1.03 (vs air)
52 mmHg ( 37 °C)
52 mmHg ( 37 °C)
10-15% Methanol as stabilizer (to prevent polymerization)
37 wt. % in H2O
≤0.006 meq/g Titr. acid
1.09 g/mL at 25 °C (lit.)
chloride (Cl-): ≤5 ppm
sulfate (SO42-): ≤0.002%
Fe: ≤5 ppm
heavy metals: ≤5 ppm (by ICP-OES)
suitable for manufacturing use (Laboratory chemicals)
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UN 2209 8 / PGIII
132.8 °F - closed cup
56 °C - closed cup
The storage conditions that a Sigma-Aldrich catalog and label recommend for products are deliberately conservative. For many products, long-term storage at low temperatures will increase the time during which they are expected to remain in specification and therefore are labeled accordingly. Where short-term storage, shipping time frame, or exposure to conditions other than those recommended for long-term storage will not affect product quality, Sigma-Aldrich will ship at ambient temperature. The products sensitive to short-term exposure to conditions other than their recommended long-term storage are shipped on wet or dry ice. Ambient temperature shipping helps to control shipping costs for our customers. At any time, our customers can request wet- or dry-ice shipment, but the special handling is at customer expense if our product history indicates that the product is stable for regular shipment. See Shipping and Storage for more information.
Paraformaldehyde is the polymeric form of formaldehyde. Paraformaldehyde is a solid, and formaldehyde is a gas. Formaldehyde solutions consist of formaldehyde gas dissolved in a solvent of some kind.
If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.
The lot specific COA document can be found by entering the lot number above under the "Documents" section.
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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.
Product No. 252549 is an aqueous solution of formaldehyde with methanol present to prevent polymerization of the formaldehyde to paraformaldehyde. Over time (e.g., if a lot of the methanol evaporates), the solution may precipitate the insoluble paraformaldehyde. To break up that polymer, gentle heating should be sufficient. The polymer form has very low solubility in water.
The methanol serves to slow the formation of paraformaldehyde.
The two products are the same chemically. However, the 252549 is designated as an ACS reagent grade. With this description additional specifications are included.
Formaldehyde in its pure form is a gas. The maximum concentration of formaldehyde in aqueous solution is about 37% by weight. This is equivalent to an approximately 13.3 M solution.
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