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EC number: 200-001-8
CAS number: 50-00-0
Pure formaldehyde is a colourless gas,
with a pungent and suffocating odour and has a melting point/freezing
point between -92 °C and -118°C and a boiling point of ≥-21 °C and ≤ -19
°C at 1013.25 hPa. The density of pure formaldehyde is 0.815 g/cm³ at
-20 °C and the relative density of the gas (air = 1.0) is 1.03 – 1.067.
The vapour pressure of pure formaldehyde is ca 5176 - 5186 hPa at 25°C.
As a gas, formaldehyde is extremely flammable, because it is ignitable
in a mixture of 7 - 73 % by volume in air. The self-ignition temperature
is reported to be 395 °C for the pure substance. The log Pow is 0.35.
The water solubility is reported to be 550 g/L, such that concentrations
of up to 55% can be reached in aqueous solutions. Based on the chemical
structure of formaldehyde, no surface activity is predicted. In
addition, formaldehyde is non explosive and incapable of reacting
exothermically with combustible materials. Based
on chemical structure pyrophoric properties and flammability in contact
with water are not to be expected.
Formaldehyde in aqueous solution (37
to 50 %) is a colorless liquid (at 20 °C and 1013 hPa) with a pungent
odour. Cloudiness or opalescence in the formaldehyde solution is caused
by polymer precipitation. An aqueous solution of 30.19 % formaldehyde
has a melting point/freezing point of -18.8 °C and a boiling point of
98.9 - 99.4 °C at 1013.25 hPa. The density of aqueous formaldehyde
solutions is 1.069-1.12 g/cm3 at 20 °C depending on the concentration.
The vapour pressure of a 55% aqueous solution is 14 hPa at 20 °C and 92
hPa at 50 °C
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.
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