Medium Voltage Resistant Wire Insulation Overhead Line Silicon Cover

Serial No.

Properties

Unit

Standard Data

Test Results

Test Methods

1

Electrical Strength Test

KV/mm

20

22

GB/T 1408.1-2006

2

Volume Resistivity

Ω.cm

1×10¹⁴

2×10¹⁴

GB/T 1410-2006

3

Dielectric Constant

2-3

2.3

GB/T 1409-2006

4

Shore Hardness

70±5

7.1

GB/T 531

5

5.1

5.2

Mechanical Properties

Before ageing

Tensile Strength

Elongation at break

After Heat ageing(180°C, 7d)

Tensile Strength Change

Elongation Change

MPa

%

%

4.0

200

±30

±30

5.5

243

13

-22

GB/T 528

6

Low Temperature Elongation(-15°C, 2h)

%

20

190

GB/T 2951.4-1997

7

Low Temperature Flexibility(-50°C, 4h)

-

No cracks

No cracks

UL224-2004

8

High Temperature Crack Resistance(155°C, 2h)

-

No cracks

No cracks

GB/T2951.6-1997

Voltage(kV)

10kV

35kV

110kV

220kV

Thickness(mm)

2.3mm

2.3-3.0mm

4.0-6.0mm

6.0-8.0mm