Description
Grade 4214/4214B is suitable for 10kv and below medium and low voltage cable, it is composed by 95% silane crosslinkable low density polyethylene (compound A) and 5% catalyst (compound B). The main raw materials of the product are cable-use high-purity LDPE compound with mature graft technique and low impurity content, the product’s major characteristics are
◆The product is suitable for the extrusion method of squeezing extrusion,half-tubing extrusion and tubing extrusion.
◆Cables made from the product have excellent performance in smooth cablesurface, high extrusion speed and production efficiency.
◆Extremely low impurity content and excellent electric performance.
Standard
After crosslinked in the tepid water, the cable made from the product grade 4214/4214B can comply with the standard of IEC60502-2004,GB/T12706-2002.
Main Properties & Typical Values
Test items | Test method | Unit | Standard | Typical value |
Tensile strength | GB/T1040.3 | MPa | ≥14.0 | 21.5 |
Elongation at break | GB/T1040.3 | % | ≥350 | 480 |
Heat ageing properties (Test temperature 135℃, 168hr) Maximum tensile strength change Maximum elongation at break change | GB/T8815 |
% % |
±20 ±20 |
7.0 5.2 |
Heat elongation （200±3)℃x15minx0.2MPa) Maximum elongation change under load Maximum permanent elongation change after cooled | GB/T2951 |
% % |
≤80 ≤5 |
46 -4 |
Impact brittle temp. (-76℃) | GB/T5470 | --- | ≤15/30 | Pass* |
Dielectric Strength | GB/T1408.1 | MV/m | ≥35 | 39* |
Dielectric loss factor 50Hz, 20℃ | GB/T1409 | --- | ≤1×10-3 | 7×10-4* |
Dielectric constant 50Hz, 20℃ | GB/T1409 | --- | ≤2.35 | 2.25* |
Volume resistance (20℃) | GB/T1410 | Ω.m | ≥1.0×1014 | 5×1014* |
Typical values were tested on the 1mm sample strip by squeezing film extrusion after mixing compound of A & B (at percentage of95:5) and be boiled in 90℃ water for four hours.
*Especially, these typical values were tested by press moulding sample 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 4214/4214B.
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 | 165~175 | 175~190 | 190~200 |
Die head setting: Squeezing extrusion style, half-tubing extrusion style and tubing extrusion style
Cooling water temperature: Should not be less than 25℃,gradual cooling water tank is recommended.
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℃.
Please contact our customer service for more technical service.
Shanghai New Shanghua Polymer Material Co.,Ltd.
Add: NO.55，XinhanRoad,Xinchang Industrial Zone,Pudong Shanghai Tel:021-65193960 Fax:021-65707269
