Description
Grade 4251Q is silane XLPE compound with monosil method (one step) and is specially used for low voltage cable & wire. The product is composed by specific chosen LDPE material mixed with other additives.The product has outstanding performance and major characteristics are
◆The product is suitable for the extrusion method of squeezing extrusion.
◆Cables made from the product have excellent performance in smooth cablesurface, high extrusion speed and production efficiency.
◆Suitable for cable cross-sectional area less than 16mm2.
Standard
Performance test is in accordance with JB/T 10437-2004standard. After crosslinked in the tepid water, the cable made from the product grade 4244Q 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 | 24.3 |
Elongation at break | GB/T1040.3 | % | ≥350 | 692 |
Heat ageing properties (Test temperature 135℃, 168hr) Maximum tensile strength change Maximum elongation at break change | GB/T8815 |
% % |
±20 ±20 |
13 7.4 |
Heat elongation （200±3)℃x15minx0.2MPa) Maximum elongation change under load Maximum permanent elongation change after cooled | GB/T2951 |
% % |
≤100 ≤5 |
80 -4 |
Dielectric strength | GB/T1408.1 | MV/m | ≥30 | 45* |
Volume resistance (20℃) | GB/T1410 | Ω.m | ≥1.0×1014 | 2.8×1014* |
Typical values were tested on the 1mm sample strip by squeezing film extrusion and be boiled in hot water at 90℃ 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 4251Q
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 bebased on different equipment and pressing conditions, reference settings are as following:
Feeding Section（℃） | Compression Section（℃） | Measurement Section （℃） | Die head and Mould （℃） |
150~160 | 160~180 | 180~200 | 200~210 |
Die head setting: Squeezing extrusion style is recommended
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
