3025 phenolic cotton cloth laminate sheet is made of good cotton cloth and phenolic resin.
1,Dielectric strength perpendicular to laminations(in 90±5℃ transformer oil, 1 mm in thickness) min 4MV/m
2,Impact strength parallel to laminations (Charpy) min25 KJ/m2
3,Bonding strength (≥10mm in thickness) min 5500N| General Properties | ||||
| Test Item | Unit | TypicalValue | ||
| Grade | ||||
| 3025 | 3025B | |||
| Flexural strength perpendicular to laminations | ≥ | MPa | 91 | 107 |
| Bonding strength(≥10mm in thickness) | ≥ | N | 5500 | 5390 |
| Insulation resistance after immersion in water(D-24/23) | ≥ | MW | ||
| Dielectricstrengthperpendiculartolaminations | ≥ | MV/m | 4 | 4 |
| (in90±5℃transformeroil,1mminthickness) | ||||
| Breakdown voltage parallel to laminations | ≥ | KV | ||
| (in90±2℃transformeroil) | ||||
| Permittivity(50Hz) | ≤ | — | ||
| Permittivity(1MHz) | ≤ | — | ||
| Dissipationfactor(50Hz) | ≤ | — | ||
| Dissipationfactor(1MHz) | ≤ | — | ||
| Tensilestrength | ≥ | MPa | 55 | 68 |
| Impact strength parallel to laminations(Charpy) | ≥ | KJ/m2 | 25 | 25 |
| Density | g/cm3 | (1.30-1.40) | (1.30-1.45) | |
| Water absorption(D-24/23,1.6mm in tickness) | ≤ | mg | 220 | - |
| Color | — | Natural | ||
| Reference standard | — | JB/T8149.2-2000 | Enterprise Standard | |
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