GB/T 2951.9-1997 Common test methods for insulating and sheathing materials of electric cables. Part 4: Methods specific to polyethylene and polypropylene compounds. Section two: Elongation at break after pre-conditioning--Wrapping test after pre-conditioning--Wrapping was changed to GB/T 2951.42-2008 Common test methods for insulating and sheathing materials of electric and optical cables.Part 42:Methods specific to polyethylene and polypropylene compounds.Tensile strength and elongation at break after conditioning at elevated temperature.Wrapping tes.
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