Properties of halogen-free low smoke flame retardant thermoplastic polyolefin insulating materials and sheathing materials.

	Inspection item	Unit	Requirements
			WDZ-Y-J70	WDZ-Y-H70	WDZ-Y-H90
1	Tensile strength	MPa	≥10. 0	≥10. 0	≥10. 0
2	Elongation at break	%	≥160	≥160	≥160
3	Air aging chamber
	Aging temperature	℃	100±2	100±2	110±2
	Aging time	h	168	168	240
	Maximum rate of change of tensile strength	%	±25	±25	±25
	Maximum rate of change of elongation at break	%	±25	±25	±25
4	Thermal deformation
	Test temperature	℃	90±2	90±2	90±2
	Experimental result	%	≤50	≤50	≤50
5	20℃ volume resistivity	Ω · m	≥1. 0×1012	≥1. 0×1010	≥1. 0×1010
6	Volume resistivity at operating temperature
	Test temperature	℃	70±1	—	—
	Volume resistivity	Ω · m	≥2. 0×108	—	—
7	Dielectric strength	MV/m	≥20	≥18	≥18
8	Heat shock test
	Test temperature	℃	130±3	130±3	130±3
	Test time	%	1	1	1
	Experimental result	—	No cracking	No cracking	No cracking
9	Impact embrittlement temperature
	Test temperature	℃	-25	-25	-25
	Experimental result	Number	≤15/30	≤15/30	≤15/30
10	Ozone resistance test
	Test temperature	℃	—	25±2	25±2
	Experiment time	h	—	24	24
	Ozone concentration	ppm	—	250~300	250~300
	Experimental result	—	—	No cracking	No cracking
11	Hot water immersion test
	Test temperature	℃	—	70±2	70±2
	Experiment time	h	—	168	168
	Maximum rate of change of tensile strength	%	—	±30	±30
	Maximum rate of change of elongation at break	%	—	±35	±35
12	Oxygen index	%	≥28	≥30	≥30
13	Smoke density
	flameless	—	≤350	≤350	≤350
	flaming	—	≤100	≤100	≤100
14	Combustion releases gas acidity
	HCI and HBr content	%	≤0.5	≤0.5	≤0.5
	HF content	%	≤0.1	≤0.1	≤0.1
	pH value	—	≥4.3	≥4.3	≥4.3
	Electric conductivity	μS/mm	≤10	≤10	≤10
15	Material smoke toxicity hazards	According to the application requirements of the product, negotiated by the supply and demand parties.