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Physical & Chemical properties

Density

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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.