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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
Based on its physico-chemical properties and according to distribution modelling, when released to the environment, the majority of difluoromethane will partition into the air compartment (99.99%). It will then degrade in the lower atmosphere by reaction with hydroxyl radicals to yield C(=O)F2 as an intermediate product, which will be further converted to HF and CO2 by hydrolysis in atmospheric water. The calculated atmospheric lifetime of difluoromethane is 4.9 years corresponding to a 1/2-lifetime of 3.39 years (WMO, 2002).
Due to its structure without chlorine or bromine, difluoromethane is not expected to have an impact on the stratospheric ozone layer (ODP = 0). Because of its low reactivity with OH, difluoromethane is not expected to contribute significantly to the formation of ground ozone (POCP = 0.2). Its Global warming potential is 675. Its contribution to the greenhouse effect can be considered as small (IPCC 4th Assessment Report).
In water, difluoromethane is not dissociated and not expected to hydrolyse owing to the lack of hydrolysable functional group in its chemical structure. It is not readily biodegradable under aerobic conditions (about 5 % of biodegradation after 28 days) and is not expected to sorb significantly to soil and sediment. Difluoromethane has a low potential to bioaccumulate in aquatic species based on a measured log Kow of 0.21.
Difluoromethane, when released to the environment, will partition almost exclusively into the ambient air; it has little tendency to partition to aquatic or terrestrial compartments. Because of its moderate sorption affinity, difluoromethane is expected to be mobile in soil. The most significant degradation process occurs in the atmospheric compartment.
Additional information
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.