Complaint
Index. | Unit | Values | ||||
| electrical presspahn Cardboard transformer insulation pressboard |
| ≤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 aquesous 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 | |
