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EC number: 218-507-2 | CAS number: 2167-23-9
- 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
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 21 January 2000
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- study well documented, meets generally accepted scientific principles, acceptable for assessment
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Method 1:
In the first method, the DSC (differential scanning calorimeter) is applied. The pressure is measured accurately with an electronic micro membrane manometer. The vacuum DSC experiments were carried out at various controlled pressure levels.
Approximately 15 mg is weighed into a 70 micro litre aluminium cup with a pierced lid.
After reaching a constant pressure, the DSC temperature scan is started. The heating rate is 5°C/min. During this scan, the product will evaporate. A sudden increase in the endothermic heat flow is then obtained. This represents the initial boiling point of the mixture at the pre-set pressure. A condenser, cooled by CO2ice extrudates, captures the gases. After at least 4 DSC scans at different pressures, a plot is constructed with10log p (p: mbara) versus T(K), the Antoine plot of the product.
Method 2:
In the second method, a closed system is created. The headspace temperature of the system is set at the same value as the sample temperature. The system is equipped with a turbo molecular vacuum pump. This pump is additional to the 2-stage oil vacuum pump and is applied to give extra low initial pressure values. This pump is positioned in the line between the first pump and the flask.
Approximately 5 ml product is put into a clean, dry 500-ml flask. The flask is closed and the valve to the vacuum pumps is opened. The 2-stage vacuum pump is started. The dissolved gases are removed. When the substance gasses intensively, the boiling point is already reached. The temperature here, is lower then in the bath. The valve has to be closed and wait for constant temperature.
Again, the valve has to be opened. When the boiling point is reached again, immediately close the valve. If below 0.5 mbara still no boiling point is reached, the turbo molecular vacuum pump is started.
After reaching a constant value (boiling), the valve to the pumps is closed. The initial value p(initial), during the first few seconds, is close to the vapour pressure of the product. After closing the valve, the pressure rises slowly. This is partly the result of a small leakage. The leak-value determined is before, in an empty system and will be used later on for correction.
The decomposition products formed during the experiment will also contribute to the total pressure. - GLP compliance:
- no
- Other quality assurance:
- other: ISO 9001
- Type of method:
- other: DSC method
- Test no.:
- #1
- Temp.:
- 37 °C
- Vapour pressure:
- 300 Pa
- Remarks on result:
- other: vp of Trigonox D-C50
- Test no.:
- #2
- Temp.:
- 72 °C
- Vapour pressure:
- 2 050 Pa
- Remarks on result:
- other: vp of Trigonox D-C50
- Test no.:
- #3
- Temp.:
- 25 °C
- Vapour pressure:
- 140 Pa
- Remarks on result:
- other: extrapolated vp of Trigonox D-C50
- Test no.:
- #4
- Temp.:
- 25 °C
- Vapour pressure:
- 180 Pa
- Remarks on result:
- other: vp of isododecane solvent control
- Key result
- Test no.:
- #5
- Temp.:
- 25 °C
- Vapour pressure:
- 50 Pa
- Remarks on result:
- other: calculated vp of 2,2-di(tert-butylperoxy)butane in Trigonox D-C50
- Conclusions:
- The extrapolated vapor pressure of commercially marketed Trigonox D-C50 at 25 oC is 140 Pa. From this, the vapor pressure of the contained 2,2-di(tert-butylperoxy)butane is calculated as 50 Pa @ 25 oC.
- Executive summary:
The vapor pressure of the contained 2,2-di(tert-butylperoxy)butane is calculated as 50 Pa @ 25 oC.
Reference
Derived Antoine equation for Trigonox D-C50:
log p (mbar) = 8.071-2157.5/(T-25.94) (T in K)
Derived Antoine equation for isododecane solvent control:
log p (mbar) = 7.036-1515.1/(T-74.70) (T in K)
At 25 oC, the vp of Trigonox D-C50 is 140 Pa.
At 25 oC, the vp of the isododecane used is 180 Pa.
As Trigonox D-C50 is 50 % 2,2-di(tert-butylperoxy)butane and 50 % isododecane, the vp of 2,2-di(tert-butylperoxy)butane in the Trigonox D-C50 can be calculated as (140 - 180/2) Pa = 50 Pa
Description of key information
The vapor pressure of the contained 2,2-di(tert-butylperoxy)butane is calculated as 50 Pa @ 25 oC.
Key value for chemical safety assessment
- Vapour pressure:
- 50 Pa
- at the temperature of:
- 25 °C
Additional information
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