Description

Grade 4251N is monosil (one step) natural curing silane XLPE compound, it is suitable for 1kv and below low voltage cable and wire, it is composed by compound A and compound B. Compound A is high-quality special polyethylene material and imported silane crosslink agent, while compound B adopts the advanced catalyst system. The product can be quickly crosslinked in hot water or after some time exposed in the air. The product’s major characteristics are

◆Quick crosslink speed, not necessary be boiled in hot water, simplify the procedure, and improve the production efficiency and cost saving.

◆Non-corrosive to the equipment line, non-corrosive to copper conductor.

◆Less affected by the masterbatch.

◆Suitable for tubing extrusion method.

◆Halogen free, and environment friendly.

Standard

Performance test is in accordance with JB/T 10437-2004 standard. The cable made from the product grade 4251N can comply with the standard of IEC60502-2004, GB/T12706-2002.

Main Properties & Typical Values

Typical values were tested on the 1mm sample strip by squeezing film extrusion after mixing compound of A& B (at percentage of 95:5), double-sided exposure in the  constant temperature and humidity box (23℃, relative humidity 75%) and measured after 48 hours.

* Especially, these typical values were tested on fully solidified and cured sample(If the sample is not fully cured, it will continue the curing during ageing procedure, and consequently will affect the test result before and after heat ageing).

**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 one hour.

Recommended Processing Technique

1.   Extrusion Equipment

The product is easy to be plasticized, most PVC and PE-use extruder can be used, the equipment requirement is relatively simple screw structure and the flow way is smooth and no dead end.

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:

Die head setting: 4251N is suitable for tubing extrusion style and half-tubing extrusion style, the recommended draw ratio is less than 1.2, the greater the draw ratio the greater the thermal shrinkage.

Cooling water temperature: Should not be less than 25℃, gradual cooling water tank is recommended to better control the heat shrinkage.

Conductor temperature: Appropriate warm-up the copper or aluminium conductor, which can further reduce the heat shrinkage of the insulation and accelerate the cross link speed.

Crosslink Speed

For the cable made from this material, the cross link speed has close relation to the insulation thickness, ambient temperature, environment humidity and coilsize. The thinner and smaller the coil size, the higher temperature and humidity, the shorter the time needed for cross linking. During cold and dry winter season, the crosslink speed in natural environment will be comparatively slow down. To reduce the cross linking time, it is recommended to spray some hot water on the surface of the insulation to accelerate cross link procedure.

Note:The above data were tested on the sample by squeezing film extrusion after mixing compound of A & B (at percentage of 95:5),double-sided exposure in the constant temperature and humidity box;the above value may differ from the actual cross link speed.