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GB/T 20025.3-2025Rubber and plastics hoses and hose assemblies for automotive air conditioning - Specification - Part 3: Refrigerant 1234yf (English PDF)

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Issued by

State Administration for Market Regulation

Level / Type

National · Recommended

Issue date

August 29, 2025

Implementation date

March 1, 2026

Scope

GB/T 20025.3-2025 (Rubber and plastics hoses and hose assemblies for automotive air conditioning - Specification - Part 3: Refrigerant 1234yf) is available as an English-translated PDF.

GB/T 20025.3-2025 — This document specifies the rubber or thermoplastic hoses and flexible conduits used in automotive air conditioning systems to circulate the liquid and gas R1234yf (tetrafluoropropylene).

Requirements for hose assemblies. The design of hoses and hose assemblies should limit refrigerant loss and system contamination. Operating temperature range. -40°C~ 125°C. Because the connection between the hose and the fitting is critical in the application, it is specified that the hose used in actual operation should be used in the test. Requirements for the connector.

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Document preview — GB/T 20025.3-2025

National Standard of the People's Republic of China

ICS: 43.040.60; 83.140.40
Classification: G 42

Issued by: State Administration for Market Regulation

Preface
Introduction
1 Scope
2 Normative References
3 Terms and Definitions
4 Classification
4.1 Type
4.2 Pressure Rating
4.3 Water Erosion Level
4.4 Refrigerant Permeability Level
5 Size
5.1 Hoses inner diameter
5.2 Hose wall thickness deviation
6 Testing and Performance Requirements
6.1 Test Conditions
6.2 Leakage
6.3 Refrigerant Permeation
6.4 Aging
6.5 Low Temperature Test
6.6 Decompression Test
6.7 Length Change under Pressure
6.8 Minimum burst pressure
6.9 Verification of Pressure
6.10 R1234yf extraction
6.11 Ozone resistance
6.12 Hose cleanliness
6.13 Pulse Test
6.14 Moisture Penetration Test
6.15 Overall connection integrity (sealing)
7 Inspection frequency 9.
8 Mark
9 Test Report
10 Recommendations regarding packaging and storage 9.
Appendix A (Normative) Determination of Refrigerant Permeability
A.1 Principle
A.2 Instrument
A.3 Assembly Sample
A.4 Program
A.5 Calculation
A.6 Test Report
Appendix B (Normative) Low Temperature Test
B.1 Principle
B.2 Test Assembly
B.3 Program
B.4 Test Report
Appendix C (Normative) R1234yf Determination of the Quantity of Substance Extracted from a Tube
C.1 Principle
C.2 Test Assembly
C.3 Program
C.4 Representation of Results
C.5 Test Report
Appendix D (Normative) Pulse Test
D.1 Principle
D.2 Equipment
D.3 Test Fluid
D.4 Test temperature
D.5 Sample
D.6 Program
D.7 Result indicates
D.8 Test Report
Appendix E (Normative) Moisture Penetration Test
E.1 Result indicates
E.2 Equipment and Materials (see Figure E.1)
E.3 Test Assembly
E.4 Program
E.5 Calculation
E.6 Test Report
Appendix F (Normative) Connection Integrity (Sealing)
F.1 Principle
F.2 Test Assembly
F.3 Program
F.4 Representation of Results
F.5 Test Report
Appendix G (Normative) Inspection Frequency
Appendix H (Informative) Production Acceptance Inspection
References

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 is Part 3 of GB/T 20025.GB/T 20025 has the following parts published.

---GB/T 20025.2 Rubber and plastic hoses and hose assemblies for automotive air conditioning systems, resistant to refrigerant 134a;

---GB/T 20025.3 Specification for rubber and plastic hoses and hose assemblies for automotive air conditioning - Part 3: Refrigerants 1234yf.

This document is equivalent to ISO 8066-3:2020 "Rubber and plastic hoses and hose assemblies for automotive air conditioning - Part 3.

Refrigerant 1234yf.

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).

Introduction

Automotive air conditioning rubber and plastic hoses and hose assemblies are classified according to the refrigerant they transport. Commonly used refrigerants include...

134a and 1234yf, etc. GB/T 20025 "Specification for Rubber and Plastic Hoses and Hose Assemblies for Automotive Air Conditioning" is based on ISO 8066.

The draft standard GB/T 20025, "Specification for Rubber and Plastic Hoses and Hoses for Automotive Air Conditioning", is proposed to consist of three parts.

---Part 2: Refrigerant 134a Resistant. The purpose is to meet the requirements for rubber and plastic hoses and flexible conduits used in automotive air conditioning systems for conveying refrigerant 134a.

The usage requirements of pipe assembly components.

---Part 3: Refrigerant 1234yf. The purpose is to meet the requirements of rubber and plastic hoses for automotive air conditioning systems that transport refrigerant 1234yf.

Usage requirements for hose assemblies.

---Part 4: Low Vibration Transmission Type for Refrigerant 1234yf. The aim is to meet the requirements for low vibration transmission when transporting refrigerant 1234yf.

The demand for rubber and plastic hoses and hose assemblies for automotive air conditioning systems.

Rubber and plastic hoses for automotive air conditioning and hose assembly specifications Part 3: Refrigerant 1234yf Warning. This document should be used by personnel with practical experience in formal laboratory work. This document does not address all potential safety issues.

Users are responsible for taking appropriate safety and health measures and ensuring compliance with relevant national regulations.

1 Scope

This document specifies the rubber or thermoplastic hoses and flexible conduits used in automotive air conditioning systems to circulate the liquid and gas R1234yf (tetrafluoropropylene).

Requirements for hose assemblies. The design of hoses and hose assemblies should limit refrigerant loss and system contamination. Operating temperature range.

-40°C~ 125°C.

Because the connection between the hose and the fitting is critical in the application, it is specified that the hose used in actual operation should be used in the test.

Requirements for the connector.

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 9573-2013 Rubber and plastic hoses and hose assemblies - Methods for measuring hose dimensions and hose assembly length (ISO 4671:2007, IDT) assemblies-Hydrostatic testing) Note. GB/T 5563-2025 Hydrostatic test method for rubber and plastic hoses and hose assemblies (ISO 1402:2021, IDT) Note. GB/T 24134-2009 Evaluation of ozone resistance under static conditions for rubber and plastic hoses (ISO 7326:2006, IDT) (assemblies-Vocabulary) Note. GB/T 7528-2025 Terminology for rubber and plastic hoses and hose assemblies (ISO 8330:2022, IDT) Note. GB/T 2941-2025 General procedures for specimen preparation and conditioning in physical testing of rubber (ISO 23529:2016, IDT) ISO/T R11340 Rubber and Rubber Products Hydraulic Hose Assemblies Hydraulic Systems External Leakage Classification (Rubber and Rubber) Note. GB/Z 18427-2001 Hydraulic hose assemblies - Classification of external leakage in hydraulic systems (ISO/T R11340.1994, IDT)

3 Terms and Definitions

The terms and definitions defined in ISO 8330 apply to this document.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 26 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 4671 · ISO 1402 · GB/T 24134-2009 · ISO 7326 · ISO 8330 · ISO 23529

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