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EC number: 203-492-7 | CAS number: 107-46-0
- 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
Hexamethyldisiloxane is a liquid at standard temperature and pressure, with a measured melting point of -68.2°C, and a measured boiling point of 100.5°C. It has a measured density of 0.76 g/cm3 at 20°C and moderate kinematic viscosity of 0.65 mm2/s at 25°C. It is highly volatile with a measured vapour pressure of 5500 Pa at 25°C.
The substance is classified as highly flammable on the basis of a measured flash point of -6°C and boiling point of 100.5°C. It has an auto-ignition temperature of 340°C, is not explosive and is not oxidising on the basis of structural examination.
In contact with water, hexamethyldisiloxane reacts slowly, half-life of 116 h (5 days) at pH 7 and 24.8°C according to the following equation:
(CH3)3SiOSi(CH3)3+ H2O → 2(CH3)3SiOH
Hexamethyldisiloxane is slightly soluble in water (water solubility of 0.93 mg/l at 23°C) and has a measured log Kow of 5.06 at 20°C. It does not dissociate in solution nor show significant surface activity.
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