The flame-retardant polyvinyl chloride insulation layer material for wires and cables is a granular cable material made by mixing, plasticizing, and granulating polyvinyl chloride resin as the base material, adding plasticizers, stabilizers, flame retardants, and other additives.
Model, brand and various names, execution standards, purposes and specifications

Model	Maximum operating temperature of wire core (℃)	Name	Execution standards	Usage and Cable Material Specification
ZJ-70	70	70 ℃ PVC flame retardant soft insulation layer plastic	GB/T8815-2008	Core working temperature 70 ℃ Flame retardant PVC flexible wire and cable insulation layer plastic
ZJR-70	70	70 ℃ PVC flame retardant soft insulation layer plastic	GB/T8815-2008	Core working temperature 70 ℃ Flame retardant PVC flexible wire and cable insulation layer plastic
ZJ-90	90	90 ℃ PVC flame retardant soft insulation layer plastic	GB/T8815-2008	The insulation layer plastic of flame-retardant PVC power cables with a core working temperature of 90 ℃

Note: The relative density index and color are determined through negotiation between the supply and demand parties.

Mechanical and electrical properties

Experimental project		Company	Standard value
			ZJ-70	ZJR-70	ZJ-90
Tensile strength		≥ MPa	15.0	15.0	16.0
Fracture tensile strain		≥ %	150	180	150
Brittle temperature		≤ ℃	-15	-20	-15
Volume resistivity at 20 ℃		≥ Ω•m	1.0×10¹²	1.0×10¹¹	1.0×10¹²
At working temperature Volume resistivity	Test temperature	℃	70±1	70±1	95±1
	Volume resistivity	≥ Ω•m	1.0×10⁹	1.0×10⁸	5.0×10⁸
Dielectric strength		≥ MV/m	20	20	20
Thermal deformation		≤ %	40	50	30
200 ℃ thermal stability time		≥ min	60	60	80
Oxygen index		%	26-30	26-30	26-30
Thermal aging performance
Thermal aging temperature		℃	100±2	100±2	135±2	115±2
Thermal aging time		h	168	168	240	240
Tensile strength after aging Maximum rate of change in tensile strength		≥ MPa	15.0	12.5	16.0
		≤ %	±20	±20	±20
Fracture tensile strain after aging Maximum change rate of fracture tensile strain		≥ %	150	180	150
		≤ %	±20	±20	±20
Mass loss		≤g/m²	20	20		20

Processing technology
Using a general extruder for processing, with L/D ≥ 20, it is recommended to set the temperature at each point of the extruder as follows:

District Point	Zone 1	Zone 2	Zone 3	Zone 4	Zone 5	Die head
Temperature ℃	140	160	170	175	180	175

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