IEC Compliant Pure Wood Pulp Electrical Pressboard High Density Transformer Insulation Pressboard for Oil Immersed Power Transformer

IEC Compliant Pure Wood Pulp Electrical Pressboard High Density Transformer Insulation Pressboard for Oil Immersed Power Transformer. Made from 100% unbleached sulfate softwood pulp, no adhesive or filler, bonded by fiber hydrogen-bond. Class A thermal resistance, long-term operating temperature up to 105 degree C, compliant with GB/T 19264.3-2013 and IEC 60641-3-1. Density 1.00-1.20 g per cubic centimeter, stable dimension, low thermal shrinkage at 120 degree C, MD less than or equal to 0.8 percent, TD less than or equal to 1.2 percent. High mechanical performance, MD tensile strength 90-105 MPa, interlayer bonding strength greater than or equal to 12 N per 30 mm, good compressibility 45-50 percent. Excellent dielectric property, dielectric strength greater than or equal to 12 kV per mm in air, stable insulation performance under 90 degree insulating oil condition. Low dissipation factor less than or equal to 0.008 in oil at 90 degree C, low water-extract conductivity, suitable for oil-immersed transformer and mutual inductor insulation parts. Thickness range 0.20-4.0 mm, Length 2000mm, Width 1000mm custom slitting and cutting service available. Air dielectric strength: greater than or equal to 12 kV per mm Oil dielectric strength varies with sheet thicknes.