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EC number: 203-733-6 | CAS number: 110-05-4
- 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
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- September 2009 – March 2010
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Well conducted study, performed under the Internal Management System. Certificate of analysis included in the report.
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Deviations:
- yes
- Remarks:
- See Principles of method if other than guideline
- Principles of method if other than guideline:
- The crystallizing tube is not put into an outer protection tube.
- A 20 mm magnetic driven Teflon coated steel bar is used as stirrer instead of a mechanically driven stirrer with a loop of 20 mm.
- The temperature in the substance and in the cooling bath is measured with thermocouples instead of thermometers.
- A 500 ml insulating cooling bath made of glass and containing ethanol as cooling liquid is used for cooling the substance instead of a Dewar vessel. The bath is continuously stirred with a magnetic stirrer and its temperature is controlled via an external thermostatted
bath.
- The substance is cooled down in steps of 5°C to below -25°C or until crystallization occurs, instead of a one-step cooling to a temperature of 3 to 5°C below the expected crystallizing point.
It is not expected that these deviations will have affected the outcome of the study. - GLP compliance:
- no
- Type of method:
- method to determine freezing temperature
- Remarks:
- After Thermal analysis
- Melting / freezing pt.:
- < -29 °C
- Conclusions:
- Di-tert-butyl peroxide has a freezing point lower than -29°C.
- Executive summary:
The freezing point of di-tert-butyl peroxide was determined according to OECD guideline 102. Two methods were used for the determination of the melting/freezing point, a thermal analysis method (Differential Scanning Calorimetry, DSC) and a method for the determination of the freezing temperature. The first method is based on ASTM E537-07 and the second on ISO 1392. Both methods are mentioned in the list of standards of Guidelines EC A.1 and OECD 102.
No crystallization or freezing was observed. Also the temperature profile did not show any indication of crystallization or freezing. Since the substance remained liquid in the temperature range from 0°C to -29°C, it can be concluded that the melting/freezing point of di-tert-butyl peroxide is below -29°C.
Reference
Accuracy check DSC
The measured values for Indium are mentioned below.
- onset temperature : 156.48°C
- enthalpy of melting : 28.55 J/g
The measured values are within the acceptance limits.
Test method 1:
Thermal analysis method
The DSC curve of the measurement is shown in the report. No heat peak was measured. This means that the substance did not solidify or crystallize during the cooling step to -50°C, and consequently did neither melt during the heating step back to 20°C. This means that the melting point could not be determined with this method.
Test method 2:
Method for determination of the freezing temperature
Cooling was done in seven steps from 0°C to -29°C.
The appearance of the sample at each temperature level is mentioned below.
- at 0°C : clear liquid, thin fluid
- at -5°C : clear liquid, thin fluid
- at -10°C : clear liquid, thin fluid
- at -15°C : clear liquid, thin fluid
- at -20°C : clear liquid, thin fluid
- at -25°C : clear liquid, thin fluid
- at -29°C : clear liquid, thin fluid
Description of key information
Di-tert-butyl peroxide has a freezing point lower than -29°C.
Key value for chemical safety assessment
Additional information
This data is supported by one old report and five literature endpoints.
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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