1. Applications and cable specifications of LLHDPE granule:
Insulation of aerial cable, less than 1KV.
2. Description of LLDPE granule:
PE compound, based on PE resin, is produced and pelletized with the double corrugated screw, in which various additives are added. The compound is according to GB 15065-94 and IEC 60502. The compound has outstanding performances of processing, physical, mechanical and electrical properties.
3. Processing of LLDPE granule:
It is recommended that compound should be processed with extruder having a minimum L/D ratio of 25. Compound (not including ZPE) should be thoroughly dried before use, and the maximum drying temperature should not exceed 100°C.
The following temperature(°C) profile of extruder is recommended:
Note: The processing parameters are for reference only, optimal conditions may vary according to the equipment used. The cooling water tank should be used sectionally cooling with warm-water echelon in order to reduce internal stress.
Item |
Unit |
NDH |
GH |
LDH |
MH |
RDH |
| Standard |
Typical |
Standard |
Typical |
Standard |
Typical |
Standard |
Typical |
Standard |
Typical |
| Volume Resistivity at 20 degree C |
≥Ω*m |
1.0×1014 |
1.1×1015 |
1.0×1014 |
8.0×1014 |
1.0×1014 |
8×1014 |
1.0×1014 |
3.6×1014 |
1.0×1013 |
3.0×1013 |
| Dielectric Strength |
≥MV/m |
25 |
37 |
25 |
35 |
25 |
32 |
25 |
35 |
25 |
28 |
| Dielectric Constant |
≤ |
2.8 |
2.36 |
2.75 |
2.4 |
2.8 |
2.35 |
2.75 |
2.4 |
- |
- |
| Dielectric Loss, Angular Tangent |
≤ |
- |
- |
0.005 |
0.0006 |
- |
- |
0.005 |
0.001 |
- |
- |
| Melt Flowing Index |
≤g/10min |
2 |
0.9 |
0.5 |
0.3 |
2 |
1.1 |
1 |
0.5 |
2 |
1.9 |
| Density |
g/cm3 |
0.920-0.949 |
0.936 |
0.950-0.978 |
0.953 |
0.920-0.945 |
0.938 |
0.940-0.955 |
0.945 |
- |
- |
| Tensile Strength |
≥MPa |
13 |
19 |
20 |
23 |
≥14.0 |
18 |
≥17.0 |
23 |
13 |
17 |
| Yield Strength |
≥MPa |
- |
- |
16 |
20 |
- |
- |
- |
- |
- |
- |
| Elongation at Break |
≥% |
500 |
790 |
650 |
850 |
600 |
700 |
600 |
800 |
500 |
590 |
| Low Temp. Elongation at Break |
≥% |
- |
- |
175 |
210 |
- |
- |
- |
- |
- |
- |
| Impact Brittleness in low temp. |
≤°C |
-76 |
Pass |
-76 |
Pass |
-76 |
Pass |
-76 |
Pass |
-76 |
Pass |
| Dispersity of Carbon Black |
≥ Scatter |
6 |
7 |
6 |
7 |
6 |
7 |
6 |
7 |
6 |
7 |
| Carbon Black Content |
% |
2.60±0.25 |
2.6 |
2.60±0.25 |
2.6 |
2.60±0.25 |
2.6 |
2.60±0.25 |
2.6 |
2.60±0.25 |
2.6 |
| Resistance to Environmental Stress Crack F0 |
≥h |
96 |
Pass |
500 |
Pass |
500 |
Pass |
200 |
Pass |
96 |
Pass |
| 200 degree C Oxidative Induced Time |
≥min |
30 |
Pass |
- |
- |
30 |
Pass |
30 |
Pass |
30 |
Pass |
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