EPDM insulation compound
This products implements performance requirements for EPDM insulated rubber of national standard GB/T 7594-87 and is suitable for insulating layers of common rubber sheathed cable, mining cable, UCPJB, UCPJR, wind power cable, and etc. Its mechanical, physical and electrical properties are as follows:
Indicator requirements and measured performance

Test item	Unit	HJ-1		HJ-2			HJ-3
		Standard requirements	Typical values	Standard requirements	Standard requirements		Typical values	Standard requirements
Initial tensile strength	Mpa	≥5.0	6.5	≥5.0	7.5		≥4.2	8.0
Elongation at break	%	≥250	280	≥250	290		≥200	240
Thermal aging of air box	Conditions	75±2℃×240h		80±2℃×240h			135±2℃×168h
Tensile strength change rate	%	±30	+8	±30	+9.0		±30	+10.0
Change rate of elongation at break	%	±30	-8	±30	-10.0		±30	-15.7
Thermal extension test	Conditions	200±2℃× 15 min×0.2MPa				250±3℃× 15 min×0.2MPa min×0.2MPa min×0.2MPa
Elongation under load	%	≤175	75	≤175	68		≤175	68
Permanent deformation after cooling	%	≤25	18	≤20	15		≤15	11
Volume resistivity at 20℃	Ω﹒m	≥1.0×1013	5.5×1013	≥1.0×1014	7.2×1014		≥1.0×1015	6.7×1015
Dielectric strength	MV/m		26		28			28
Ozone resistance	Conditions	250±2℃× 24h ×0.025~0.03%
	Results						No cracks	No cracks