl chloride (PVC-U) Preparation of samples to determine the viscosity number and calculate the K value
2011DIN EN ISO 13229:2011 Thermoplastics piping systems for non-pressure applications - Unplasticized poly(vinyl chloride) (PVC-U) pipes and fittings - Determination of the viscosity number and K-value (ISO 13229:2010); German version EN ISO 13229:2011
1994DIN EN 922:1995 Plastic pipe and protective pipe systems Pipes and fittings made of plasticizer-free polyvinyl chloride (PVC-U) Preparation of samples to determine the viscosity number and calculate the K value