Description
Formaldehyde / Formalin
37% HCHO in water, 7-8% methanol added as a stabilizer
HCHO, F.W. 30.03
CAS No. 50-00-0 (as formaldehyde gas)
Shipping: LQ Formaldehyde, solution, flammable, UN1198, 3 (8), PG III
Hazard Summary: Highly toxic by ingestion, inhalation, and skin absorption. Known carcinogen. Strong irritant. LD50 100 mg/kg. TLV 0.3 ppm, PEL 0.75 ppm as formaldehyde gas. Use only in a fume hood.
Shelf Life: 1-3 years. A flaky white precipitate eventually forms in all bottles of formaldehyde. This is paraformaldehyde, a polymer of formaldehyde also known as trioxane. Over time, this does reduce the concentration of formaldehyde in solution. Methanol is added to aqueous formaldehyde solutions to retard polymerization, but the process cannot be prevented.
PRODUCT NOTE: This material was dispensed several years ago, and there is an unusually high amount paraformaldehyde in each bottle as a result of unavoidable polymerization as the product ages. Polymerization naturally decreases the concentration of dissolved formaldehyde gas in solution. As a result, we are clearing out this product at a discount. Paraformaldehyde could be converted into formaldehyde gas, which can in turn be redissolved into solution. This procedure requires specialized equipment and should only be conducted under a fume hood.
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