GB/T 2951.41-2008Common test methods for insulating and sheathing materials of electric and optical cables -- Part 41: Methods specific to polyethylene and polypropylene compounds -- Resistance to environmental stress cracking -- Measurement of the melt flow index -- Carb (English PDF)

Foreword

GB/T 2951 "cable and the cable Common test methods for insulating and sheathing materials" is divided into 10 parts.

--- Part 11. General test methods for measuring the thickness and overall dimensions --- --- mechanical tests;

--- Part 12. Common test methods --- Thermal aging methods;

--- Part 13. General test method for determining the density method --- --- --- Water absorption tests - Shrinkage test;

--- Part 14. Common test methods --- low temperature test;

--- Part 21. elastomeric compounds specific test method Ozone resistance --- --- --- Hot set test - Mineral oil immersion test;

--- Part 31. Methods specific to PVC compounds - Pressure test --- --- high temperature resistance to cracking;

--- Part 32. Methods specific to PVC compounds - Loss of mass test --- --- thermal stability test;

--- Part 41. polyethylene and polypropylene compounds - Test methods --- --- ESCR test melt index measurement Measurement Method --- direct combustion of polyethylene in carbon black and/or mineral filler content --- thermal gravimetric analysis (TGA) measurements of carbon Black --- microscopy to assess the content of carbon black dispersion in polyethylene;

This part of the standard replaces the previous editions are.

--- GB/T 2951.8-1997;

--- GB 2951.36-1983, GB/T 2951.36-1994, GB/T 2951.39-1994, GB/T 2951.41-1994, GB/T 2951.42-1994.

GB/T 2951.41-2008/IEC 60811-4-1:2004 Common test methods for cables and cable insulation and sheathing materials Part 41. polyethylene and polypropylene compounds - Test methods

--- Resistance to environmental stress cracking test --- melt index Direct measurement method --- Measurement of combustion carbon black polyethylene and (or) mineral filler content --- thermal gravimetric analysis (TGA) Measurement of carbon black content --- microscopy assessment polyethylene Carbon black dispersion

1 Overview

2 Terms and definitions

For ease of testing, we should distinguish between low-density, medium density and high density polyethylene.

23 °C Density Polyethylene Type a/(g/cm3) LDPE <=0.925 Medium density polyethylene > 0.925, <=0.940 High density polyethylene > 0.940 a density means these unfilled resin. Determination according to GB/T 2951.13-2008 provisions of Chapter 8.

3 Test principle

This section does not provide all of the test conditions (such as temperature, duration, etc.) as well as all of the test requirements, they should be on cable Product standards to be defined.

All test requirements specified in this part of the cable can be modified in the relevant product standard in order to meet the needs of a particular type of cable.

4 Scope

Test conditions and test parameters specified in this section apply to the cable, the most common type of cable, wires and cords insulation and sheathing materials.

GB/T 2951.41-2008/IEC 60811-4-1:2004