Flame retardant polyvinyl chloride protective 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
ZH-70	70	70 ℃ PVC flame retardant soft protective layer plastic	GB/T8815-2008	Core working temperature 70 ℃ Flame retardant PVC flexible wire and cable protective layer plastic
ZHR-70	70	70 ℃ PVC flame retardant soft protective layer plastic	GB/T8815-2008	Core working temperature 70 ℃ Flame retardant PVC flexible wire and cable protective layer plastic
ZH-90	90	90 ℃ PVC flame retardant soft protective layer plastic	GB/T8815-2008	The working temperature of the wire core is 90 ℃, and the protective layer plastic of flame-retardant PVC power cables

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	ZH-70	ZHR-70	ZH-90
Tensile strength	≥ MPa	15.0	12.5	16.0
Fracture tensile strain	≥ %	180	200	180
Brittle temperature	≤ ℃	-25	-30	-20
Volume resistivity at 20 ℃	≥ Ω•m	1.0×10⁸	1.0×10⁸	1.0×10⁹
Dielectric strength	≥ MV/m	18	18	18
Thermal deformation	≤ %	50	65	40
200 ℃ thermal stability time	≥ min	50	60	80
Oxygen index	≥ %	26-30	26-30	26-30
Thermal aging performance
Thermal aging temperature	℃	100±2	100±2	100±2
Thermal aging time	h	168	168	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	≥ %	180	200	180
	≤ %	±20	±20	±20
Mass loss	≤g/m²	23	25	15

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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