Unbleached sulphate pulp Smooth.tough.mechanical and electric intensity Electrical insulating paper Model: P.4.1 Standard: IEC641 - ... sulphate pulp Characteristics: smooth, full of tenacity, high mechanical and electrical strength. Color: Natural Brown green, red, yellow, etc ... to make polyester film/Kraft paper flexible laminate, electrical insulating paperboard, etc.Special size and thickness can ...