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Description:
Mainly used in transformer making, as a protective layer forelectric instruments and electric switches.Electricity IsolatedPaperboard
Standard: QB/T3503-1999
Proportion: 100/00
NO. | Item | Standard | Result |
1 | Thickness, mm | 0.1-0.5 | 0.3 |
2 | Tightness, g.cm3 | 1.10-1.25 | 1.0 |
3 | Tensile strength(Vertical), N/mm2 | ≥90 | 90 |
4 | Tensile strength(Horizontal), N/mm2 | ≥35 | 37 |
5 | Tensile stretch(Vertical), % | ≥3.5 | 3.5 |
6 | Tensile stretch(Horizontal), % | ≥4.0 | 4.0 |
7 | Ash content, % | ≤1.0 | 1.0 |
8 | PH of water extract | 6-9 | 7.0 |
9 | Conductivity of water extract, ms/m | ≤10 | 1.0 |
10 | Electrical strength in air, kV/mm | ≥11 | 11 |
11 | Electrical strength after folding, kV/mm | ≥8 | 8 |
12 | Moisture, % | 6-10 | 7 |
13 | Appearance |
| Qualified |
