Paraformaldehyde

Paraformaldehyde is the solid form of liquid formaldehyde, formed by the polymerization of formaldehyde with a typical degree of polymerization of 8-100 units. Since paraformaldehyde is basically a condensed form of formaldehyde, it possesses the same characteristics but with a wider range of applications.

PT. Dover Chemical is the first and only producer of paraformaldehyde in the Southeast Asia region to offer competitive price with a world-class quality product. Manufactured based on the latest technology to give good solubility, homogeneous prilled and low acid content, it is suitable for all ranges of application of paraformaldehyde.

Unlike granular or flake forms of paraformaldehyde, our prilled form of paraformaldehyde has higher quality consistency and higher solubility to meet with your quality requirement and save you processing time.

 


In coating applications, low acid content in paraformaldehyde is important for a greater gloss control and stability. Paraformaldehyde made with very low acid content in a chemical resistant environment can prevent formation of acidic by-products.

In microbiology laboratories, fixation process (immunofluorescence) uses formalin 4% concentration. A blog by researchers mentioned that preparing this solution “fresh” from paraformaldehyde is better than using formalin that has been kept for some time. It is because more methylene glycol is present compared to its dimer and trimer oligomers and such solution of formalin 4% is absent of methanol.

Paraformaldehyde can be used as a substitute of formalin to produce the resinous binding material, which is commonly used together with urea, melamine, phenol, resorcinol, tannin or other reactants in the manufacturing of particle board, fibreboard and plywood.

 

Use of paraformaldehyde in resin production offers many advantages as compared to aqueous formaldehyde:

  1. Higher productivity from existing equipment and less water to be removed from the resin product.
  2. It takes the form of prilled, is stable and very easy to store. Paraformaldehyde storage is less expensive than the storage of formaldehyde solution, which requires expensive tanks and which may need stabilization or be kept warm.
  3. Use of paraformaldehyde is convenient and safe. It avoids pollution arising from the disposal of the distillate obtained in the thermosetting resin production which is contaminated with organic matter.
  4. Paraformaldehyde does not need to be dissolved in water in order to take part in a chemical reaction.
  5. It eliminates the risk of transporting liquid formalin, which is notoriously dangerous. Perfect for small uses straight from the bag.

 

Typical Properties

Color

:

White

Appearance

:

Free Flowing Prilled

Molecular Formula

:

OH-(CH2O)n-H where n=8 to 100 units

Paraformaldehyde Content

:

92% ± 1% / 96% ± 1%

Water Content

:

8% ± 1% / 4% ± 1%

Reactivity

:

2 – 8 min

Mean Particle Size

:

250 – 350 µm

Ash

:

0.01 - 0.05%

Bulk Density

:

650 – 850 kg/m3

Melting Point

:

120 – 175  ̊C

pH

:

4 – 7

Flammability

:

combustible, with flash point (tag open cup) of about 93  ̊C

Vapour Pressure

:

varies with air humidity, being between 23 and 26 mmHg at 25  ̊C


Packaging & Handling

-  Polyethylene bag : 25 KG nett. Other Packaging sizes by request.

- Keep in a dry, cool and well-ventilated place. Provide sufficient air exchange and/or exhaust in work rooms. Paraformaldehyde decomposes to formaldehyde which can build up in a shipping container depending on time and temperature during transit. The level of formaldehyde exposure may be instantaneously high when the shipping container is opened.

 

Storage

Store in locked up. Location of storage should only be accesible to authorised personnel. Separate storage area from work place.

 

By Application

  • Urea-Formaldehyde Resin
  • Phenolic Resin
  • Melamine Resin
  • Fumigation
  • Reagent for organic reactions
  • Coating
  • Pesticide
  • Disinfectant
  • Pharmaceuticals

Ask your Dover Chemical representative for the right solution to help you meet your performance goals in your next project.