GB/T 16840.8-2021 English PDF

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GB/T 16840.8-2021: Technical determination methods for electrical fire evidence - Part 8: Method of thermal analysis
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Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 16840.8-2021	279	Add to Cart	3 days	Technical determination methods for electrical fire evidence - Part 8: Method of thermal analysis	Valid

Similar standards

GB/T 16840.2   GB/T 14403   GB/T 14402   GB/T 16840.4   GB/T 16840.7   GB/T 16840.3   

Basic data

Standard ID: GB/T 16840.8-2021 (GB/T16840.8-2021)
Description (Translated English): Technical determination methods for electrical fire evidence - Part 8: Method of thermal analysis
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: C80;C89
Word Count Estimation: 14,196
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 16840.8-2021: Technical determination methods for electrical fire evidence - Part 8: Method of thermal analysis

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Technical determination methods for electrical fire evidence - Part 8.Method of thermal analysis ICS 13.220.20 CCSC80/89 National Standards of People's Republic of China Technical Appraisal Method of Electrical Fire Trace Material Evidence Part 8.Thermal Analysis Method Released on 2021-08-20 2021-08-20 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee

Table of contents

Foreword Ⅲ Introduction Ⅳ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Principle 2 5 Equipment 2 5.1 Thermogravimetric Analyzer 2 5.2 Mini Calorimeter 2 6 Sample extraction 3 7 Sample preparation 3 7.1 Sample interception 3 7.2 Notes on interception 3 8 Sample filling 3 9 Test method 3 9.1 Overview 3 9.2 Thermogravimetric analysis 4 9.3 Microcalorimetric analysis 4 9.4 Test Step 4 9.5 Spectrum analysis 4 10 Judgment basis 6 10.1 The insulation layer is burnt and the inner layer is heavier than the outer layer. Judgment basis 6 10.2 The insulation layer is burnt and the outer layer is heavier than the inner layer. Judgment basis 6 10.3 Consistent judgment basis for the inner and outer layers of insulation layer burnt 6 11 Judgment result 6 Appendix A (informative) Thermogravimetric balance temperature calibration standard material 7 Appendix B (informative) Calibration method for oxygen sensor of miniature calorimeter 8

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" Drafting. This document is the 8th part of GB/T 16840 "Technical Appraisal Method for Electrical Fire Trace Material Evidence". GB/T 16840 has been released The following parts. ---Part 1.Macro Law; ---Part 2.Remanence detection method; ---Part 3.Auger analysis method; ---Part 4.Metallographic Analysis; ---Part 5.Identification and extraction methods of electrical fire material evidence; ---Part 6.SEM microscopic morphology analysis method; ---Part 7.EDS component analysis method; ---Part 8.Thermal analysis method. Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents. This document was proposed by the Ministry of Emergency Management of the People's Republic of China. This document is under the jurisdiction of the National Fire Standardization Technical Committee (SAC/TC113). This document was drafted by. Shenyang Fire Research Institute of the Ministry of Emergency Management, Shanghai Fire Research Institute of the Ministry of Emergency Management, and Tianjin Fire Protection of the Ministry of Emergency Management Research Institute, Sichuan Fire Research Institute of Emergency Management Department. The main drafters of this document. Liu Shujun, Wang Bai, Yu Lili, Gao Wei, Zhao Changzheng, Di Man, Bao Renlie, Deng Zhenyu, Zhang Yi.

Introduction

The identification of electrical fire evidence is an important part of the investigation of the cause of fire by emergency rescue and firefighting agencies, especially when it is accompanied by national The improvement of the legal system of the family, the enhancement of citizens’ awareness of the legal system, the identification of physical evidence has been used as strong evidence for the identification of the cause of the fire, and it is a fire rescue agency. The determination of the cause of the fire provides scientific, fast and accurate technical support. In this regard, my country has established a technology for evidence of electrical fire traces. National standard system for identification methods. In this standard system, GB/T 16840 "Technical Appraisal Method for Electrical Fire Trace Material Evidence" is a guide for me The method and basis for the relevant agencies of the country to engage in the identification of electrical fire evidence is planned to consist of eight parts, and the purpose is to establish Trace physical evidence for macro analysis, remanence analysis, Auger analysis, metallographic analysis, physical evidence identification and extraction, SEM microscopic morphology analysis, and component analysis And the method and basis for thermal analysis. ---Part 1.Macro Law; ---Part 2.Remanence detection method; ---Part 3.Auger analysis method; ---Part 4.Metallographic Analysis; ---Part 5.Identification and extraction methods of electrical fire material evidence; ---Part 6.SEM microscopic morphology analysis method; ---Part 7.EDS component analysis method; ---Part 8.Thermal analysis method. The wire insulation layer is a common type of physical evidence in the fire field. It is possible to analyze the burn damage of the inner and outer layers of the wire insulation layer residue. Provide more valuable information for fire investigators. The formulation of this document focuses on the first seven parts of GB/T 16840. The operation process, judgment basis and judgment result of the analytical method are specified in detail to ensure that the compilation of this document meets the requirements, and the content is practical, reliable. Technical Appraisal Method of Electrical Fire Trace Material Evidence Part 8.Thermal Analysis Method

1 Scope

This document specifies the principle of thermal analysis method, equipment, sample extraction, sample preparation, Sample filling, test method, judgment basis and judgment result. This document is applicable to the appraisal of the severity of burnt damage to the inner and outer layers of the insulation layer residues on the fire site.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to This document. GB/T 1844.1 Plastic symbols and abbreviations Part 1.Basic polymers and their characteristic properties GB/T 13464 Thermal analysis test method for material thermal stability GB/T 13966 Terminology for analytical instruments GB/T 19267.12 Physical and Chemical Examination of Trace Material Evidence in Criminal Technology Part 12.Thermal Analysis Method

3 Terms and definitions

GB/T 13464, GB/T 13966, GB/T 1844.1, GB/T 19267.12 and the following terms and definitions apply to this document. 3.1 Methodofthermalanalysis A method of measuring the relationship between the physical properties of a substance and the temperature under program temperature control. 3.2 Thermogravimetry;TG A method of measuring the relationship between the quality of a sample and the temperature or time under program temperature control and a certain atmosphere. 3.3 Microcalorimetry microscalecombustioncalorimeter;MCC A method to measure the complete oxidation and combustion performance of the gaseous decomposition products of a sample under a programmed temperature and a certain atmosphere. 3.4 Innersideofinsulationlayer The surface layer where the wire insulation layer is in contact with the metal conductor. 3.5 Outersideofinsulationlayer The surface layer of the wire insulation layer directly exposed to the air. ......

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