CMC can be used in the paper industry. CMC can be used as paper surface smoothing agent and sizing agent in paper industry. Adding 0.1% to 0.3% CMC to the pulp can enhance the tensile strength of the paper by 4% to 5%. The compressive rupture strength is increased by 50%, and the flexibility is increased by 4-5 times. It can replace casein to make the paper uniform, and the ink can easily penetrate during printing, so that the edge is clear.

On the paper treated with CMC aqueous solution, coating the solution of metal salts such as iron and lead can be made into waterproof and anti-paint, ion exchange resin paper, etc. for special purposes.