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GB/T 47119-2026: Testing method for determination of thermal stability of organic heat transfer fluids - Gas chromatography with internal standard method
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GB/T 47119-2026: Testing method for determination of thermal stability of organic heat transfer fluids - Gas chromatography with internal standard method

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ICS 27.060.30 CCSE34 National Standards of the People's Republic of China Determination of thermal stability of organic heat transfer fluid Gas chromatography internal standard method Published on 2026-01-28 Implemented on January 28, 2026 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Table of contents

Preface III 1.Scope 1 2 Normative References 1 3.Terms and Definitions 1 4.Method Overview 2 5.Instruments and Equipment 2 6 Materials and Reagents 3 7.Samples and Sample Processing 3. 8.Gas Chromatograph Setup 3 9.Determination and Calculation of Relative Correction Factor 4 10.Determination of samples after heating 4 11 Precision 5 12 Test Reports 5 Appendix A (Informative). Determination of Main Component Peak Retention Time and Examples of Main Component Peak Retention Time in Common Synthetic Organic Heat Transfer Fluids (7) Reference 11

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. 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 and is under the jurisdiction of the National Technical Committee on Standardization of Boilers and Pressure Vessels (SAC/TC262). This document was drafted by. China Boiler and Boiler Water Treatment Association, Suzhou Shounuo Thermal Oil Co., Ltd., and Guangzhou Special Equipment Inspection and Research Institute. Institute, Jilin Hengsheng Chemical Co., Ltd., Shandong Beifang Zibo Special Oil Co., Ltd., Shanghai Lanya Petrochemical Equipment Testing Institute of Machinery Industry Limited Company, Taian Special Equipment Inspection and Research Institute, Wuhai Branch of Inner Mongolia Autonomous Region Special Equipment Inspection and Research Institute, Dalian Boiler and Pressure Vessel Inspection and Testing Research Institute Co., Ltd., Zibo Special Equipment Inspection and Research Institute, Henan Provincial Boiler and Pressure Vessel Inspection Technology Research Institute Hubei Special Equipment Inspection and Testing Institute. The main drafters of this document are. Wang Jiaoling, Lu Weihong, Mao Li, Wang Hui, Li Fuliang, Yao Guoping, Jia Bingli, Wang Haizhong, Niu Chengjie, and Zhao Bo. Zhang Wenhui, Song Xiaolin, Li Feixiang, Du Yuhui, Li Ziyun, Su Chen. Determination of thermal stability of organic heat transfer fluid Gas chromatography internal standard method

1 Scope

This document describes a method for determining the thermal stability of organic heat transfer fluids using gas chromatography with internal standard. This document applies to the thermal stability of unused synthetic organic heat transfer fluids with relatively simple components and a distillation range (at atmospheric pressure) of less than 55°C. Measurement. This document is not applicable to the determination of the thermal stability of organosilicon heat transfer fluids.

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 4756 Manual Sampling Method for Petroleum Liquids GB/T 4946 Gas Chromatography Terminology GB 4962 Safety Technical Regulations for the Use of Hydrogen GB/T 9722-2023 General Rules for Gas Chromatography of Chemical Reagents GB/T 23800-2009 Determination of thermal stability of organic heat transfer fluids GB 23971 Organic Heat Transfer Fluid GB/T 30430-2019 Standard Columns for Gas Chromatography HG/T 3115 Performance of Borosilicate Glass 3.3

3 Terms and Definitions

The terms and definitions defined in GB/T 4946 and GB 23971, as well as the following terms and definitions, apply to this document. 3.1 A certain amount of pure substance is added as an internal standard to a certain amount of the sample to be tested, and then the sample containing the internal standard is subjected to chromatography. Analysis was performed, and the peak areas of the internal standard and the analyte were measured separately. Based on the measured relative correction factor, the content of the analyte in the sample was calculated. The method. 3.2 thermal stability Organic heat transfer fluids, under specified heating conditions, resist chemical reactions such as thermal decomposition, oxidation, and polymerization, and maintain their physicochemical properties (such as viscosity). The ability of a substance (such as temperature, flash point, acid value, etc.) to remain within permissible ranges. [Source. GB 23971-2009, 3.7, with modifications] 3.3 original sample Samples without organic heat transfer fluid used for thermal stability testing. ...