Registration Dossier
Registration Dossier
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 200-001-8 | CAS number: 50-00-0
Density
Administrative data
Link to relevant study record(s)
Description of key information
The density of pure formaldehyde is 0.815 g/cm³ at -20 °C
The vapor density of pure formaldehyde is ca 1.03-1.067 ( gas at 20 °C, air = 1)
The density of aqueous formaldehyde solutions is 1.069-1.12 g/cm3 at 20 °C (depending on concentration)
Key value for chemical safety assessment
Additional information
Eight published handbooks and/or authoritative online data bases were identified containing information on the density of pure formaldehyde.
According to the CRC (2010) and SYKE
(2015), the density of formaldehyde is 0.815 g/cm³ at -20 °C
The Merck Index, and Hawleys (2012) report this value as relative
density 0.815 at -20/4 °C
Ullmanns (2010), RömppChemie (2015) and Reaxys (2015) report 0.8153
g/cm³ at -20 °C and 0.9172 g/cm³ at -80 °C
Verschueren (2001) reports a relative density of 0.81 (-20/4).
Based on these data the density of pure formaldehyde is determined to be 0.815 g/cm³ at -20 °C.
Vapor density of pure formaldehyde
Six published handbooks and/or authoritative online data bases also contained the vapor density of pure formaldehyde. The following values were identified:
Verschueren (2001), and Syke (2015), report a vapor density of 1.03 (air =1).
Chemsafe reports a vapor density of 1.037 (air =1).
The Merck Index, RömppChemie (2015) and Hawleys (2012) published a vapor density of 1.067 (air = 1)
Based on these data the relative density of pure formaldehyde is determined to be ca 1.03-1.067 ( gas at 20 °C, air = 1)
Density of aqueous formaldehyde solutions Four sources were identified concerning the density of aqueous formaldehyde solutions. According to a study form BASF (1987, Key) the density of solutions containing ca 30 to 40 % formaldehyde is 1.069 - 1.12 g/cm³ (20°C). These results are supported by Walker (1967) in which the density of solutions containing 37.5 %, 45 %, and 50 % formaldehyde and 1 % methanol are reported to be 1.113 g/cm³, 1.135 g/cm³ and 1.15 g/cm³ respectively (18 °C). In addition the Merck index (2013) reports a density of 1.09 g/cm³ for a ca. 37% (wt) formaldehyde solution and the EPA (2008) reregistration publication a density of and 1.048 g/cm³ as well as a relative density of 1.08.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
