GB/T 36800.2-2018Plastics -- Thermomechanical analysis (TMA) -- Part 2: Determination of coefficient of linear thermal expansion and glass transition temperature (English PDF)
塑料 热机械分析法(TMA) 第2部分：线性热膨胀系数和玻璃化转变温度的测定
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Issued by
State Administration for Market Regulation, China National Standardization Administration
Level / Type
National · Recommended
Issue date
September 17, 2018
Implementation date
April 1, 2019
Scope
GB/T 36800.2-2018 is the English-translated version of 塑料 热机械分析法(TMA) 第2部分：线性热膨胀系数和玻璃化转变温度的测定.
GB/T 36800.2-2018 is the Chinese standard "Plastics -- Thermomechanical analysis (TMA) -- Part 2: Determination of coefficient of linear thermal expansion and glass transition temperature".
Its scope clause reads: This part of GB/T 36800 specifies the use of thermal expansion principle, the use of thermomechanical analysis (TMA) to determine the state of plastic solid state line Method of thermal expansion coefficient.
A method for determining the glass transition temperature by thermomechanical analysis is also specified. Note. Various types of thermal expansion instruments can be used to measure the linear thermal expansion coefficient.
This section only covers TMA instruments. Its clauses include terms and definitions.
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Document preview — GB/T 36800.2-2018
National Standard of the People's Republic of China
- ICS
- 83.080.20
- Classification
- G 31
Issued by: State Administration for Market Regulation, China National Standardization Administration
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
1 Scope
This part of GB/T 36800 specifies the use of thermal expansion principle, the use of thermomechanical analysis (TMA) to determine the state of plastic solid state line
Method of thermal expansion coefficient. A method for determining the glass transition temperature by thermomechanical analysis is also specified.
Note. Various types of thermal expansion instruments can be used to measure the linear thermal expansion coefficient. This section only covers TMA instruments.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
Standard environment for conditioning and testing of ISO 291 plastic specimens (Plastics-Standardatmospheresforcondition
Andtesting)
ISO 11359-1 Plastics Thermomechanical Analysis (TMA) Part 1. General Rules [Plastics-Thermomechanical
Analysis(TMA)-Part 1.Generalprinciples]
3 Terms and definitions
The following terms and definitions as defined by ISO 11359-1 apply to this document.
3.1 Thermal expansion
The change in sample size at the time of temperature change was measured by a thermal expansion method.
3.2 Linear thermal expansion coefficient
The length of material per unit length varies reversibly for every 1 °C change in temperature.
Note. Two different linear thermal expansion coefficients can be determined. differential linear thermal expansion coefficient and average linear thermal expansion coefficient.
3.2.1 Differential linear thermal expansion coefficient
Calculate the expansion coefficient in either direction in three directions at temperature (T) and constant pressure (p). The equation is as follows.
alpha= dL( ) p dT( ) p
L0= dL/dt( ) p dT/dt( ) p
L0 (1)
In the formula.
L0 --- the initial length of the sample in the measurement direction at room temperature;
L --- the length of the sample in the measurement direction at temperature T;
dL---the change in length during the test time interval dt under a constant pressure p;
dT---the change in temperature during the test time interval dt under a constant pressure p.
GB/T 36805.2 | GB/T 37638 | GB/T 36374.1 | GB/T 36800.3 | GB/T 36790 | GB/T 36800.1 | […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 24 pages — is available in the English PDF.
Referenced standards
Normative references
ISO 291 · ISO 11359
Cited by
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- GB/T 46830.2-2026Plastics - Liquid crystal polymer (LCP) moulding and extrusion materials - Part 2: Preparation of test specimens and determination of properties
- GB/T 28859-2025Epoxy powder encapsulation material for electronic packaging
- GB/T 45694-2025Test methods for natural fibre-reinforced plastic composite (NFC) deck boards
- GB/T 29165.2-2022Petroleum and natural gas industries - Glass-reinforced plastics (GRP) piping - Part 2: Qualification and manufacture
- GB/T 41758.2-2022Plastics - Polyketone (PK) moulding and extrusion materials - Part 2: Preparation of test specimens and determination of properties
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