Standard No.:	GB/T 2951.41-2008
English Name:	Common test methods for insulating and sheathing materials of electric and optical cables - Part 41: Methods specific to polyethylene and polypropylene compounds - Resistance to envi
Chinese Name:	电缆和光缆绝缘和护套材料通用试验方法 第41部分：聚乙烯和聚丙烯混合料专用试验方法 耐环境应力开裂试验 熔体指数测量方法 直接燃烧法测量聚乙烯中碳黑和(或)矿物质填料含量 热重分析法(TGA)测量碳黑
Chinese Classification:	K13    Cable and its accessory
Professional Classification:	GB    National Standard
Issued by:	AQSIQ; SAC
Issued on:	2008-6-26
Implemented on:	2009-4-1
Status:	valid
Superseding:	GB/T 2951.8-1997 GB/T2951.8-1997 Common test methods for insulating and sheathing materials of electric cables-Part 4: Methods specific to polyethylene and polypropylene compounds-Section one:Resistance to environmental stress cracking-Wrapping test after thermal ageing ageing in
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1 General 1.1 Scope This part of GB/T 2951 specifies the test methods to be used for testing polymeric insulating and sheathing materials of electric and optical fibre cables for power distribution and telecommunications, including cables used on ships and in offshore applications. These test methods apply specifically to PE and PP compounds, including cellular compounds and foam skin for insulation. 1.2 Normative References The following normative document contains provisions which, through reference in this text, constitute provisions of this part of GB/T 2951. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies. GB/T 2951.13-2008 Common Test Methods for Insulating and Sheathing Materials of Electric Cables and Optical Cables — Part 13: Measurement for Determining the Density — Water Absorption Tests — Shrinkage Test (IEC 60811-1-3:1993, IDT) ISO 18553:2002 Method for the Assessment of the Degree of Pigment or Carbon Black Dispersion in Polyolefin Pipes, Fittings and Compounds 2 Terms and Definitions For the purposes of this document, a distinction is made between low-density, medium-density and high-density PE as shown below:

Foreword III 1 General 1.1 Scope 1.2 Normative References 2 Terms and Definitions 3 Test Values 4 Applicability 5 Type Tests and Other Tests 6 Pre-conditioning 7 Median Value 8 Resistance to Environmental Stress Cracking 8.1 General 8.2 Apparatus 8.3 Preparation of the Test Sheets 8.4 Conditioning of the Test Sheets 8.5 Visual Examination of the Test Sheets 8.6 Test Procedure 8.7 Evaluation of Results 8.8 Summary of Test Conditions and Requirements for Procedures A and B 9 Wrapping Test After Thermal Ageing in Air 10 Measurement of the Melt Flow Index 10.1 General 10.2 Apparatus 10.3 Test Samples 10.4 Cleaning and Maintenance of the Apparatus 10.5 Method A 10.6 Method C 11 Carbon Black and/or Mineral Filler Content Measurement in Polyethylene — Direct Combustion Method 11.1 Sampling 11.2 Test Procedure 11.3 Expression of Results 12 Thermogravimetric Analysis of the Carbon Black Content in Polyolefine Compounds 12.1 Principle 12.2 Reagents 12.3 Apparatus 12.4 Procedure 13 Test for the Assessment of Carbon Black Dispersion in Polyethylene 13.1 General 13.2 Procedure 13.3 Expression of Results 13.4 Requirements Annex A (Informative) Tools and Reagents