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 |