Hard steel paperboard is made of steel paper base paper after being treated with zinc chloride (ZnCl2 _ 2 _ 2) solution, followed by bonding, desalting and aging, cleaning and drying, hot pressing and other processes. It has the characteristics of light weight, firmness, good elasticity and high electrical insulation. Divided into hard steel paper and soft steel paper.

Applied discipline: material science and technology (first-class discipline); Natural materials (two disciplines); Paper (two disciplines) steel paper is a kind of special paper that has been treated by special technology, and is mostly used as insulation material and heat insulation material.

■ Industrial application

Hard steel paperboard is widely used. It has the characteristics of hard body, soft body, wear resistance, acid resistance and high temperature resistance. Widely used in textile industry, household appliances, national defense, aircraft, ships, railways and so on.