The PVC insulation layer material for wires and cables is a granular cable material made by mixing, plasticizing, and granulating PVC resin as the base material, adding plasticizers, stabilizers, 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
J-70	70	70 ℃ PV soft insulation layer plastic	GB/T8815-2008	Insulation layer of instrument communication cables, cables with 0.6/1KV and below
JR-70	70	70 ℃ PV soft insulation layer plastic	GB/T8815-2008	Insulation layer for flexible wires and cables of 450/750V and below
JGD-70	70	70 ℃ PV soft insulation layer plastic	GB/T8815-2008	Insulation layer of 3.5/6KV and below power cables
J-90	90	90 ℃ PV soft insulation layer plastic	GB/T8815-2008	Insulation layer for heat-resistant wires and cables of 450/750V and below

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
Experimental project		Company	J-70	JR-70	JGD-70	J-90
Tensile strength		≥ MPa	15.0	15.0	16.0	16.0
Fracture tensile strain		≥ %	150	180	150	150
Brittle temperature		≤ ℃	-15	-20	-15	-15
Volume resistivity at 20 ℃		≥ Ω•m	1.0×10¹²	1.0×10¹¹	3.0×10¹²	1.0×10¹²
At working temperature Volume resistivity	Test temperature	℃	70±1	70±1	70±1	95±1
At working temperature Volume resistivity	Volume resistivity	≥ Ω•m	1.0×10⁹	1.0×10⁸	5.0×10⁹	5.0×10⁸
Dielectric strength		≥ MV/m	20	20	20	20
200 ℃ thermal stability time		≥ min	60	60	100	180
Thermal aging performance
Thermal aging temperature		℃	100±2	100±2	100±2	135±2	115±2
Thermal aging time		h	168	168	168	240	240
Tensile strength after aging Maximum rate of change in tensile strength		≥ MPa	15.0	15.0	16.0	16.0
		≤ %	±20	±20	±20	±20
Fracture tensile strain after aging Maximum change rate of fracture tensile strain		≥ %	150	180	150	150
		≤ %	±20	±20	±20	±20
Mass loss		≤g/m²	20	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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