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General
  • Para formaldehyde, also known as polyoxymethylene, is the condensation product of formaldehyde with a typical chain length of 8 - 100 units.
  • Paraformaldehyde commonly has a slight odor of formaldehyde due to decomposition.
  • Paraformaldehyde is a poly-acetal.

Process

  • Paraformaldehyde forms slowly in formaldehyde solutions (formaline) as a white precipitate, especially if stored in the cold.
  • Formaline actually contains very little monomeric formaldehyde most of it forms short chains of polyformaldehyde.
  • A few percent of methanol is often added as a stabilizer to limit the extent of polymerization.

Report

  • As a formaldehyde releasing agent, paraformaldehyde is a suspected carcinogen.
  • The new modification involves immersion in 10% formalin following impregnation in ammoniacal silver nitrate, and the use of a low concentration of 4% paraformaldehyde in the developer.

Application

  • Paraformaldehyde is used as a thermoplastic and is known known as polyoxymethylene plastic.
  • Paraformaldehyde is used as fumigant, disinfectant, and fungicide, and for the preparation of pure formaldehyde.
  • The determination of the acidity of oils by catalytic thermometric titrimetry using paraformaldehyde.

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