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EC number: 202-443-7 | CAS number: 95-71-6
- 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
Boiling point
Administrative data
Link to relevant study record(s)
- Endpoint:
- boiling point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 02.03.2018 - 06.04.2018
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.2 (Boiling Temperature)
- GLP compliance:
- no
- Type of method:
- differential scanning calorimetry
- Key result
- Decomposition:
- yes
- Decomp. temp.:
- >= 240 °C
- Conclusions:
- Methylhydroquinone has no boiling point. Decomposition starts at approx. 240°C.
- Executive summary:
The test item Methylhydroquinone has no boiling point up to its decomposition starting at approx. 240°C as determined by differential scanning calorimetry and capillary method according to Regulation EC No. 440/2008 Method A.2. and OECD Test Guideline 103 (1995).
Reference
Performance of measurements with capillary method
The boiling behavior of the test item was confirmed by measurements with the capillary method:
A small quantity of the test item was filled up to 4 – 5 mm into a capillary and compacted by tapping on the capillary. The capillary and a thermometer were heated in the Büchi melting point apparatus from 120 to 400 °C at a heating rate of 10 K/min. The test item was watched while having been heated. When the test item started to melt or boil, the actual temperature was recorded.
Results
The test item shows an endothermic effect in the temperature range
of 120 – 150 °C, which can be associated with a melting of the test item
(melting point according to the certificate of analysis 127.1 °C). A
second endothermic effect was observed in the temperature range of
230 – 310 °C, which cannot be clearly assigned to a boiling of the test
item. No further thermal effects could be observed up to the maximum
test temperature of 500 °C.
Table: Results of the DSC-measurements
No. |
Sample weight / mg |
Onset of Effect / °C |
Range of effect / °C |
Weight loss / mg |
Atmospheric pressure / hPa |
Remark |
1 |
11.60 |
126.49 |
120 – 150 (endo) |
11.38 |
998.0 |
|
2 |
11.91 |
126.94 |
120 – 150 (endo) |
11.84 |
997.0 |
Due to the fact that the second endothermic effect could not be assigned to a boiling of the test item, due to its decomposition starting at 240 °C (see capillary method), the test item has no boiling point before its decomposition starting at a temperature of approx. 240 °C.
Description of key information
According to Annex VII section 7.3, Column 2 of regulation (EC) 1907/2006, the study does not need to be conducted because the test item Methylhydroquinone decomposes before boiling. Decomposition starts at approx. 240 °C as determined by differential scanning calorimetry and capillary method according to Regulation EC No. 440/2008 Method A.2. and OECD Test Guideline 103 (1995).
CKey value for chemical safety assessment
Additional information
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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