Formalin
Formaldehyde ( for-MAL-di-hide, US also fər-) (systematic name methanal) is a pungent colorless gas mainly used in the production of industrial resins, such as for particle board, coatings, plastics, pulp, paper, synthetic fibers, and textiles. A ~5% solution in water of formaldehyde is used as a disinfectant and fumigant in industrial, agricultural, and healthcare settings, and a ~37% solution is used to preserve tissue samples in labs. In 2024, the global production of formaldehyde was estimated at 26 million tons per year, and is a precursor to many other materials and chemical compounds.
It is an organic compound with the chemical formula CH2O and structure H2C=O. The gas spontaneously polymerizes into paraformaldehyde. It is stored as a ~37% aqueous solution known as formalin, which consists mainly of the hydrate CH2(OH)2. It is the simplest of the aldehydes (R−CHO).
Formaldehyde also occurs naturally. It is derived from the degradation of serine, dimethylglycine, and lipids. Demethylases act by converting N-methyl groups to formaldehyde.
Formaldehyde is classified as a group 1 carcinogen and can cause respiratory and skin irritation upon exposure.
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