Registration Dossier
Registration Dossier
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The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
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EC number: 207-079-2 | CAS number: 431-89-0
Density
Administrative data
Link to relevant study record(s)
Description of key information
In accordance with column 2 of REACH Annex VII, a relative density study (section 7.4) does not need to be conducted as the substance is a gas. An estimation based on calculation shall be made from molecular weight and the Ideal Gas Laws, ρ = m/V. As 1 mol of gas at normal conditions has the volume of 22.4 l and MW = 170.03, ρ = m/V = 170.03/22.4 l = 7.59 g/l = 0.0076 g/cm3. The density of air can then be calculated in the same way: ρ = m/V = 29/22.4 l = 1.29 g/l = 0.0013 g/cm3. The relative density of 1,1,1,2,3,3,3-heptafluoropropane with respect to air is then 0.0076/0.0013 = 5.8.
Nevertheless, data are available which indicate that the substance has a density of 1.41 mg/cm3 at 25 ºC. Based on the value and the temperature, it is presumed that these data refer to the liquefied substance.
Key value for chemical safety assessment
Additional information
The value published in a peer-reviewed handbook, mentioned in REACH guidance on information requirements and chemical safety assessment, Chapter R.7.1.1.2, is likely to refer to the liquified substance.
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.
