Black Low Shrinkage Silane XLPE Compound for 10KV and Below Aerial Hanging Cable

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Loading Port:: Shanghai

Payment Terms:: TT OR LC

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Supply Capability:: 1000000kgs kg/month

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Description

Grade 4245 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’s major characteristics are

◆Outstanding anti-ageing property

◆Low heat shrinkage rate

◆wild processing temperature, easy processing technique and convenient handling

◆Suitable for tubing style extrusion mould.

Standard

After crosslinked in the tepid water, the cable made from the product grade 4245 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	19.6
Elongation at break	%	GB/T1040.3	≥300	480
Heat ageing properties (Test temperature 135℃, 168hr) Maximum tensile strength change Maximum elongation at break change	% %	GB/T8815	±20 ±20	8.9 6.7
Heat elongation （200±3)℃x15minx0.2MPa) Maximum elongation change under load Maximum permanent elongation change after cooled	% %	GB/T2951	≤80 ≤5	48 4
Impact brittle temp. (-76℃) Impact brittle	Failure no.	GB/T5470	≤15/30	Pass*
Dielectric Strength	MV/m	GB/T1408.1	≥30	39*
Dielectric loss factor 50Hz, 20℃	--	GB/T1409	≤1×10^-4	3×10^-4*
Dielectric constant 50Hz, 20℃	--	GB/T1409	≤2.35	2.3*
Volume resistance (20℃)	Ω·m	GB/T1410	≥1.0×10¹⁴	5×10^14*
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	-17 -26 -8 -12

Typical values 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 four hours.

*Especially, these typical values were tested by press moulding sample (A and B mixed at percentage 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 4245

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

（℃）

135~155

155~170

170~180

180~200

Die head setting: Tubing extrusion style 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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