Formaldehyde is a colorless gas with a strong pungent odor. Soluble in water, alcohol and ether. Formaldehyde is a gas at room temperature, usually in the form of an aqueous solution of 35 to 40% Formaldehyde solution is called formalin. Formaldehyde Health aldehyde molecule condensation reaction, can be obtained phenolic resin (Bakelite). Formaldehyde major harm is done to the stimulation of skin and mucous membranes. Formaldehyde in a room reaches a certain concentration, people have discomfort, more than Formaldehyde 0.08m3 of concentrations can cause red eyes, itchy eyes, throat discomfort or pain, hoarseness, sneezing, chest tightness, wheezing, dermatitis, may refer to "three-wood child in addition to aldehydes Law" governance. 
Formaldehyde is an important organic raw material, mainly used in the plastics industry (such as the making of phenolic resins, urea-formaldehyde plastic - electric Jade), synthetic fibers (such as synthetic vinylon - polyvinyl Formaldehyde), leather industry, medicine, dyes and the like. Formalin has bactericidal and corrosion resistance, biological specimens can be soaked, the dilute solution (0.1-0.5%) can be used to seed soaking on agriculture, to seed disinfection commonly used in industry by the catalytic oxidation of methanol to take Formaldehyde. Formaldehyde can be used with silver silver mirror reaction produces ammonia solution, so that the inner wall of the tube attached to a thin layer of bright as a mirror of metallic silver (silver compound is reduced state, Formaldehyde is oxidized); generating a red precipitate cuprous oxide hydroxide suspension with fresh reaction . 
Density 1.081 ~ 1.085g / mL 
Flash point 60 ℃ 

Chemical formula CHO 
Boiling point -19.5 ℃ 
Product name Formalin

Formaldehyde belongs Uses extensive production process is simple, adequate supply of raw materials of mass chemical products, methanol downstream products in the tree trunk, the world's annual output of about 25 million tons, about 30 percent are used for the production of methanol Formaldehyde. But Formaldehyde is a low concentrations of aqueous solution, from an economic point of view is not easy to transport over long distances, it is generally in the vicinity of the main consumer markets factories, import and export trade rarely. Formaldehyde can be directly used in addition to disinfection, sterilization, preservatives, mainly used in organic synthesis, synthetic materials, paints, rubber, pesticides and other industries, and its derivative products are mainly poly-Formaldehyde, polymer Formaldehyde, phenol-formaldehyde resins, urea-formaldehyde resins, amino resins, Wu Luotuo products and polyols and the like. Panel Industry developed, demand for Formaldehyde is very big. 
Formaldehyde The Uses very broad, synthetic resins, surfactants, plastics, rubber, leather, paper, dyes, pharmaceuticals, pesticides, photographic film, explosives, construction materials and disinfection, fumigation and corrosion process are to use Formaldehyde, we can say Formaldehyde is the chemical industry generalists, but use anything must have a limit, there is a standard, if used beyond the standard and limited edition, it will bring a downside.

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