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EC number: 229-782-3 | CAS number: 6731-36-8
- 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, according to EU guideline, under the Internal Management system. Certificate of analys is present in the report.
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Version / remarks:
- 2008
- Deviations:
- yes
- Remarks:
- See principles of method if other than guideline
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Version / remarks:
- 1995
- Deviations:
- yes
- Remarks:
- See principles of method if other than guideline
- Qualifier:
- according to guideline
- Guideline:
- other: ASTM E537-07, Standard test method for the thermal stability of chemicals by Differential Scanning Calorimetry, 2007
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- other: ISO 1392, Determination of crystallizing point – General method, 1977
- Deviations:
- no
- 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
- Remarks:
- Internal Management system
- Type of method:
- capillary method
- Remarks:
- after DSC
- Melting / freezing pt.:
- < 29 °C
- Atm. press.:
- 101 325 Pa
- Conclusions:
- The freezing point of di-tert-butyl 3,3,5-trimethylcyclohexylidene diperoxide is below -29°C.
- Executive summary:
The melting/freezing point of Di-tert-butyl 3,3,5-trimethylcyclohexylidene diperoxide was determined according toEC Regulation No 440/2008, Guideline A.1 and according to OECD Guideline 102 , and in accordance with European Chemicals Agency (ECHA), Guidance on information requirements and chemical safety assessment, Chapter R.7a, Endpoint specific guidance, May 2008. The melting/freezing point was determined by using two methods, a thermal analysis method and a method for determination of the freezing temperature.
According to ASTM E537-07, Standard test method for the thermal stability of chemicals by Differential Scanning Calorimetry, 2007:
The freezing point of di-tert-butyl 3,3,5-trimethylcyclohexylidene diperoxide 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 attachment. No heat peak was measured. This means that the substance did not freeze 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/freezing 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 : liquid, clear, viscous
- at -5°C : liquid, a little hazy, viscous
- at -10°C : liquid, a little hazy, viscous
- at -15°C : liquid, a little hazy, viscous
- at -20°C : liquid, a little hazy, very viscous
- at -25°C : liquid, a little hazy, very viscous
- at -29°C : liquid, a little hazy, very viscous
No crystallization or freezing was observed. Also the temperature profile did not show any indication of crystallization or freezing. The hazy appearance was most probably due to some water in the sample. 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 3,3,5-trimethylcyclohexylidene diperoxide is below -29°C.
Description of key information
The freezing point of di-tert-butyl 3,3,5-trimethylcyclohexylidene diperoxide is below -29°C.
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- -29 °C
Additional information
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