... ,3025-2, 3025-1 have good michanical property insulation board Phenolic cotton laminated sheet 3025-3,3025-2, ... applications ,for machines & appliances having higher voltages but lower electrical stress (slot wedges ,spacers) as material for bearing , ... oil resistance and dielectric property, as electrical materials with low electric property. insulation board Phenolic cotton laminated sheet 3025-3, ...