ISO 9631:2018规定了热饮用水和非饮用水供应（最高110°C）用硫化橡胶密封件的材料要求。 根据密封类型、密封应用和特定密封的要求，规定了不同的密封名称（见表2）。 还给出了成品接头密封件的一般要求。考虑到管道接头的性能是密封材料性能、密封几何形状和管道接头设计的函数，相关产品标准中规定了特定应用要求的任何附加要求。本文件将在适当情况下与规定接头性能要求的产品标准结合使用。 ISO 9631:2018适用于所有管道材料的接缝密封，包括金属、粘土、纤维水泥、混凝土、钢筋混凝土、塑料和玻璃- 增强塑料。 ISO 9631:2018适用于复合和非复合密封的弹性元件。对于由硬度范围为76 IRHD至95 IRHD的材料制成的复合密封件，只有当材料参与密封功能或有助于密封件的长期稳定性时，才适用断裂伸长率、压缩永久变形和应力松弛的要求。 本文件中规定的材料要求是为长期性能和50年的潜在使用寿命而设计的。密封件的使用寿命不仅取决于材料性能，还取决于本文件中未定义的其他参数，如安装设计、装配质量以及与工作条件的组合。本文件不包括由多孔橡胶材料制成的接合环。

ISO 9631:2018 specifies material requirements for vulcanized rubber seals for hot drinking and non-drinking water supply (up to 110 °C). The different seal designations specified are defined according to seal type, seal application and the requirements for a particular seal (see Table 2). General requirements for finished joint seals are also given. Any additional requirements called for by the particular application are specified in the relevant product standards, taking into account that the performance of pipe joints is a function of the seal material properties, seal geometry and pipe joint design. This document is intended to be used where appropriate, in conjunction with product standards which specify performance requirements for joints. ISO 9631:2018 is applicable to joint seals for use with all pipeline materials, including metals, clay, fibre cement, concrete, reinforced concrete, plastics and glass-reinforced plastics. ISO 9631:2018 is applicable to elastomeric components of composite and non-composite seals. In the case of composite seals made from materials with hardness ranging from 76 IRHD to 95 IRHD, the requirements for elongation at break, compression set and stress relaxation apply only when the material participates in the sealing function or contributes to the long-term stability of the seal. The material requirements specified in this document are designed for long term performances and a potential lifetime of 50 years. The lifetime of a sealing depends not only on material performance but also on other parameters which are not defined in this document like the mounting design, the quality of assembly and the combination with operating conditions. Joint rings made from cellular rubber materials are not covered by this document.