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EC number: 224-580-1 | CAS number: 4418-26-2
- 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:
- 14 Sept to 21 Sept 2016
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- Hess. Ministerium für Umwelt, Energie, Landwirtschaft und Verbraucherschutz, Wiesbaden, Germany
- Type of method:
- differential scanning calorimetry
- Key result
- Melting / freezing pt.:
- > 280 °C
- Atm. press.:
- ca. 1 013 hPa
- Decomposition:
- yes
- Remarks:
- substance decomposes before melting up to approx. 280 °C
- Decomp. temp.:
- >= 280 °C
Reference
Evaluation of the data
The evaluation of the data was performed by the software STARe. As result, a thermogram was obtained in which the heat flow** of the investigated sample is given as a function of the temperature. By integration of the heat flow peaks, the energy of the process was obtained.
If the onset temperatures do not differ more than 0.5 K from their mean value, the mean is used as melting point. If the deviation is greater than 0.5 K, a boiling range is specified (lowest to highest onset temperature).
Due to the fact that mixtures do not have a consistent melting point, the lowest onset temperature is used as the beginning of the melting range.
If the test item decomposes before reaching its melting point, the temperature at the start of the decomposition has to be specified.
Results
The thermogram of the DSC runs PN11868 and PN11879 show in the temperature range of 280 -310 °C a sharp endothermic effect. The test item welled out of the test cell during the test and turned black.
Table: Results of the DSC-measurements
No. |
Sample weight / mg |
Onset of effect / °C |
Range of effect / °C |
Weight loss / mg |
PN11868 |
16.50 |
289.99 |
290 – 310 (endo) |
‘---* |
PN11879 |
7.08 |
288.32 |
280 – 310 (endo) |
3.16 |
* Not determined
The endothermic effect in the temperature range of 280 – 310 °C cannot be clearly assigned to the melting of the test item, since test item welled out of the test cell during the test and turned black. Due to the fact that there are no further exothermal effects afterwards, it can be assumed that the test item decomposes accompanied with a formation of gaseous decomposition products before reaching its melting point. This evaporation is detected as an endothermic effect in the DSC measurements and may overlay the exothermic decomposition. This behavior was also observed in the test in the Grewer oven (see report CSL-16-1457.03, Auto ignition).
Due to this, the test item has no melting point up to its decomposition starting at a temperature of approx. 280 °C.
** = negative heat flow for endothermic processes, positive heat flow for exothermic processes.
Description of key information
The substance dehydroacetic acid sodium salt does not melt up to the decomposition temperature of 280 °C at atmospheric pressure (OECD 102, EU A.1, DSC)
Key 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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