甲醛，化学式HCHO或CH₂O，式量30.03，又称蚁醛。无色气体，有刺激性气味，对人眼、鼻等有刺激作用。气体相对密度1.067(空气=1)，液体密度0.815g/cm³(-20℃)。熔点-92℃，沸点-19.5℃。易溶于水和乙醇。水溶液的浓度最高可达55%，通常是40%，称做甲醛水，俗称福尔马林(formalin)，是有刺激气味的无色液体。
Formaldehyde, chemical formula HCHO or CH ν o, formula amount 30.03, also known as formic aldehyde. Colorless gas with pungent smell and irritating effect on human eyes and nose. The relative density of gas is 1.067 (air = 1), and the density of liquid is 0.815g/cm ³(- 20℃)。 Melting point - 92 ℃, boiling point - 19.5 ℃. Soluble in water and ethanol. The concentration of aqueous solution can reach up to 55%, usually 40%, which is called formaldehyde water, commonly known as formalin. It is a colorless liquid with pungent smell.
有强还原作用，特别是在碱性溶液中。能燃烧，蒸气与空气形成爆炸性混合物，爆炸极限7%-73%(体积)。着火温度约300℃。河北立体车库 消防报警器塑料配件 电缆接地箱 电缆保护接地箱 塑料土工格栅 消弧线圈装置
It has strong reducing effect, especially in alkaline solution. It can burn, vapor and air form an explosive mixture, and the explosion limit is 7% - 73% (volume). Ignition temperature is about 300 ℃.
甲醛可由甲醇在银、铜等金属催化下脱氢或氧化制得，也可由烃类氧化产物分出。用作农药和消毒剂，制酚醛树脂、脲醛树脂、维纶、乌洛托品、季戊四醇和染料等的原料。
Formaldehyde can be prepared by dehydrogenation or oxidation of methanol catalyzed by silver, copper and other metals, or separated from hydrocarbon oxidation products. It is used as pesticide and disinfectant, and as raw materials for phenolic resin, urea formaldehyde resin, vinylon, urotropine, pentaerythritol and dyes.