Pressboard Strip and Spacer
Introduction
Insulation class A (105 ° C)
100% sulphate pulp
Natural-coloured
Precompressed pressboard, even fibre orientation, hard and dimensionally stable
High purity and mechanical strength
Low shrinkage, fibre-free surfaceGood compatibility with liquid dielectrics
|
Index. |
Unit |
Values |
≤1.6 |
>1.6~3.0 |
>3.0 |
1 |
Nominal thickness tolerance |
% |
≤10(±) |
2 |
Nominal Grammage |
g/cm3 |
1.00~1.20 |
1.00~1.25 |
1.15~1.30 |
3 |
Shear strength ,M.D. |
Mpa |
≥100 |
≥105 |
≥110 |
4 |
Shear strength, C.M.D. |
Mpa |
≥75 |
≥80 |
≥85 |
5 |
Elongation (M.D.) |
% |
≥3.0 |
6 |
Elongation (C.M.D.) |
% |
≥4.0 |
7 |
Shrinkage |
% |
≤10.0 |
≤7.5 |
≤5.0 |
8 |
Shrinkage which would resume |
% |
≥45 |
≥50 |
≥50 |
11 |
Shrinkage: |
M.D. |
% |
≤0.5 |
C.M.D. |
≤0.7 |
Thickness direction |
≤4.0 |
12 |
Moisture content |
% |
≤6.0 |
13 |
Ash content |
% |
≤1.0 |
14 |
Electrical conductivity of aqueous extract |
ms/m |
≤1.6 |
>1.6~3.0 |
>3.0 |
15 |
Aquesous extract (PH) |
- |
6~9 |
16 |
Oil absorption |
% |
≥11.0 |
≥9.0 |
≥7.0 |
17 |
Voltage resistant strength(In air) |
MV/m |
≥12 |
≥11 |
≥10 |
18 |
Voltage resistant strength(In oil) |
MV/m |
≥40 |
≥35 |
≥30 |