Cold-resistant (Flame-retardant) PVC sheath materials for wire and cable are a PVC-based pellet material which is produced by mixing and granulating with accessory ingredients such as plasticizers , toughening cold , filler ( flame retardant ) , stabilizers , lubricants and colorants.
1. Model, name and application of products
|
Model |
name |
application |
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HD-70 |
Cold-resistant PVC sheath materials at 70 ℃ |
Cold insulation for wire and cable at the thermal class of 70 ℃ |
|
HDZ-70 |
Cold-resistant and Flame-retardant PVC sheath materials at 70 ℃ |
Cold-resistant and Flame-retardant insulation for wire and cable at the thermal class of 70 ℃ |
|
HD-90 |
Cold-resistant PVC sheath materials at 90 ℃ |
Cold insulation for wire and cable at the thermal class of 90 ℃ |
|
HDZ-90 |
Cold-resistant and Flame-retardant PVC sheath materials at 90 ℃ |
Cold-resistant and Flame-retardant insulation for wire and cable at the thermal class of 90 ℃ |
2. Executive Standard
Q/WRD 002-2016
3. Products properties
The products properties are shown in Table 6.
4. Processing
Single screw extruder is used in processing, with the aspect ratio of screw L/D≥20. The recommended reference processing temperature is shown below:
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Sections |
Section 1 |
Section 2 |
Section 3 |
Section 4 |
Extrusion head |
Die |
|
Temperature/℃ |
150±10 |
160±10 |
170±5 |
175±5 |
170±5 |
170±5 |
5. Packaging, transportation and storage
Package: net weight of each bag (25±0.2) kg. The inner bag is polyethylene film and the outer bag is craft paper composites.
Transportation and storage: no exposure to sunshine and rain during transportation. It should be stored in clean, cool, dry and ventilated warehouse.
Table 6 Products properties
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Test items |
HD-70 |
HDZ-70 |
HD-90 |
HDZ-90 |
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Tensile strength/MPa ≥ |
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Tensile strain at break/% ≥ |
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Thermal deformation ≤ |
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Impact brittle property |
Test temperature /℃ |
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Impact brittle property |
Pass |
Pass |
Pass |
Pass |
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Thermal stabilization time at 200℃/min ≥ |
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volume resistivity at 20℃/Ω·m ≥ |
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dielectric strength /（MV/m）≥ |
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Oxygen Index/% ≥ |
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Thermal aging test temperature/℃ |
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Thermal aging test time/h |
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Tensile strength after aging/MPa ≥ |
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The biggest change rate of tensile strength/% |
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Tensile strain at break after aging/% ≥ |
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The biggest change rate of tensile strain at break/% |
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Mass loss of thermal aging |
Test temperature/
℃ |
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Test time/h |
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Mass loss/(g/cm2) ≤ |
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