Registration Dossier
Registration Dossier
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EC number: 200-839-4 | CAS number: 75-10-5
Endpoint summary
Administrative data
Description of key information
Additional information
- Difluoromethane is a colourless,odourless gas with a melting point of -136ºCand a boiling point of -51.6ºC(Lange's Handbook of chemistry, 1999).
- In accordance with column 2 of REACH Annex VII or with column 1 of REACH Annex IX and/or the REACH guidance on information requirements and chemical safety assessment (chapter R7.A), testing on particle size and viscosity is not needed as the substance is a gas. Testing on the stability in organic solvents and the identity of relevant degradation products is not required as it is not considered to be critical.
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In accordance with column 2 of REACH Annex VII, a relative
density study 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, ¿ = m/V. Thus ¿ = 2.32 g/l = 0.0023
g/cm3 at 0°C and = 0.0021 g/cm3 at 25°C.
A peer reviewed handbook gives a density of vapours of 2.98kg/m3 at -57.1°C and a density of the liquefied gas of 959 kg/m3 at 25°C.
- The vapour pressure of difluoromethane is 11.19 bar at 283.32 K and 17.01 at 298.15 K (or 1701 kPa at 25°C)(Jongcheon 1996).
- Based on its structure, difluoromethane is not expected to be surface active.
- The octanol/water partition coefficient (log Pow) is 0.21 at 25°C(Kurume Research Laboratories, 1992). Consequently the substance as a very low potential for adsorption and bioaccumulation. The water solubility is >1680 mg/l at 25ºC(Arkema, 2005), and the substance remains undissociated in water (Kurume Research Laboratories, 1992). So, the substance can be considered as stable and soluble in water.
- A study on the flash point is not required as the substance is a gas at room temperature. The self-ignition temperature is 530ºC at 1018 hPa (Ineris, 1995). As the lower and upper flammability limits are 13% and 33%, respectively (Dekleva, 1993), difluoromethane has to be classified as extremely flammable (F+, R12 according to EU Directive 67/548/EEC and H220 according to EU Classification, Labelling and Packaging of Substances and Mixtures (CLP) Regulation (EC) No. 1272/20008). As a result, the substance does not need to be tested for oxidising properties. As the substance is a gas, testing on explosiveness is not required.
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