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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