Paraformaldehyde (PFA) is the smallest polyoxymethylene, the polymerization product of formaldehyde with a typical degree of polymerization of 8–100 units. Paraformaldehyde commonly has a slight odor of formaldehyde due to decomposition. Paraformaldehyde is a poly-acetal.
Paraformaldehyde forms slowly in aqueous formaldehyde solutions as a white precipitate, especially if stored in the cold. Formalin actually contains very little monomeric formaldehyde; most of it forms short chains of polyformaldehyde. A small amount of methanol is often added as a stabilizer to limit the extent of polymerization.
|Chemical stability||Stable under recommended storage conditions.|
|Molecular weight||30,03 g/mol|
|UN proper shipping name||ADR/RID: PARAFORMALDEHYDE
|UN Number||ADR/RID: 2213
|PARAFORMALDEHYDE 91%||PARAFORMALDEHYDE 96%|
|Purity||91% -94%||96% (± 1.0%)|
|PH (AQUEOUS SOLN)||9 MAX||9 MAX|
|Melting Point||135 TO 170 DEG C||135 TO 170 DEG C|
|Acidity||0.05% (MAX)||0.05% (MAX)|
|Packaging||Polypropylene woven bags with loose inner polyethylene liner: 50 or 25 kgs. nett.|
|Handling||Use of approved respiratory systems, goggles, gloves & suitable clothing is recommended.|
|* Customise Specification Readly Available upon Request.|
- For manufacturing of Phenolic Urea and Melamine Resins (condensation reactions).
- For production of lon Exchange Resins (chloromethylation reaction).
- Disinfection of the air in rooms.
- Hardening of Glues.
- Manufacture of fluorescent pigments and soluble condensation product for textile auxiliaries, alcoholic solutions commonly known as ‘FORMOCEL’.
- It is used in the manufacture of Phenolic Resins, of Urea, Thiourea and Melamine Formaldehyde Resins (whenever high concentration of formaldehyde is required).
- Paraformaldehyde used in place of formaldehyde aqueous solution for high reactivity and concentrations of aldehyde contents reacted with low water contents.