1.03 (vs air)
<1.45 mmHg ( 25 °C)
120-170 °C (lit.)
sublimation point 150 °C
alcohol and cold water: slightly soluble
ethers, hydrocarbons and carbon tetrachloride: insoluble
0.88 g/mL at 25 °C (lit.)
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UN 2213 4.1 / PGIII
If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.
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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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