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
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
