With natural sulfite chemical wood pulp or cotton pulp, after beating, sizing, without filling (material), made on the long net paper machine. The base paper is impregnated with swelling agent (concentrated zinc chloride solution or cuprammonium solution) to make the cellulose moistened and gummed, and then bonded layer by layer on the gumming machine, and then made into steel paper after aging, water immersion and desalting, drying and shaping. Generally add red or gray. For electromechanical, textile and other industries to produce a variety of tool gaskets, insulation materials and other parts.

      Vulcanized fiber is a special paper treated by special technology, which is used as insulation materials and heat insulation materials.

      It has excellent elasticity, wear resistance, corrosion resistance, heat resistance, mechanical strength, insulation properties and machining molding properties. The processed products are durable, lightweight (lighter than aluminum) and beautiful. Base paper has high strength, low ash content and good water absorption.