Silane Cross-linkable PE Compound for 10KV and Below Cable Wire

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1000000kgs kg/month

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Product Description:

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℃.


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