Hydroxyethyl methyl cellulose (HMEC) is an odorless, tasteless, non-toxic white powder, can be dissolved in cold water, forming a transparent viscous solution. With thickening, adhesion, dispersion, emulsification, film formation, suspension, adsorption, gelation, surface activity, moisture retention and protective colloid and other characteristics. Due to the surface active function of aqueous solution, it can be used as colloid protective agent, emulsifier and dispersant. Hydroxyethyl methyl cellulose aqueous solution has good hydrophilicity and is an efficient water-retaining agent. Hydroxyethyl methyl cellulose contains Hydroxyethyl group, so it has good anti-mold ability, long-term storage has good viscosity stability and anti-mildew.