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PVC plastic classification of wire and cable

Information Source:Henan Huadong Cable Co., Ltd Release date:2014-02-09

PVC is a multicomponent plastics, according to the use of different varieties and amount of change, complexing agent, can be prepared in different varieties of wire and cable with PVC plastics.

PVC cable plastic according to their use in wire and cable is different, can be divided into insulation cable and cable support level.

1 The insulation PVC plastics

According to the requirements and characteristics of wire and cable, insulation PVC plastic types, properties, and uses as shown in the following table.

Insulated with PVC plastic classification and performance

Type
Performance requirements
The use of temperature
Application
The insulation stage
Electrical insulating performance, heat resistance, certain softness
70oC
Communication, control, signal and low voltage power cable insulation
A common insulation stage With an electrical insulating performance, good flexibility and low air resistance
70oC
Wire insulation installation of indoor fixed laying wires sheathed flexible cord, cable, 500V farm and instrument
Heat insulation stage Have better heat aging resistance and deformation resistance, electrical insulating performance is better
80oC
105oC
Requirements for aviation cable, wire, power cables and installation wire insulating heat-resistant high ship
High electrical insulation stage Electrical insulation good performance, high insulation resistance, good dielectric properties, good heat tolerance
70oC
Insulation voltage of power cable 6kV 10kV grade
Oil and solvent resistance of insulation level With good oil resistance, solvent resistance and softness, good electrical insulation properties
70oC
For insulated cables contact with oil and chemicals
Flame retardant insulation stage Electric insulation performance is good, have a higher resistance to flame combustion, better flexibility
70oC
Wire insulated power cable, mining cable, fixed installation

All kinds of PVC insulated material technical requirements are shown in the following table.

Insulated with PVC plastic technical requirements

Technical indicators The insulation level
A common insulation stage
Heat insulation stage
High electrical insulation stage
80oC
105oC
Volume
resistivity
(Ω·cm)
20oC
1×1014
1×1014
3×1014
3×1014
5×1014
70oC
1×1011
1×1010
5×1011
80oC
5×1011
105oC
 
2×1011
The breakdown field strength(kV/mm) ≥
20
20
20
20
20
Dielectric loss tangen ttgδ(20~85oC)≤
0.1
Dielectric loss factor ε,
≤tgδ(20~85oC)
 
 
 
 
0.75
Tensile strength(N/mm2)≥
180
170
200
200
200
Elongation at break(%)≥
200
220
180
200
160
Low temperature impact Compression temperature(oC)≤
0
-10
+3
+5
200 oCThermal stability time(min)≥
60
60
60
60
60
Softening temperature (oC)
170~190
170~190
180~195
175~185
Thermal
aging
properties
The aging temperature(oC)
110
110
113
136
110
Aging time(h)
48
48
168
168
48
K1(%)≥
80
K2(%)≥
70
75
80
70
70
Weight loss (%)≤
6.0
7.0
5.0
2.5
6.0

2 PVC for sheath

Polyvinyl chloride plastic coating has good corrosion resistance, mechanical properties of enough, some atmospheric resistance, soft, resistant to vibration, light weight, convenient processing and installation. According to the conditions of use of wire and cable, which have different types of PVC, its performance and application scope of the table below.

With the classification and properties of PVC plastics

TYpe
Performance requirements
Using temperature
Application
The general support level
Sufficient mechanical strength, heat resistance, light aging resistance and cold tolerance
70 oC
Plastic cable outer sheath and other cable outer sheath
Cold resistant protective layer
A cold high, low temperature flexibility
70 oC
Outdoor and cold electricity cable sheath
Soft protective layer
A higher flexibility, cold resistant
70 oC
Hardy cable soft protective layer
Heat resistant protective layer
Good heat resistance
80 oC
105 oC
Wire and cable thermal protection layer
Oil resistant protective layer
The oil resistance, chemical resistance and good
70 oC
The wire cable protective layer in contact with oil and chemicals
Tear off protective layer
Tear resistance is low, easy installation, low price
70 oC
Fixed indoor laying with insulated wire sheath
Antifungal, anti termite,
Rat proof protective layer
Anti biotic, anti termite, anti mildew
70 oC
Tropical and temperate and tropical regions with cable sheath
Flame retardant protective layer
Fire resistance
70 oC
The wire cable protective layer with high safety requirements

3 The semi conductive polyvinyl chloride plastics

Semi conductive polyvinyl chloride plastics can be used as shielding materials to use, for example, can be used as a shielding layer 10kV PVC cable. Shielding material of semi conductive plastics used in high voltage cables, the semi conducting materials in direct contact with the insulating material, will interact with the same migration, thus to the selection of insulating material of plasticizer or electrical good, small plasticizer migration. Otherwise the electrical insulation performance of insulating material in the use process.

4 environmental protection anti termite, rat proof cable sheath material

Termites and rats caused damage to the cable, light interruption of power supply, heavy then lead to accident, so that the power and communications departments damage. Previous by adding toxic additives in cable sheath material (such as chlordane, seven chlorine, dieldrin, aldrin etc.) way, kill termites, rats, in order to protect the safe operation of cables. But these toxic additives to the environment and human body will cause pollution and harm. At present, more use of adding lead naphthenate or naphthenic acid ketone in the sheath material as additive, anti termite sheath material modification.

5 low smoke and low halogen type flame retardant sheath material

With ordinary (flame retardant) cable, PVC cable material manufacturing combustion will produce a lot of smoke, and the release of large amounts of corrosive gases HCl, will cause great damage to the human body and the instrument device. Low smoke and low halogen flame retardant cable material is a special PVC resin as basic material, adding modifying agent, additives and excellent flame retardant, after full mixing uniform plasticizing processing of high-tech products. It not only has excellent flame retardancy, but also in the burning smoke emission is low, HCl emissions are very low, can be observed in the combustion flame and nearby objects. Compared with ordinary PVC sheath material, the tensile strength and elongation at break quite; no special screw extrusion, the process performance is also quite. Use the cable into the cable material, completely suitable for the locations of the subway, high-rise buildings, power stations, radio and television center and computer center high requirements on the flame retardancy of wire and cable.

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