formaldehyde

formaldehyde

a colourless poisonous irritating gas with a pungent characteristic odour, made by the oxidation of methanol and used as formalin and in the manufacture of synthetic resins. Formula: HCHO

Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Formaldehyde

A gas used widely in production of adhesives, plastics, preservatives, and fabric treatments and commonly emitted by indoor materials that are made with its compounds. It is highly irritating if inhaled and is now listed as a probable human carcinogen.

Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

formaldehyde

[fȯr′mal·də‚hīd]

(organic chemistry)

HCHO The simplest aldehyde; a gas at room temperature, and a poisonous, clear, colorless liquid solution with pungent odor; used to make synthetic resins by reaction with phenols, urea, and melamine, as a chemical intermediate, as an embalming fluid, and as a disinfectant. Also known as formol; methanal; methylene oxide.

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

formaldehyde, methylene oxide

A colorless, pungent, volatile liquid, readily soluble in water, widely used in the manufacture of plastics and resins and as a disinfectant.

McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Formaldehyde

 

(also methanal), CH₂O, the first member of the homologous series of aliphatic aldehydes. A colorless gas with a pungent odor, formaldehyde is freely soluble in water and alcohol. It has a boiling point of – 19°C.

Formaldehyde is prepared commercially by the oxidation of methanol (methyl alcohol) or methane with atmospheric oxygen. Because it polymerizes readily, especially at temperatures up to 100°C, it is stored, transported, and used mainly in the form of Formalin or in the form of solid low-molecular polymers— trioxane and paraformaldehyde.

Formaldehyde is highly reactive. Many of its reactions form the basis of numerous commercial methods for the preparation of important products. For example, on interaction with ammonia, formaldehyde yields urotropine (hexamethylenetetramine); with urea, urea-formaldehyde resins; with melamine, melamine resins; with phenols, phenol-formaldehyde resins; with phenol-sul-fonic and napthalene sulfonic acids, tanning agents; and with ket-ene, beta-propiolactone. Formaldehyde is used in the manufacture of polyvinyl formal, isoprene, pentaerythritol, pharmaceuticals, and dyes. It is also used in the tanning of leather and as a disinfectant and deodorizing agent. The polymerization of formaldehyde yields polyformaldehyde.

Formaldehyde is toxic; its maximum tolerable concentration in the air is 0.001 mg/liter.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.