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Diss Factsheets
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EC number: 200-839-4 | CAS number: 75-10-5
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
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.
-
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.
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.
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