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GB/T 42918.2-2023: Plastics - Thermoplastic polyurethanes for moulding and extrusion - Part 2: Preparation of test specimens and determination of properties
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GB/T 42918.2-2023: Plastics - Thermoplastic polyurethanes for moulding and extrusion - Part 2: Preparation of test specimens and determination of properties

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ICS 83:080:20 CCSG31 National Standards of People's Republic of China Thermoplastic polyurethanes for plastic molding and extrusion Part 2: Sample preparation and performance determination (ISO 16365-2:2014,MOD) Published on 2023-11-27 2024-06-01 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 2 of GB/T 42918 "Thermoplastic polyurethanes for plastic molding and extrusion": GB/T 42918 has been released The following sections are included: ---Part 1: Nomenclature system and classification basis; ---Part 2: Sample preparation and performance determination: This document is modified from ISO 16365-2:2014 "Thermoplastic polyurethanes for plastic molding and extrusion - Part 2: Specimen preparation and properties" Can be measured": A "Terms and Definitions" chapter has been added to this document: Compared with ISO 16356-2:2014, there are many technical differences between this document and the clauses involved in the outer page blanks: Straight single lines (|) are marked: A list of these technical differences and their causes is provided in Appendix A: The following editorial changes have been made to this document: ---Replace ISO 10350-1 with the informative reference GB/T 19467:1 (see Chapter 1 and 6:1); ---Replace ISO 16365:1 with the informative reference GB/T 42918:1 (see Chapter 1); ---Deleted the note in Chapter 1; --- Added notes on injection molding sample preparation conditions (see 4:2); --- Added Note 2 in sample adjustment (see Chapter 5); ---Added Appendix A (informative) "Technical differences between this document and ISO 16365-2:2014 and their reasons"; ---Added Appendix D (informative) "Result expression and precision in thermoplastic polyurethane performance measurement methods"; ---Deleted Appendix A (Informative) "Material Identification" in ISO 16356-2:2014: 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: Zhejiang Huafeng Thermoplastic Polyurethane Co:, Ltd:, Meirui New Materials Co:, Ltd:, Wanhua Chemical Group Co:, Ltd: Co:, Ltd:, Zhejiang Hexin Technology Co:, Ltd:, Asahikawa Chemical (Suzhou) Co:, Ltd:, Shandong Kelimei Industrial Co:, Ltd:, Shanghai Fujia Fine Chemical Co:, Ltd:, Shandong Yinuowei Polyurethane Co:, Ltd:, Zhejiang Yidan New Material Technology Co:, Ltd:, Nantong Deyi New Material Co:, Ltd:, Ningbo Jutai New Material Technology Co:, Ltd:, Ningbo Jinsui Rubber and Plastic Co:, Ltd:, Zhejiang Sipu Intelligent Technology Co:, Ltd:, Linyi Sk Rui Polyurethane Materials Co:, Ltd:, Cangzhou Dahua Co:, Ltd:, Zhejiang Pinyao Technology Co:, Ltd:, and Liming Chemical Research and Design Institute have Limited Liability Company: The main drafters of this document: Jin Meijin, He Weina, Song Hongwei, Yang Li, Ji Shangchao, Zhang Dahua, Xue Dong, Shi Dandan, Yang Youli, Chen Hailiang, Nan Jianju, Chen Qiaojian, Ying Jianbo, Huang Congjie, Wang Liucun, Zhang Hanling, Zhao Zhifeng, Huang Yi, Liu Jianwen, Li Na, Wang Zhishuan, Chen Peipei, Xu Xinxin, Zou Zongjun, Xie Weiwei:

Introduction

GB/T 42918 "Thermoplastic Polyurethane for Plastic Molding and Extrusion" is a specification for thermoplastic polyurethane products for molding and extrusion: The basic standards for inspection are planned to consist of three parts: ---Part 1: Nomenclature system and classification basics: The purpose is to establish a nomenclature system for thermoplastic polyurethanes used in molding and extrusion, giving Nomenclature table for thermoplastic polyurethane: ---Part 2: Sample preparation and performance determination: The purpose is to describe methods for the preparation and property determination of thermoplastic polyurethane specimens: ---Part 3: Distinguish between ether-based polyurethane and ester-based polyurethane using the ester group content determination method: The purpose is to describe the use of ester group content determination How to distinguish between ether-based polyurethane and ester-based polyurethane: Thermoplastic polyurethanes for plastic molding and extrusion Part 2: Sample preparation and performance determination

1 Scope

This document describes specimen preparation and determination methods for performance testing of thermoplastic polyurethanes for molding and extrusion: It also specifies processing Requirements for test materials and requirements for conditioning the test material before molding and the condition of the sample before testing: This document gives the steps and conditions for preparing test samples under specified conditions, as well as the steps for testing the material properties of these samples: A list is given of properties suitable and used for characterizing thermoplastic polyester/polyurethane and polyether/polyurethane (TPU) materials for molding and extrusion: Energy and its measurement method, the performance is selected from the general measurement methods of GB/T 19467:1: This document also includes other testing methods that are widely used or have special significance for materials used in molding and extrusion, such as in GB/T 42918:1 Specified performance specified in : In order to obtain reproducible and comparable test results, the sample preparation and condition adjustment methods and sample rulers specified in this document need to be used: dimensions and test steps: The test data obtained from samples of different sizes or prepared by different steps and conditions are not necessarily exactly the same:

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 528 Determination of tensile stress and strain properties of vulcanized rubber or thermoplastic rubber (GB/T 528-2009, ISO 37: 2005,IDT) GB/T 529-2008 Determination of tear strength of vulcanized rubber or thermoplastic rubber (trouser-shaped, right-angled and crescent-shaped specimens) (ISO 34- 1:2004,MOD) GB/T 1033:1-2008 Determination of density of plastic non-foam plastics Part 1: Dip method, liquid pycnometer method and titration method (ISO 1183-1:2004,IDT) GB/T 1040:2 Determination of tensile properties of plastics Part 2: Test conditions for molded and extruded plastics (GB/T 1040:2- 2022,ISO 527-2:2012,MOD) GB/T 1043 (all parts) Determination of impact properties of plastic simply supported beams [ISO 179 (all parts)] Note: GB/T 1043:1-2008 Determination of impact properties of plastic simply supported beams Part 1: Non-instrumented impact test (ISO 179-1:2000, IDT) GB/T 1043:2-2018 Determination of impact properties of plastic simply supported beams Part 2: Instrumented impact test (ISO 179-2:1997, IDT) GB/T 1408:1 Test methods for electrical strength of insulating materials Part 1: Test at power frequency (GB/T 1408:1-2016, IEC 60243-1:2013,IDT) GB/T 2408 Horizontal and vertical methods for determination of combustion properties of plastics (GB/T 2408-2021, IEC 60695-11-10: 2013,MOD) GB/T 2410 Determination of transmittance and haze of transparent plastics GB/T 2411 Determination of indentation hardness (Shore hardness) of plastics and hard rubber using a durometer (GB/T 2411-2008, ISO 868: 2003,IDT) GB/T 3682:2 Determination of melt mass flow rate (MFR) and melt volume flow rate (MVR) of plastic thermoplastics ...