GB/T 27572-2025Rubber seals - Joint rings for pipelines for hot-water supply up to 110-degree Celcius - Specification for the materials (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

Drafting.

This document replaces GB/T 27572-2011 "Rubber Seals - Pipe Interface Sealing Ring Material Specification for 110°C Hot Water Supply Pipelines".

Compared with GB/T 27572-2011, the main technical changes in the "Standard" are as follows, apart from structural adjustments and editorial modifications.

a) Added the statement that "the material requirements specified in Appendix A are designed for a potential lifespan of 30 years in hot water at a maximum temperature of 130°C".

Scope of application (see Chapter 1 and Appendix A);

b) The ratings of elastomeric seals, determined by application and requirements, have been changed (see 4.2 and Table 2, Table 3 in the 2011 edition);

c) The material physical performance requirements for a continuous supply of hot water at 110°C have been removed (see Chapter 3 and Table 2 of the 2011 edition);

d) Two new material types and classifications for pipe joint sealing rings have been added (see 4.3);

e) Added the requirement that "if the product with the pipe joint sealing ring is used in drinking water, add 'D' after the grade, separated by a comma" (see [link to product description]).

f) Increased physical property requirements for Type A and Type B materials used in T1, T2, and T3 applications (see Tables 3-8);

g) The relevant content in the chapters and clauses regarding the requirements for finished sealing rings has been revised and adjusted (see 5.2, see 4.2 in the 2011 edition);

h) Change the finished seal's "Compression set in water (for IIR seals)" to "Compression set in water".

The requirements were revised, and related testing requirements were added (see 5.2.11, 4.2.11 in the 2011 version);

i) Added hardness classification and low ozone resistance to the identification code [see 9f) and 9g)];

j) The title of Appendix B has been changed from "Determination of Compression Permanent Deformation of Butyl Rubber Sealing Rings in Hot Water at 110°C" to "[]".

Revised to "Determination of compression set of the sealing ring in hot water at 110°C (see Appendix B, Appendix B of the 2011 edition);"

k) The materials of the pressure plate and the limiter of the compression clamp have been changed from "copper or aluminum" to "stainless steel".

The diameter was changed from "phi32" to "phi90", the thickness was changed from "3" to "8", and the compression screw was changed from "single screw" to "three screw" (see Figure B.1).

Figure B.1 (2011 edition)

l) The material and volume requirements for the aging tank have been added to Appendix B (see B.2.2);

(m) Appendix B has been amended to specify the requirements for the test specimens. The specimens are finished O-rings with an inner diameter of 20mm~40mm and a cross-sectional diameter of (3±) 0.1) mm (see B.3).

This document is modified to adopt ISO 9631:2018 "Rubber seals - Pipe joint sealing ring material specification for hot water supply pipes at 110°C".

Compared with ISO 9631:2018, this document has undergone the following structural adjustments.

---Appendix A (Normative) has been added. "Technical Requirements for the Use of Sealing Rings in Hot Water Up to 130°C";

---Appendix C corresponds to Appendix A in ISO 9631:2018;

---Appendix D corresponds to Appendix C in ISO 9631:2018;

---Appendix E corresponds to Appendix D in ISO 9631:2018.

The main technical differences between this document and ISO 9631:2018, and the reasons therefor, are as follows.

---Added. "The material requirements specified in Appendix A are designed for a potential lifespan of 30 years in hot water up to 130°C." (See Chapter 1 and Appendix A) to adapt to my country's technological conditions;

---The normatively referenced GB/T 18991-2003 has replaced ISO 10508:2006 (see Tables 2, 4.2, and ISO 9631:2018).

Tables 2 and 4.2) are used to adapt to my country's technological conditions.

---ISO 7743 has been replaced with the normative reference GB/T 7757, and the reference references have been changed to normative references (see 5.2.2).

ISO 9631:2018, 5.2.2), to adapt to my country's technical conditions;

---The normative reference GB/T 6031 has replaced ISO 48 (see Tables 3-8, 5.2.3, and Table 3 of ISO 9631:2018).

Table 8, 5.2.3), to adapt to my country's technological conditions;

---The normative reference GB/T 528 has replaced ISO 37 (see Tables 3-8, 5.2.4, Tables 3-8 of ISO 9631:2018).

5.2.4), to adapt to my country's technological conditions;

---The normatively referenced GB/T 7759.1 replaces ISO 815-1 (see Tables 3-8, 5.2.5, ISO 9631:2018).

Tables 3-8, 5.2.5), to adapt to my country's technological conditions;

---The normative reference GB/T 3512 has replaced ISO 188:2011 (see Tables 3-8, 5.2.6, ISO 9631:2018).

Tables 3-8, 5.2.6), to adapt to my country's technological conditions;

---ISO 3384-1:2011 (see Tables 3-8, 5.2.7, ISO 9631.) has been replaced by the normatively referenced GB/T 1685-2008.

Tables 3-8 (2018, 5.2.7) are used to adapt to my country's technological conditions;

---The normative reference GB/T 1690 has replaced ISO 1817 (see Tables 3-8, 5.2.8, Table 3 of ISO 9631:2018).

Table 8, 5.2.8), to adapt to my country's technological conditions;

---The normatively referenced GB/T 7762 has replaced ISO 1431-1 (see Tables 3-8, 5.2.9, Table 3 of ISO 9631:2018).

