In About Chemicals

Other Chemical Names: Oxymethylene, Formic Aldehyde, Methylaldehyde


  • Formaldehyde is found in both liquid and gaseous forms.
  • Primarily, it is a gas that remains in the air. A solution of 37% to 50% can be prepared in liquid form, known as formalin.
  • Formalin contains approximately 15% methanol.

Gas Properties:

  • It has a sharp, pungent odor.
  • Vapor Density: 1.08
  • Boiling Point: -19°C
  • Freezing Point: -118°C
  • Autoignition Temperature: 430°C


  • Soluble in water and also in alcohol.

Formalin Properties:

  • 37% solution containing 15% methanol.
  • Boiling Point: 96°C
  • Flash Point without methanol: 50°C
  • Boiling Point: 101°C
  • Flash Point: 85°C
  • Relative Density: 1.08


  • Formaldehyde is prepared by the oxidation of synthetic methanol.
  • It can also be prepared by the oxidation of low-temperature gases such as propane and butane.
  • Silver, copper, and molybdenum are notable catalysts that play an important role in the oxidation process.


  • Liquid formalin in concentrations of  37%, 40%, 44%, and 50%.


  • Inhalation of this gas can be lethal.
  • Formaldehyde is flammable in aqueous form always avoid it vapors and ensure skin protection.


  • Used in various product manufacturing processes.
  • Preparation of urea and melamine resins.
  • Used in the production of phenolic resins and ethylene glycol.
  • Serves as a hardening agent.
  • Employed in dye-making.
  • Acts as a reducing agent.
  • Used in the manufacturing of various disinfectant products.
  • Applied in textile fabrics.
  • Utilized in various adhesive formulations as well in coating industry.
  • Employed in the cosmetics industry.
  • Importantly, used as a preservative agent.
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