441244 Aldrich


prilled, 95%

Synonym: Polyoxymethylene



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.)


Frequently Asked Questions

Frequently Asked Questions are available for this Product.

Features and Benefits

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


1 kg in poly bottle

3 kg in poly drum


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.

Price and Availability

Laboratory Gloves
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

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. These documents are located on the product detail page under Useful Links & Tools. Click on the following link to search for a Certificate of Analysis. Please click the following link to see the details on our Product Dating Information.
How do I get lot-specific information or a Certificate of Analysis?
A Certificate of Analysis is available by lot number and can be obtained through our Advanced Search Option:
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 or view 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, or search here. 
My question is not addressed here, how can I contact Technical Service for assistance?
Use the option to the right to "Ask a Question" by email of a Technical Service Scientist.
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 differences among the various products is in the form for each product.  P6148 is listed as crystalline, 158127 is listed as powder, 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 powder forms are equivalent in terms on use. The prilled form is 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 from preparing solutions daily to storing 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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Peer-Reviewed Papers


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