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GB/T 42919.3-2023: Plastics - Determination of thermal conductivity and thermal diffusivity - Part 3: Temperature wave analysis method
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Plastics - Determination of thermal conductivity and thermal diffusivity - Part 3: Temperature wave analysis method
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GB/T 42919.3-2023
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Basic data | Standard ID | GB/T 42919.3-2023 (GB/T42919.3-2023) | | Description (Translated English) | Plastics - Determination of thermal conductivity and thermal diffusivity - Part 3: Temperature wave analysis method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G31 | | Classification of International Standard | 83.080.01 | | Word Count Estimation | 18,129 | | Date of Issue | 2023-08-06 | | Date of Implementation | 2024-03-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 42919.3-2023: Plastics - Determination of thermal conductivity and thermal diffusivity - Part 3: Temperature wave analysis method
---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.
ICS 83.080.01
CCSG31
National Standards of People's Republic of China
Determination of thermal conductivity and thermal diffusion coefficient of plastics
Part 3.Temperature wave analysis method
(ISO 22007-3.2008,MOD)
Published on 2023-08-06
2024-03-01 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration Committee
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 42919 "Determination of Thermal Conductivity and Thermal Diffusion Coefficient of Plastics". GB/T 42919 has been issued
The following parts have been published.
---Part 1.General principles;
---Part 3.Temperature wave analysis method;
---Part 4.Laser flash method;
---Part 6.Comparative method based on temperature modulation technology.
This document is modified to adopt ISO 22007-3.2008 "Determination of thermal conductivity and thermal diffusion coefficient of plastics - Part 3.Temperature wave analysis method".
Compared with ISO 22007-3.2008, this document has made the following structural adjustments.
---Chapter 5 corresponds to 5.1~5.3 in ISO 22007-3.2008;
---6.8 corresponds to 7.3 in ISO 22007-3.2008;
---8.3~8.9 corresponds to 8.4~8.10 in ISO 22007-3.2008;
---Appendix B corresponds to Appendix D in ISO 22007-3.2008, and Appendix D corresponds to Appendix B in ISO 22007-3.2008.
The technical differences between this document and ISO 22007-3.2008 and their reasons are as follows.
---Replaced ISO 472 (see Chapter 3) with normatively quoted GB/T 2035 to adapt to my country's technical conditions and increase operability
work nature;
---Replaced ISO 22007-1 (see Chapter 3) with normatively cited GB/T 42919.1 to adapt to my country's technical conditions, adding
Increase operability;
---Added the requirement that the temperature measuring device has an accuracy of at least ±0.3K (see 6.7);
---Deleted liquid samples (see 7.1 and 8.3 of ISO 22007-3.2008) because it is impossible to verify whether this document is applicable to liquids
specimen;
---Added the requirement to conduct a parallel test (see 8.10);
--- Added the requirement that the test result be the average of two repeated test results (see 9.6) to clarify the calculation method of the test results;
---Replaced ISO /IEC Guide98-3 (see 11.1) with normatively quoted GB/T 27418 to adapt to my country's technical requirements
parts to increase operability;
---The repeatability data has been changed from 1% to 5% (see 11.2), based on the test results measured by our country's laboratory to adapt to our country's
technical conditions.
Please note that some content in this document may be subject to patents. The publisher of this document assumes no responsibility for identifying patents.
This document is proposed by China Petroleum and Chemical Industry Federation.
This document is under the jurisdiction of the National Plastics Standardization Technical Committee (SAC/TC15).
This document was drafted by. Jiangsu Yichang Technology Co., Ltd., Zhonglan Chenguang Chemical Co., Ltd., SAIC-GM-Wuling Automobile Co., Ltd.
Division, CGN Jun'er (Zhejiang) New Materials Co., Ltd., Xiamen Oushengsi Technology Co., Ltd., Weihai Lianqiao New Materials Technology Co., Ltd.,
Everest Power Machinery (Ningde) Co., Ltd., Qingdao Hairong Commercial Cold Chain Co., Ltd., Dongguan Shishixing New Materials Co., Ltd., China
Qingdao Dagang Customs and Jilin Provincial Product Quality Supervision and Inspection Institute of the People's Republic of China.