Table 8, 5.2.9), to adapt to my country's technological conditions;

---The normative reference GB/T 12829 has replaced ISO 34-2 (see Tables 3-8, 5.2.10, Table 3 of ISO 9631:2018).

Table 8, 5.2.10), to adapt to my country's technological conditions;

---ISO 3302-1 (see 5.2.1, ISO 9631:2018) has been replaced with the normatively referenced GB/T 3672.1 to accommodate [the new standard].

my country's technological conditions;

---The normatively referenced standard GB/T 9871-2008 replaces ISO 6914:2013 (see 5.2.1, ISO 9631:2018).

5.2.1), to adapt to my country's technological conditions;

---ISO 23529 (see 6.1, ISO 9631:2018) has been replaced with the normatively referenced GB/T 2941 to adapt to my country's national standards.

Technical conditions;

---ISO 1629 [see Chapter 9e), Chapter 9e of ISO 9631:2018] has been replaced by the normatively referenced GB/T 5576.

Adapting to my country's technological conditions;

---Hardness classification has been added to the identification codes [see Chapter 9f)] to adapt to my country's technical conditions;

---Added the life prediction method for 130°C hot water (GB/T 27800) (see Tables A.1 and A.2.5);

---ISO 15510 (see B.2.2, B.2.2 of ISO 9631:2018) has been replaced with the normatively referenced GB/T 20878 to accommodate [the new standard].

my country's technological conditions.

---The diameter of the pressure plate in the compression clamp has been changed from "phi45" to "phi90", and the thickness has been changed from "3" to "8". The compression screw has also been changed from...

The "single screw" was changed to a "three screw" (see Figure B.1, Figure B.1 of ISO 9631:2018) to enhance the operability of the experiment;

---The material requirements for the aging tank have been changed to "steel X6CrNiMoTi17-12-2, X2CrNiMo17-12-2 or X5CrNiMo17-12-".

"2" should be changed to "steel 06Cr17Ni12Mo3Ti, 022Cr17Ni12Mo2 or 06Cr17Ni12Mo2" (see B.2.2).

ISO 9631:2018, B.2.2), to adapt to my country's technical conditions;

---The O-ring size has been changed; the inner diameter has been changed from "15mm~40mm" to "20mm~40mm", and the cross-sectional diameter has been changed from "(3±" to "20mm~40mm".

The value of "0.3)mm" was changed to "(3±0.1)mm" (see B.3, B.3 of ISO 9631:2018) to improve the operability of the test.

The following editorial changes have been made to this document.

---The table footnote "Based on EN253" has been deleted (see footnote 2 of ISO 9631:2018);

---Additional information on the impact on water quality has been removed (see note 5.1.2 of ISO 9631:2018);

---The expression for ozone concentration has been changed from "pphm" to "10-8" (see 5.2.9 of ISO 9631:2018);

---The testing rate for the strength of the sealing ring or sample joint has been changed from "(8.3±0.8) mm/s" to "(500±50) mm/min" (see...) C.3, A.3 of ISO 9631:2018.

Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed by the China Petroleum and Chemical Industry Federation.

This document is under the jurisdiction of the National Technical Committee on Standardization of Rubber and Rubber Products (SAC/TC35).

1 Scope

This document specifies the material requirements for vulcanized rubber seals used in drinking and non-drinking hot water supply pipelines.

The markings for various sealing rings specified in this document are determined based on the sealing ring's grade, application, and requirements.

This document also specifies the general requirements for finished sealing rings. The performance of pipe joints is related to the properties of the sealing ring material and the geometry of the sealing ring.

Regarding the design of the form and interface, relevant product standards also specify additional requirements for specific application scenarios. This document is intended to address these requirements where appropriate.

Use with product standards that specify interface performance requirements.

This document applies to cast iron pipes, steel pipes, ceramic pipes, cement pipes, reinforced concrete pipes, plastic pipes, and glass fiber reinforced plastic pipes.

All pipe joint seals, including those for material pipes and pipelines.

This document applies to the elastomeric portion of composite or non-composite sealing rings. It is applicable to materials with a hardness of 76 IRHD to 95 IRHD.

Composite sealing rings are only suitable for applications requiring high elongation at break and high compression ratios when the rubber material is involved in the sealing function or when long-term stable sealing is required.

Requirements for permanent deformation and stress relaxation.

The material requirements specified in this document are designed for a potential lifespan of 50 years, operating in hot water at temperatures up to 110°C. Appendix the material requirements specified in A are designed for a potential lifespan of 30 years in hot water up to 130°C. Sealing lifespan depends not only on the material...

Material performance also depends on other parameters not defined in this document, such as installation design, assembly quality, and combination with operating conditions.

This document does not apply to pipe fitting seals made of foamed rubber materials.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 528 Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber (GB/T 528-2009, ISO 37.

2005, IDT)

GB/T 1685-2008 Determination of compressive stress relaxation in vulcanized or thermoplastic rubber at room temperature and high temperature (GB/T 1685-2008, ISO 3384:2005, MOD) GB/T 1690 Test methods for resistance to liquids of vulcanized or thermoplastic rubber (GB/T 1690-2010, ISO 1817:2005) MOD) GB/T 2941 General procedures for specimen preparation and conditioning in physical testing of rubber (GB/T 2941-2025, ISO 23529.

2016, IDT)

GB/T 3512 Accelerated aging and heat resistance tests of vulcanized rubber or thermoplastic rubber in hot air (GB/T 3512-2014, ISO 188.

2011, IDT)