Sr.

Performance

Unit

Test method

Index value

1

Vertical layer direction bending strength

MPa

GB/T5130 section 5.1

≥ 152

2

Parallel layer direction compact strength(Simple strut-beam)

KJ/m2

GB/T5130 section 5.5

≥ 25

3

Parallel layer direction compact strength(Suspended arm beam method)

KJ/m2

GB/T5130 section 5.5

≥ 26

4

Relative dielectric factor (1 MHZ below)

GB/T5130 section 6.2

≤5.5

5

Mediate loss factor(1 MHZ below)

GB/T5130 section 6.2

≤ 0.04

6

Vertical layer direction electric strength at (90±2)°c oil.

MV/m

GB/T5130 section 6.1

Refer to table 2

7

Parallel layer direction breakdown voltage at (90±2)°c oil.

kV

GB/T5130 section 6.1

≥ 15

8

Insulation resistance after water dipping

Ω

GB/T5130 section 6.3

≥ 3.0 × 108

9

Density

g/cm3

GB/T5130 section 8.1

1.7-2.0

10

Water absorption

mg

GB/T5130 section 8.2

Refer to table 3

Table 2: Vertical layer direction electric strength

Average thickness mm

Electric strength MV/mm

Average thickness mm

Electric strength MV/mm

Average thickness mm

Electric strength MV/mm

0.4

≥ 16.9

1.0

≥ 14.2

2.2

≥ 11.4

0.5

≥ 16.1

1.2

≥ 13.7

2.4

≥ 11.1

0.6

≥ 15.6

1.4

≥ 13.2

2.5

≥ 10.9

0.7

≥ 15.2

1.6

≥ 12.7

2.6

≥ 10.8

0.8

≥ 14.8

1.8

≥ 12.2

2.8

≥ 10.5

0.9

≥ 14.5

2.0

≥ 11.8

3.0

≥ 10.2