GB/T 46200-2025Determination of coefficient of linear thermal expansion of fibre reinforced polymer matrix composites at ultra-low temperature (English PDF)
纤维增强聚合物基复合材料超低温线膨胀系数的测定
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
August 29, 2025
Implementation date
March 1, 2026
Scope
GB/T 46200-2025 is the English-translated version of 纤维增强聚合物基复合材料超低温线膨胀系数的测定.
GB/T 46200-2025 is the Chinese national method for measuring the linear expansion coefficient of fibre reinforced polymer matrix composites at ultra-low temperature.
Low temperature strain gauges are bonded to the specimen and to a reference specimen and connected as a Wheatstone half bridge; the temperature and the strain of both are followed while the temperature changes at a controlled rate, and the coefficient comes from the ratio of the strain change to the temperature change.
The document describes the test principle, the cooling equipment, including the cryostat built from a multi-layer insulated dewar, the specimens, the test procedure, the calculation of results and the test report.
It applies between -269 °C and -180 °C and serves as a reference for polymer matrix materials. It was issued on 29 August 2025 and has applied since 1 March 2026.
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Document preview — GB/T 46200-2025
National Standard of the People's Republic of China
- ICS
- 83.120
- Classification
- Q 23
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Test Principle
- 5 Test equipment
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 for standardization documents" Drafting.
1 Scope
This document describes the test principle, test apparatus, specimens, and test methods for determining the ultra-low temperature linear expansion coefficient of fiber-reinforced polymer matrix composites, the test steps, the result calculation and presentation, and the test report.
This document is applicable to the measurement of the linear expansion coefficient of fiber reinforced polymer composites using low temperature strain gauges in the temperature range of -269°C~-180°C. It is used as a reference for the determination of the linear expansion coefficient of polymer matrix materials.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.
GB/T 1446 General principles for test methods for properties of fiber reinforced plastics
GB/T 2572 Test method for average linear expansion coefficient of fiber reinforced plastics
GB/T 13992 Metal-bonded resistance strain gauge
3 Terms and Definitions
The terms and definitions defined in GB/T 2572 and GB/T 13992 and the following apply to this document.
3.1 Dewar
A vacuum insulated container that holds the cooling medium.
4 Test Principle
The low temperature strain gauges are respectively pasted on the surface of the sample and the reference sample, and connected with the strain gauge to form a Wheatstone half-bridge circuit.
Under the temperature rate, the temperature and the strain change of the sample and the reference sample are measured, and the ratio of the strain change to the temperature change is calculated to obtain the sample Ultra-low temperature linear expansion coefficient.
5 Test equipment
5.1 Cooling device
5.1.1 Basic requirements
The cooling device should be able to cool the specimen and reference specimen to the specified test temperature through a cooling medium (such as liquid helium) or a refrigerator.
5.1.2 Cryostat
5.1.2.1 The cryostat consists of a dewar with a multi-layer insulation structure and a test frame with a supporting platform structure.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
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Related Standards
GB/T 13992-2010 — Metallic bonded resistance strain gauges
GB/T 1446-2005 — Fiber-reinforced plastics composites-The generals for determination of properties
GB/T 14460-2015 — Polyester drawn textured yarn
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