Loading Port:Shanghai
Payment Terms:TT OR LC
Min Order Qty:-
Supply Capability:1000000kgs kg/month
Description
Grade 4215 is specially used for 10KV below aerial hanging power cable, it is composed by 90% silane crosslinkable low density polyethylene (compound A) and 10% black catalyst (compound B). The product has outstanding performance in anti-ageing property, wild processing temperature,easy processing characteristics and excellent product quality.
Standard
After crosslinked in the tepid water, the cable made from the product grade 4215 can comply with the standard of IEC60502-2004, GB/T14049-2008.
Main Properties & Typical Values
Test Items | Unit | Test Method | Standard | Typical value |
Tensile strength | MPa | GB/T1040.3 | ≥13.5 | 19.0 |
Elongation at break | % | GB/T1040.3 | ≥300 | 460 |
Heat ageing properties (Test temperature 135℃, 168hr) Maximum tensile strength change Maximum elongation at break change |
% % | GB/T8815 |
±20 ±20 |
7.2 6.0 |
Heat elongation （200±3)℃x15minx0.2MPa) Maximum elongation change under load Maximum permanent elongation change after cooled |
% % | GB/T2951 |
≤80 ≤5 |
60 2 |
Impact brittle temp. (-76℃) Impact brittle | Failure no. | GB/T5470 | ≤15/30 | pass* |
Dielectric Strength | MV/m | GB/T1408.1 | ≥30 | 37* |
Dielectric loss factor 50Hz, 20℃ | -- | GB/T1409 | ≤1×10-4 | 1×10-4* |
Dielectric constant 50Hz, 20℃ | -- | GB/T1409 | ≤2.35 | 2.2* |
Volume resistance (20℃) | Ω·m | GB/T1410 | ≥1.0×1014 | 1×1014* |
Pressure crack test F50 | hr | GB/T2951 | 1000 | pass* |
Artificial atmosphere ageing properties: Ageing After 42days, Maximum tensile strength change Maximum elongation at break change Ageing after 42days vs. after 21days Maximum tensile strength change Maximum elongation at break change |
% %
% % | GB/T14049 |
±30 ±30
±15 ±15 |
-15 -20
-10 -11 |
Typical values 1-4, 11 were tested on the sample strip by squeezing film extrusion after mixing compound of A & B (at percentage of 90:10) and be boiled in hot water at 90℃ for 4 hours.
*Especially, these typical values were tested by press moulding sample (A and B mixed atpercentage of 90:10), under the condition of 180±2 ℃, 15min, and pressure over 15Mpa, then boiled in 90℃ water for four hours.
Recommended Processing Technique
1. Extrusion Equipment
Most extruders for PVC and PE suit for 4215
The recommended equipment and processing technique is as following.
Ratio of length and diameter 18—25:1
Diameter 45—120mm
Ratio of compressing 1.5—3.5
Ratio of elongation 1:1.0—1:1.5
Filtering mesh 40/60/40
2. Extruder processing temperature and other related settings
Temperature Setting: Specific processing temperature should be based on different equipment and pressing conditions, reference settings are as following:
Feeding Section（℃） | Compression Section（℃） | Measurement Section （℃） | Die head and Mould （℃） |
150~165 | 165~177 | 175~190 | 190~200 |
Die head setting: Squeezing extrusion style and tubing extrusion style
Cooling water temperature: Should not be less than 25℃, when using tubing style extrusion method, gradual cooling water tank is recommended for better control the heat shrinkage.
3. Crosslink
After extrusion and cooling, the cable can be crosslinked by immersed in hot water (90℃) or exposed in low pressure vapour. The time required for crosslink is based on the thickness of the insulation and the coil size, the thicker the insulation and the greater the coil size, the longer the crosslink time required. The crosslink time can be calculated according to the equation of 4hr/mm for 90℃.
