GB/T 21873-2008
Rubber seals.Joint rings for water supply,drainage and sewerage pipelines.Specification for materials (English Version)

Standard No.

GB/T 21873-2008

Language

Chinese, Available in English version

Release Date

2008

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB/T 21873-2008

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.

GB/T 21873-2008 Referenced Document

• GB/T 12832-2008 Rubber.Determination of crystallization effects by hardness measurements
• GB/T 1685-2008 Rubber,vulcanized or thermoplastic.Determination of stress relaxation in compression at ambient and at elevated temperatures*， 2008-05-15 Update
• GB/T 1690-1992 Rubber, vulcanized-Determination of the effect of liquids
• GB/T 17604-1998 Rubber--Recommendations for the workmanship of pipe joint rings--Description and classification of imperfections
• GB/T 2941-2006 Rubber. General procedures for preparing and conditioning test pieces for physical test methods
• GB/T 3512-2001 Rubber,vulcanized or thermoplastic--Accelerated ageing and heat resistance tests-Air-oven method
• GB/T 3672.1-2002 Rubber-Tolerances of products--Part 1: Dimensional tolerances
• GB/T 528-1998 Rubber, vulcanized or thermoplastic--Determination of tensile stress-strain properties
• GB/T 5576-1997 Rubbers and latices--Nomenclature
• GB/T 6031-1998 Rubber, Vulcanized or thermoplastic--Determination of hardness (hardness between 10 IRHD and 100IRHD)
• GB/T 7759-1996 Rubber, Vulcanized or thermoplastic--Determination of compression set at ambient elevated or low temperatures
• GB/T 7762-2003 Rubber,vulcanized or thermoplastic--Resistance to ozone cracking--Static strain test
• GB/T 9871-2008 Rubber,vulcanized or thermoplastic.Determination of aging characteristics by measurement of stress relaxation
• ISO 2285:2001 Rubber, vulcanized or thermoplastic - Determination of tension set under constant elongation, and of tension set, elongation and creep under constant tensile load

GB/T 21873-2008 history

• 2008 GB/T 21873-2008 Rubber seals.Joint rings for water supply,drainage and sewerage pipelines.Specification for materials