This standard is. Specifies watertight rubber (hereinafter referred to as rubber) used in water pipe fittings and valves. However, the leachability of rubber used in water supply equipment and equipment intended for passing heated water through trees is outside the scope of this standard.
JIS K 6353:1997 history
2023JIS K 6353:2023 Rubber seals -- Joint parts for water supply, drainage and sewerage pipelines