Black polyethylene materials for wire and cable are a PE-based pellet material which is produced by mixing, plasticizing and granulating with accessory ingredients such as carbon black and antioxidants.
1、grade, name and application of products
|
GRADE |
NAME |
APPLICATION |
|
NDH |
Good-resistance to environmental cracking and low-density polyethylene black sheathing compound |
Sheath of communication cables, control cables, signal and power cables, which are required to be highly resistant to environmental cracking |
|
LDH |
Linear and low-density polyethylene black sheathing compound |
|
MH |
Medium-density polyethylene black sheathing compound |
Sheath of communication cables, fiber optic cable, submarine cable and power cable |
|
GH |
High-density polyethylene black sheathing compound |
|
NDJ |
Good-resistance to weather and low-density polyethylene black insulated compound |
Insulation of overhead cable or other similar cables at 1kV or below |
|
NLDJ |
Linear, good-resistance to weather and low-density polyethylene black insulated compound |
|
NMJ |
Good-resistance to weather and medium-density polyethylene black insulated compound |
Insulation of overhead cable or other similar cables at 10kV or below |
|
NGJ |
Good-resistance to weather and high-density polyethylene black insulated compound |
2、Executive Standard
GB/T 15065-2009
3、products properties
The properties of products are shown in Table 1 and Table 2.
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：
|
sections |
Section 1 |
Section 2 |
Section 3 |
Section 4 |
Extruder head |
die |
|
temperature/℃ |
160±10 |
170±10 |
180±10 |
190±10 |
195±10 |
200±10 |
5、Packaging, transportation and storage
Packaging：Net weight per 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 1: Products properties sheet
|
Test items |
NDH |
LDH |
MH |
GH |
|
Melt mass flow rate/（g/10min） ≤ |
2.0 |
2.0 |
2.0 |
2.0 |
|
Density/（g/cm3） |
≤0.940 |
≤0.940 |
0.940～0.955 |
0.955～0.978 |
|
Tensile strength/MPa ≥ |
13.0 |
14.0 |
17.0 |
20.0 |
|
Tensile yield stress/MPa ≥ |
- |
- |
- |
16.0 |
|
Tensile stain at break /% ≥ |
500 |
600 |
600 |
650 |
|
Low-temperature impact brittle temperature，-76 ℃ |
Pass |
Pass |
Pass |
Pass |
|
Resistance of Environmental Stress Cracking F0/h ≥ |
96 |
500 |
500 |
500 |
|
200 ℃ oxidative induction time /min ≥ |
30 |
|
Carbon black content /% ≥ |
2.60±0.25 |
|
dispersion of carbon black/class ≤ |
3 |
|
Vicat temperature /℃ ≥ |
- |
- |
110 |
110 |
|
Air oven heat aging |
test condition |
100 ℃×240h |
|
Tensile strength /MPa ≥ |
- |
13.0 |
16.0 |
20.0 |
|
Tensile stain at break /% ≥ |
- |
500 |
500 |
650 |
|
Breaking elongation at low temperature /% ≥ |
- |
- |
- |
175 |
|
dielectric strength Ed /（kV/mm） ≥ |
25 |
25 |
25 |
25 |
|
volume resistivity ρv / Ω·m ≥ |
1.0×1014 |
1.0×1014 |
1.0×1014 |
1.0×1014 |
|
dielectric constant εr ≤ |
2.80 |
2.80 |
2.75 |
2.75 |
|
dielectric loss factor tanδ ≤ |
- |
- |
Table 2: Products properties sheet
|
Test items |
NDJ |
NLDJ |
NMJ |
NGJ |
|
Melt mass flow rate /（g/10min） ≤ |
0.4 |
1.0 |
1.5 |
0.4 |
|
Density /（g/cm3） |
≤0.940 |
≤0.940 |
0.940～0.955 |
0.955～0.978 |
|
Tensile strength /MPa ≥ |
13.0 |
14.0 |
17.0 |
20.0 |
|
Tensile yield stress /MPa ≥ |
- |
- |
- |
16.0 |
|
Tensile stain at break /% ≥ |
500 |
600 |
600 |
650 |
|
Low-temperature impact brittle temperature,-76 ℃ |
Pass |
Pass |
Pass |
Pass |
|
Resistance of Environmental Stress Cracking F0/h ≥ |
96 |
500 |
500 |
500 |
|
Vicat temperature /℃ ≥ |
- |
- |
110 |
110 |
|
Air oven heat aging |
test condition |
100 ℃×240h |
|
Tensile strength /MPa ≥ |
12.0 |
13.0 |
16.0 |
20.0 |
|
Tensile stain at break /% ≥ |
400 |
500 |
500 |
650 |
|
Breaking elongation at low temperature /% ≥ |
- |
- |
- |
175 |
|
Artificial weathering 0～1008h |
change rate of tensile strength /% ≤ |
±25 |
±25 |
±25 |
±25 |
|
change rate of tensile strain at break /% ≤ |
±25 |
±25 |
±25 |
±25 |
|
Artificial weathering 504～1008h |
change rate of tensile strength /% ≤ |
±15 |
±15 |
±15 |
±15 |
|
change rate of tensile strain at break /% ≤ |
±15 |
±15 |
±15 |
±15 |
|
Resistance of Heat stress crackingF0 / h ≥ |
- |
- |
- |
96 |
|
dielectric strength Ed /（kV/mm） ≥ |
25 |
25 |
35 |
35 |
|
volume resistivity ρv / Ω·m ≥ |
1.0×1014 |
1.0×1014 |
1.0×1014 |
1.0×1014 |
|
dielectric constant εr ≤ |
- |
- |
2.45 |
2.45 |
|
dielectric loss factor tanδ ≤ |
- |
- |