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EC number: 231-824-0 | CAS number: 7757-87-1
- 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:
- migrated information: read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Study period:
- Testing was conducted between 30 September 2009 and 30 October 2009.
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: see 'Remark'
- Remarks:
- Study conducted in compliance with agreed protocols, with no deviations from standard test guidelines (EU Method A.1). The substance tested is a hydrated form of the substance to be registered and therefore in accordance with 'Data Submission Manual, Part 18 - How to report substance identity in IUCLID 5 for registration under REACH' the hydrated form is considered to be different to the anhydrous form. Read-across from trimagnesium phosphate-4-hydrate to the anhydrous trimagnesium bis(orthophosphate) is justified on the basis that the addition of water is unlikely to detrimentally affect the physicochemical or (eco)toxicological profile of the substance. The reliability has been amended in accordance with 'practical guide 6: How to report read-across and categories' which states that the maximum reliability for a read-across study is 2. The study is considered to be adequate and reliable for the purpose of registration under REACH (Regulation (EC) No. 1907/2006).
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- Date of GLP inspection: 15 September 2009 Date of Signature on GLP certificate: 26 November 2009
- Type of method:
- thermal analysis
- Remarks:
- Differential scanning calorimetry (DSC)
- Melting / freezing pt.:
- > 723 K
- Remarks on result:
- other: .
- Conclusions:
- The test material was determined to have a melting temperature greater than 450°C. Although the test material was identified as undergoing loss of volatiles at approximately 458 K, this thermal event was not associated with a phase transition (i.e. melting) of the test material.
- Executive summary:
Method
The determination was carried out by differential scanning calorimetry (DSC) using the procedure specified in ASTM E537-86, Method A1 Melting/Freezing Temperature ofCommissionRegulation (EC) No 440/2008 of 30 May 2008.
Conclusion
The test material was determined to have a melting temperature greater than 723 K. Although the test material was identified as undergoing loss of volatiles at approximately 458 K, this thermal event was not associated with a phase transition (i.e. melting) of the test material.
Reference
Results
Definitive test
Thermal analysis data for Determinations 1 and 2 are shown in the following tables, respectively.
Table 3 Thermographic Data – Determination 1
Thermal Event |
Interpretation |
Temperature |
|
ºC |
K |
||
Endotherm |
Loss of volatiles |
185.35 |
459 |
Table 4 Thermographic Data – Determination 2
Thermal Event |
Interpretation |
Temperature |
|
ºC |
K |
||
Endotherm |
Loss of volatiles |
184.44 |
458 |
Thermograms are presented as an attachment.
Discussion
Identical thermographic profiles were obtained for the definitive test under both air and nitrogen atmospheres. However, as possible loss of volatiles was to be investigated by a cyclic heating program, nitrogen was used as the furnace atmosphere for the additional test determination as it would ensure the absence of ambient moisture which could have been reabsorbed by the sample on cooling.
For the additional test determination, the presence of the first endotherm during heating step 1, but its absence during reheating of the sample confirmed that this endothermic event was attributable to loss of volatiles. Additionally, the unchanged residue appearance confirmed that the thermal event did not originate from a phase transition (e.g. melting) of the test material.
Description of key information
Melting point: > 450 °C (EU Method A.1, OECD 102, GLP)
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 450 °C
Additional information
The melting/freezing temperature of trimagnesium bis(orthophosphate) was determined by differential scanning calorimetry (DSC) in a study conducted according to EU Method A.1 and GLP. The melting point of the test material was determined to be greater than 450 °C.
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