GB/T 27572-2025 Rubber seals—Joint rings for pipelines for hot-water supply up to 110 ℃—Specification for the materials

Scope

This document specifies the material requirements for sulfurized rubber sealing rings used in drinking and non-drinking hot water supply pipelines. The markings of various sealing rings specified in this document are determined based on the level, purpose, and requirements of the sealing rings. This document also stipulates the general requirements for finished sealing rings. Since the performance of pipe joints is related to the material properties of the sealing rings, the geometric shape of the sealing rings, and the design of the joints, relevant product standards also specify additional requirements for specific application scenarios. This document is intended to be used in conjunction with product standards that specify the performance requirements of the joints when appropriate. This document applies to all pipe joint sealing rings, including cast iron pipes, steel pipes, ceramic pipes, cement pipes, reinforced cement pipes, plastic pipes, and fiberglass-reinforced plastic pipes. This document applies to the elastomeric parts of composite or non-composite sealing rings. For composite sealing rings made of materials with a hardness of 76 IRHD to 95 IRHD, the requirements for tensile elongation, compression permanent deformation, and stress relaxation only apply when the rubber material participates in the sealing function or when long-term stable use of the sealing is required. The material requirements specified in this document are designed for a potential service life of 50 years in hot water up to 110 °C. The material requirements specified in Appendix A are designed for a potential service life of 30 years in hot water up to 130 °C. The sealing life not only depends on the material properties, but also on other parameters not defined in this document, such as installation design, assembly quality, and integration with operating conditions. This document does not apply to pipe joint sealing rings made of foamed rubber materials.

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