Chapter 5.8 Formaldehyde
WHO Regional Office for Europe, Copenhagen, Denmark, 2001 1 Chapter Formaldehyde General description Physical and chemical properties Formaldehyde (H2C=O) is a flammable, colourless reactive and readily polymerized gas at normal room temperature and pressure, with a relative molecular mass of and a pungent odour. Formaldehyde is soluble in water, ethanol and diethyl ether and is used in solution or in polymerized form (paraformaldehyde). Under atmospheric conditions, Formaldehyde is readily photo-oxidized in sunlight to carbon dioxide. It reacts relatively quickly with trace substances and pollutants in the air so that its half-life in urban air, under the influence of sunlight, is short. In the absence of nitrogen dioxide, the half-life of Formaldehyde is approximately 50 minutes during the daytime; in the presence of nitrogen dioxide, this drops to 35 minutes (1).
WHO Regional Office for Europe, Copenhagen, Denmark, 2001 1 Chapter 5.8 Formaldehyde General description Physical and chemical properties Formaldehyde (H2C=O) is a flammable, colourless reactive and readily polymerized gas at normal room temperature and pressure, with a relative molecular mass of 30.03 and a pungent
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