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 |