GB/T 21873-2008 in English

《GB/T 21873-2008橡胶密封件 给、排水管及污水管道用接口密封圈 材料规范》由TC35（全国橡胶与橡胶制品标准化技术委员会）归口，TC35SC3（全国橡胶与橡胶制品标准化技术委员会密封制品分会）执行，主管部门为中国石油和化学工业联合会。
本标准规定了下列管道用的硫化橡胶密封圈材料的要求：
ａ）冷饮用水（50℃以下）供应管；
ｂ）排水管、污水管及雨水管（对连续流动水，工作温度在45℃ 以下；对间歇流动水，工作温度可达95℃）。 本标准适用于包括铸铁管、钢管、陶瓷管、石棉水泥管、水泥管、钢筋水泥管、塑料管及玻璃纤维增强塑料管等所有管道接口密封圈。本标准适用于复合的或非复合的橡胶密封圈的弹性体部分。 本标准修改采用国际标准ＩＳＯ４６３３：２００２《橡胶密封件　给、排水管道接口密封圈　材料规范》（英
文版）。本标准根据ＩＳＯ４６３３：２００２重新起草。

Scope

This standard specifies the requirements for vulcanized rubber sealing ring materials for the following pipelines: a) cold drinking water (below 50°C) supply pipes; b) drain pipes, sewage pipes and rainwater pipes (for continuous flowing water, the working temperature is below 45°C; For intermittent flowing water, the working temperature can reach 95°C). The identification codes of various sealing rings specified in this standard are determined according to the type, use and requirements of the sealing ring (see Table 3). This standard also specifies general requirements for finished seal rings, and additional requirements for special applications shall be specified in the corresponding product standards. It should be noted that the performance of the pipe joint is related to the performance of the sealing ring material, the geometry of the sealing ring and the structure of the pipe joint. This standard shall be used in conjunction with product standards specifying the performance of pipe joints, as applicable. This standard applies to all pipe joint sealing rings including cast iron pipes, steel pipes, ceramic pipes, asbestos cement pipes, cement pipes, reinforced concrete pipes, plastic pipes and glass fiber reinforced plastic pipes. This standard applies to the elastomeric portion of compounded or non-compounded rubber seals. For composite sealing rings with material hardness ranging from 76 IRHD to 95 IRHD, requirements such as elongation at break, compression set and stress relaxation are used only when the rubber directly participates in the sealing or when the sealing ring is required to be stable for a long time. Joint seals made of closed-cell material as part of the seal are also within the scope of this standard.