H4 Transformer Board Production Description: 1) Pre-compressed Pressboard, with Quality Standard: IEC60641-3-1:1992/GB/T 19264.3-2003 2) Thickness: 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 4.0mm, 5.0mm, 6.0mm, 7.0mm, 8.0mm 3) Material: 100% unbleached sulfate pulp imported from Canada, Russia. 4) High density, high mechanical strength, high electric strength and low compression index. 5) 4400mm*2200, 6400mm*3200mm and customized size Transformer pressboard: Large Size:4400*1600mm,4200*2100mm,4000*2000mm; Medium Size: 2200*1600mm,2200*1470mm,2200*1400mm; Small Size: 2200*1100mm, 2200*1000mm,2000*1000mm. Usage: Mainly used in oil-immersed transformer as insulation material, also used in reactor mutual inductance ware, electric device and etc. Wrapped with vinyl film for waterproof, weaved material, then core paper packed, and wooden pallets.