Historical
ISO 4633:2015
Rubber seals - Joint rings for water supply, drainage and sewerage pipelines - Specification for materials
ISO 4633:2015 specifies requirements for materials used in vulcanized rubber seals for the following:
a) cold drinking-water supplies (up to 50 °C);
b) drainage, sewerage, and rainwater systems (continuous flow up to 45 °C and intermittent flow up to 95 °C).
International Organization for Standardization [iso]