Formaldehyde is usually a colorless gas with a pungent smell. Soluble in water and ether, the highest concentration of aqueous solution can reach 55%, and it can be mixed with organic solvents such as ethanol and acetone in any proportion. Therefore, class C clothes can remove formaldehyde after washing.

Formaldehyde is an organic chemical substance with chemical formula of HCHO and molecular weight of 30.03, also known as ant aldehyde. The relative density of gas is 1.067 (air = 1), and the density of liquid is 0.8 15g/cm(-20℃). Melting point -92℃, boiling point-65438 09.5℃.