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EC number: 601-472-6 | CAS number: 117314-20-2
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:
- 24.5.-11.9.2014
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Remarks:
- A differential scanning calorimetry method compatible with Method A1 Melting/Freezing Temperature of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 102 of the OECD Guidelines for Testing of Chemicals, 27 July 1995 was used. The study is GLP compliant.
- Reason / purpose for cross-reference:
- reference to other study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- Certificate included in the study report.
- Type of method:
- thermal analysis
- Remarks:
- Differential scanning calorimetry
- Melting / freezing pt.:
- > 450 °C
- Atm. press.:
- 1 atm
- Decomposition:
- yes
- Remarks:
- According to published studies performed by A. Clearfield and J. Lehto (1988), the substance decomposes at 700 °C.
- Decomp. temp.:
- ca. 700 °C
- Conclusions:
- The melting point study determines that the substance does not melt at temperatures below 450 °C. Visually, the samples did not change during the study. In a supporting study by A. Clearfield and J. Lehto (1988) the substance has been found to decompose before melting at very high temperatures (above 700 °C).
- Executive summary:
The melting point was determined using differential scanning calorimetry in accordance with EU Method A.1 and OECD Guideline 102. According to the study, the substance does not melt at temperatures below 450 °C. According to a supporting study by Clearfield and Lehto (1988) the substance has been found to decompose at very high temperatures (above 700 °C) before melting.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 24.5.-11.9.2014
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Remarks:
- A differential scanning calorimetry method compatible with Method A1 Melting/Freezing Temperature of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 102 of the OECD Guidelines for Testing of Chemicals, 27 July 1995 was used. The study is GLP compliant.
- Reason / purpose for cross-reference:
- reference to other study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- Certificate included in the study report.
- Type of method:
- thermal analysis
- Remarks:
- Differential scanning calorimetry
- Melting / freezing pt.:
- > 450 °C
- Atm. press.:
- 1 atm
- Decomposition:
- yes
- Remarks:
- According to published studies performed by A. Clearfield and J. Lehto (1988), the substance decomposes at 700 °C.
- Decomp. temp.:
- ca. 700 °C
- Conclusions:
- The melting point study determines that the substance does not melt at temperatures below 450 °C. Visually, the samples did not change during the study. In a supporting study by A.Clearfield and J. Lehto (1988) the substance has been found to decompose before melting at very high temperatures (above 700 °C).
- Executive summary:
The melting point was determined using differential scanning calorimetry in accordance with EU Method A.1 and OECD Guideline 102.
According to the study, the substance does not melt at temperatures below 450 °C. According to a supporting study by Clearfield and Lehto (1988) the substance has been found to decompose at very high temperatures (above 700 °C) before melting.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- 3 (not reliable)
- Rationale for reliability incl. deficiencies:
- other: see 'Remark'
- Remarks:
- The study published by A. Clearfield and J. Lehto in the Journal of Solid State Chemistry (1988). The study has not been done according to any standard method. However, the study has been recorded in detail. The study was done as a part of J. Lehto's dissertation.
- Reason / purpose for cross-reference:
- reference to other study
- Reason / purpose for cross-reference:
- reference to other study
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- The product was synthesized at the laboratory where the study was performed.
The sodium and titanium content in the products were determined by neuron activation analysis (NAA). X-ray diffraction studies were also used for the analysis. The water content was determined by heating the samples to 700 - 800 Celsius and calculating the water content from the weight loss. Some samples were analysed with TGA for the water loss study. - GLP compliance:
- not specified
- Type of method:
- thermal analysis
- Decomp. temp.:
- > 700 °C
- Conclusions:
- The substance has been shown to decompose before melting at high temperatures. At about 600 °C an unidentified, poorly crystalline phase is formed. The product decomposes at 700 °C to stable trititanate and hexatitanate compounds.
Referenceopen allclose all
No evidence of melting below 450 °C (723 K). The broad endotherms from approximately 40 to 250 °C indicate a gradual loss of a volatile component, most likely water.
No evidence of melting below 450 °C (723 K). The broad endotherms from approximately 40 to 250 °C indicate a gradual loss of a volatile component, most likely water.
Heating sodium titanate, hydrate to 700 °C yielded the following decomposition products (after the loss of water):
Na4Ti9O20 -> Na2Ti3O7 + Na2Ti6O13
Before the above mentioned decomposition, Na4Ti9O20 forms at 600 °C an unidentified, poorly crystalline phase.
Description of key information
Thermal analysis (differential scanning calorimetry (DSC)): Melting point > 450 °C at 1,013 hPa (OECD 102, EU Method A.1, GLP)
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 450 °C
Additional information
The melting point study determined that the substance does not melt at temperatures below 450 °C. Visually, the samples did not change during the study. In a supporting study by Clearfield and Lehto (1988) the substance has been found to decompose before melting at very high temperatures (above 700 °C).
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