441244 Sigma-Aldrich


prilled, 95%

Synonym: Polyoxymethylene

  • CAS Number 30525-89-4

  • Linear Formula HO(CH2O)nH

  • Molecular Weight 30.03 (as monomer)

  •  MDL number MFCD00133991

  •  PubChem Substance ID 24867646

  •  NACRES NA.22



Related Categories Aldehydes, Building Blocks, C1 to C6, Carbonyl Compounds, Chemical Synthesis,
vapor density   1.03 (vs air)
vapor pressure   <1.45 mmHg ( 25 °C)
assay   95%
form   prilled
autoignition temp.   572 °F
expl. lim.   73 %
mp   120-170 °C (lit.)
transition temp   sublimation point 150 °C
solubility   alcohol and cold water: slightly soluble
  ethers, hydrocarbons and carbon tetrachloride: insoluble
density   0.88 g/mL at 25 °C (lit.)



Formaldehyde source to prepare phenol-, urea-, furfuryl alcohol-, resorcinol- and melamine-formaldehyde polymers for use in coatings, wood products, textiles and foundry resins.

Paraformaldehyde may be used in the preparation of azomethine ylide, α-methylenechromanes, α-methylenequinoline and ortho-quinone methides.


1 kg in poly bottle

3 kg in poly drum

Features and Benefits

Source of methanol-free formaldehyde.
Decomposes in hot water to give formaldehyde.

Safety & Documentation

Safety Information

Signal word 
Precautionary statements 
UN 2213 4.1 / PGIII
WGK Germany 
Flash Point(F) 
158 °F
Flash Point(C) 
70 °C


Certificate of Analysis (COA)

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Certificate of Origin (COO)

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Frequently Asked Questions

Which document(s) contains shelf-life or expiration date information for a given product?
If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.
How do I get lot-specific information or a Certificate of Analysis?
The lot specific COA document can be found by entering the lot number above under the "Documents" section.
How do I find price and availability?
There are several ways to find pricing and availability for our products.Once you log onto our website, you will find the price and availability displayed on the product detail page.You can contact any of our Customer Sales and Service offices to receive a quote. USA customers: 1-800-325-3010 orview local office numbers.
What is the Department of Transportation shipping information for this product?
Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product.
What are the differences between the Paraformaldheyde products and which is best suited for use as a fixative for Electron Microscopy?
Product 16005 is sold only in Europe and is not available to US customers.The primary differencesamong the various products is in the form for each product.P6148 is listed as crystalline, 158127 is listedaspowder, and 441244 is listed as prilled.The product information page for 441244 states the prilled form will go into solution more readily, but the prilled, crystalline, and powderforms are equivalent in terms on use. The prilled formis expected to slow down the rate of sublimation compared to the powder or the crystalline forms. Any of the 3 products should be suitable for use as a fixative.However, once prepared, paraformaldehyde solutions are unstable unless methanol is added as a stabilizer. Customer options vary frompreparingsolutions daily tostoring solutions for 2 or 3 weeks.If used as a fixative for electron microscopy, we recommend preparing solutions fresh daily to avoid the risk of repeating tedious EM work due to deterioration of the fixative.For less critical applications, it would be more acceptable to use solutions stored for longer periods of time.
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