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GB/T 15047-2025: Test method for stiffness properties in torsion of plastics
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 15047-2025	English	299	Add to Cart	3 days [Need to translate]	Test method for stiffness properties in torsion of plastics
GB/T 15047-1994	English	179	Add to Cart	2 days [Need to translate]	Test method for stiffness proporties in torsion of plastics

GB/T 15047-2025: Test method for stiffness properties in torsion of plastics

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ICS 83.080.01 CCSG32 National Standards of the People's Republic of China Replaces GB/T 15047-1994 Plastic Torsional Stiffness Test Method Published on 2025-10-31 Implemented on May 1, 2026 State Administration for Market Regulation The State Administration for Standardization issued a statement.

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 replaces GB/T 15047-1994 "Test Method for Torsional Stiffness of Plastics". Compared with GB/T 15047-1994, the only differences are in the structural design. Aside from integration and editorial changes, the main technical changes are as follows. a) The requirements for instruments and equipment have been changed (see 5.1–5.5, 5.1–5.10 of the.1994 edition); b) The sample preparation method and requirements have been changed (see 6.1,.1994 edition 6.1); c) An additional requirement has been added for the span-to-specimen width ratio (see 6.2); d) Added requirements for rounding off sample size measurement results (see 8.1); e) Increased requirements for the temperature stability of the medium used to regulate the sample (see 8.8); f) Added requirements for rounding measurement and calculation results (see 9.1); g) A method for calculating the temperature corresponding to a specific apparent stiffness modulus has been added (see 9.3). 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 by the China National Light Industry Council. This document is under the jurisdiction of the National Technical Committee on Standardization of Plastic Products (SAC/TC48). This document was drafted by. Suzhou Xince Standard Technology Service Co., Ltd., Light Industry Plastics Processing and Application Research Institute, Sichuan University, and Beijing... Kunshan University of Technology and Business, Kunshan ACAS Testing Technology Service Co., Ltd., and Kunshan Polymer Materials Quality and Standardization Association. The main drafters of this document are. Xie Xiao, Bai Yu, Xiang Jun, Xu Bo, Zhao Jianming, Zou Jianfeng, Wang Lei, Hu Jing, Zhang Liping, Li An, and Gu Fangyan. The release history of this document and the document it replaces is as follows. ---First published in.1994 as GB/T 15047-1994; ---This is the first revision. Plastic Torsional Stiffness Test Method

1 Scope

This document describes a test method for determining the torsional stiffness of a plastic material within a certain temperature range by measuring its apparent stiffness modulus. This document applies to the determination of torsional stiffness in thermoplastics.

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 2035 Plastics Terminology GB/T 2918 Standard Environment for Conditioning and Testing of Plastic Specimens

3 Terms and Definitions

The terms and definitions defined in GB/T 2035 and the following terms and definitions apply to this document. 3.1 When the specimen twists due to exceeding its elastic limit, and the influence of material creep characteristics is taken into account, the measured rigidity modulus will differ. The value of it within the elastic limit. 3.2 elasticlimit The maximum stress a material can withstand without undergoing permanent plastic deformation. 4.Principles At a set temperature, a torque is applied to the specimen for a specified time, and the apparent rigidity modulus is calculated by measuring the torsion angle. 5.Instruments and Equipment 5.1 Torsion Testing Machine The torsion testing machine should be able to apply a controllable torque to cause the specimen to deflect within the range of 5° to 100°. The specific deflection angle depends on the specimen. Stiffness characteristics, thickness, and span. A typical schematic diagram of a torsion testing machine is shown in Figure 1.The torsion testing machine should be able to withstand torsion of 0.0113 N·m. Torque can be applied and measured within the range of 1.81 N·m, which can be achieved by a single torsion testing machine or by a combination of two devices with different ranges. (e.g., torsion testing machine A. 0.0113 N·m ~ 0.113 N·m, torsion testing machine B. 0.113 N·m ~ 1.81 N·m), and equipped with more... The standard counterweight is changed to allow for precise torque adjustment based on the specimen stiffness, ensuring effective testing within the target deflection angle range. The torsion testing machine should... ...