The main drafters of this document. Sun Yingchun, Xie Peng, Lan Xian, Zhou Huijun, Liu Jinhua, Jiang Peng, Tang Qicai, Ren Fei, Fang Peiji, Gao Jianguo,
Zhang Chuanzhou and Li Shangyu.
Introduction
The thermal conductivity properties of plastics are indispensable in the plastics industry and other fields. When plastics are used in various new applications, such as nano
Technology and biomedicine require simple, small-scale tests that can be performed quickly and accurately. Temperature wave analysis is a method of testing the thermal diffusion coefficient of thin specimens
This method is also suitable for small samples.
GB/T 42919 "Determination of Thermal Conductivity and Thermal Diffusion Coefficient of Plastics" is intended to consist of six parts.
---Part 1.General principles. The purpose is to establish common definitions and methods for measuring thermal conductivity and thermal diffusivity.
content.
---Part 2.Transient plane heat source (hot plate) method. The purpose is to determine the transient plane of the thermal conductivity and thermal diffusivity of plastics.
Heat source (hot plate) method establishes operable, traceable, and verifiable procedures.
---Part 3.Temperature wave analysis method. The purpose is to establish a temperature wave analysis method for measuring the thermal conductivity and thermal diffusion coefficient of plastics.
Actionable, traceable, and verifiable procedures.
---Part 4.Laser flash method. The purpose is to establish an operable method for the laser flash method to determine the thermal conductivity and thermal diffusion coefficient of plastics.
operational, traceable, and verifiable procedures.
---Part 5.Interlaboratory test results of polymethylmethacrylate samples. The purpose is to conduct polymethylpropylene testing through multiple laboratories.
The thermal conductivity and thermal diffusion coefficient of methyl olefinate are measured and test data are provided.
---Part 6.Comparative method based on temperature modulation technology. The purpose is to provide a method for determining the ratio of low thermal conductivity using temperature modulation techniques.
Compare laws and establish operable, traceable and verifiable procedures.
Determination of thermal conductivity and thermal diffusion coefficient of plastics
Part 3.Temperature wave analysis method
1 Scope
This document describes a method for determining the thermal diffusivity in the thickness direction of plastic films and sheets using temperature wave analysis.
This document applies to plastics with isotropic or anisotropic structures whose thermal diffusion coefficient α ranges from 1.0×10-8m2·s-1~1.0×
10-4m2·s-1.
The tests specified in this document can be carried out in air or other gases, such as inert gases; at atmospheric pressure or other low, high or true pressures.
It can be carried out under air; it can be carried out at different temperatures.
2 Normative reference documents
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations
For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to
this document.
GB/T 2035 Plastic terms and definitions (GB/T 2035-2008, ISO 472.1999, IDT)
GB/T 27418 Evaluation and expression of measurement uncertainty (GB/T 27418-2017, ISO /IEC Guide98-3.2008, MOD)
GB/T 42919.1 Determination of thermal conductivity and thermal diffusivity of plastics Part 1.General principles (GB/T 42919.1-2023,
ISO 22007-1.2017,MOD)
ISO 80000-5 Quantities and units Part 5.Thermodynamics (Quantitiesandunits-Part 5.Thermodynamics)
3 Terms and definitions
The following terms and definitions as defined in GB/T 2035, GB/T 42919.1 and ISO 80000-5 apply to this document.
3.1
temperature wavetemperaturewave
Temperature oscillations produced by modulated power heat sources.
3.2
phaseshiftphaseshift
Δθ
The phase difference of the surface temperature wave before and after the sample.
NOTE. Delay is defined as negative phase shift.
4 symbols
The following symbols apply to this document.
A. The slope of the graph of the relationship between the phase shift Δθ and the square root of the temperature wave angular frequency ω, in units of one-half power second (s1/2).
C. Heat capacity per unit volume, unit is Joule per cubic meter Kelvin [J/(m3·K)].
d. Sample thickness, unit is meter (m).
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