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EC number: 244-344-1 | CAS number: 21351-79-1
- 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
Appearance:
Cesium hydroxide monohydrate is a colourless, odourless inorganic solid.
Melting point:
The melting point of cesium hydroxide monohydrate was determined to be 204 °C at 1013.25 hPa.
Boiling point:
No boiling point can be determined prior to decomposition starting at approx. 190 °C
Density:
Using the gas displacement pycnometry method , the density of cesium hydroxide monohydrate was determined to be 3.53 g/cm3 at 20 °C
Particle size distribution:
The particle size distribution of potassium hexadecyl hydrogen phosphate was estimated as averages of three measurements at two test series. The results were as follows: d10: 28.11 um, d50: 213.0 um, d90: 1037 um.
Vapour pressure:
The determination of the vapour pressure of cesium hydroxide monohydrate was performed according to OECD Guideline 104 and EU Method A.4 The vapour pressure of the test item at 20 °C was interpolated from the Antoine equation.It was determined to be < 0.1 hPa (at 20 °C).
Partition coefficient:
In accordance with column 2 of REACH Regulation (EC) No 1907/2006 Annex VII, the test on partition coefficient n-octanol/water (required in REACH Regulation, Annex VII, section 7.8) does not need to be conducted if the substance is inorganic. Cesium hydroxide monohydrate, respectively cesium hydroxide anhydrous is an inorganic compound. Therefore the estimated log Pow is estimated to be ≤0 due to its salt character and good water solubility.
Water Solubility:
The water solubility of cesium hydroxide monohydrate was determined to be greater than 1000 g/L at 20 +/- 0.5 °C. Therefore, the test item is very soluble.
Surface tension:
The determination of the surface tension of an aqueous solution of cesium hydroxide monohydrate was performed according to OECD Guideline 115 and EU Method A.5. The surface tension of the test item was determined in ten measurements. The measurements revealed values of 70.34 to 71.75 mN/m at 20 °C. The surface tension of cesium hydroxide monohydrate was determined as 71.1 mN/m at 20°C.
Flash point:
As cesium hydroxide monohydrate, respectively cesium hydroxide anhydrous is a solid at room temperature, the determination of the flash point is scientifically unjustified and therefore was not performed. Instead, a test on flammability for solids upon contact in air was conducted (see below).
Auto flammability:
Up to about 400 °C no exothermic reaction of the sample was observed.
Flammability:
Because of the result of the preliminary test, cesium hydroxide monohydrate is considered non flammable. No flammability in contact with water and no pyrophoric properties are expected for the test item.
Explosiveness:
As the sample was neither shock sensitive nor thermally or friction sensitive, according to the criteria of the EU Method A.14, cesium hydroxide monohydrate is not representing an explosive hazard and has not to be considered to present a danger of explosion.
Oxidizing properties:
Test on oxidizing properties of cesium hydroxide monohydrate was performed according to the EU Method A.17. With regard to all test results the test item is assessed to have no oxidizing properties.
Stability in organic solvents and identity of relevant degradation products:
In accordance with column 2 REACH Regulation (EC) No 1907/2006 Annex IX section 7.15, the study which examines stability in organic solvents does not need to be conducted as the test substance cesium hydroxide monohydrate, respectively cesium hydroxide anhydrous is an inorganic substance.
Dissociation constant:
The dissociation constant of the test item (at 24 °C) was determined to be 11.6.
Viscosity:
The study which examines viscosity and is required according to REACH Regulation (EC) No 1907/2006 Annex IX section 7.17 does not need to be conducted as the test substance cesium hydroxide monohydrate, respectively cesium hydroxide anhydrous is not a liquid.
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