Registration Dossier
Registration Dossier
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EC number: 205-749-9 | CAS number: 149-91-7
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:
- weight of evidence
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- documentation insufficient for assessment
- Principles of method if other than guideline:
- No method detailed
- GLP compliance:
- no
- Type of method:
- other: Not detailed
- Key result
- Melting / freezing pt.:
- 230 - 232 °C
- Conclusions:
- The melting point of gallic acid is 230-232°C.
- Executive summary:
The melting point of gallic acid is 230-232°C.
- Endpoint:
- melting point/freezing point
- Type of information:
- other: Handbook
- Adequacy of study:
- weight of evidence
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
- Principles of method if other than guideline:
- No method detailed
- GLP compliance:
- no
- Type of method:
- other: not detailed
- Key result
- Melting / freezing pt.:
- 253 °C
- Conclusions:
- The melting point of gallic acid is 253°C.
- Executive summary:
The melting point of gallic acid is 253°C.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- documentation insufficient for assessment
- Principles of method if other than guideline:
- No method detailed
- GLP compliance:
- no
- Type of method:
- other: not detailed
- Key result
- Melting / freezing pt.:
- 235 - 238 °C
- Conclusions:
- The melting point of gallic acid is 235-238°C.
- Executive summary:
The melting point of gallic acid is 235-238°C.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- documentation insufficient for assessment
- Principles of method if other than guideline:
- No method detailed
- GLP compliance:
- no
- Type of method:
- other: not detailed
- Key result
- Melting / freezing pt.:
- 254 - 256 °C
- Conclusions:
- The melting point of Gallic acid is 254-256 °C.
- Executive summary:
The melting point of Gallic acid is 254-256 °C.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- comparable to guideline study
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- GLP compliance:
- no
- Type of method:
- differential scanning calorimetry
- Key result
- Decomposition:
- yes
- Decomp. temp.:
- >= 210 - <= 431 °C
- Remarks on result:
- not determinable
- Remarks:
- decomposition of the test item occurs together with melting
- Conclusions:
- No melting point was determined as it occured together with decomposition of the test item, starting at 210°C. No boiling was observed up to 431°C.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- no information but peer-reviewed handbook
- GLP compliance:
- not specified
- Type of method:
- other: not specified
- Key result
- Sublimation:
- yes
- Subl. temp.:
- >= 210 °C
- Remarks on result:
- other:
- Remarks:
- see below
- Conclusions:
- Litterature reports that gallic acid sublimes at 210°C, giving a stable form with melting point 258 to 265°C and an unstable form with melting point 225 to 230°C.
However the method is unknown.
Referenceopen allclose all
The test item is stable up to 74°C when occurs the first mass loss (9.1%) up to 107°C due to dehydration (endothermic peak at 92°C) that correspond to one mol. Above this temperature until 210°C the test item is stable with no mass loss and no endo or exothermal events. The second mass loss (78.8%) occurs between 210-264°C with an endothermic peak (256°C) observed in the DTA curve. Immediately occurs the third mass loss (10.5%) with the oxidation of the organic matter and two corresponding exothermic peaks (at 410 and 431°C), respectively. The final residue of decomposition of the test item was 1.6% of the total initial mass (carbon residue). The melting point was not determined because the it occurs together the second mass loss (between 210-264°C).
No boiling was observed up to 431°C.
Sublimes at 210°C, giving a stable form with melting point 258 to 265°C and an unstable form with melting point 225 to 230°C.
Description of key information
The weight of evidence approach may apply as 6 independent sources of information are available:
A) Zhang et al., 2004
Melting point of gallic acid: 254-256°C
B) Imran et al., 2009
Melting point of gallic acid: 235-238°C
C) Cai & Wu, 1996
Melting point of gallic acid: 230-232°C
D) CRC Handbook, 1971
Melting point of gallic acid: 253°C
E) Alberti et al., 2016
No melting point was determined as it occured together with decomposition of the test item, starting at 210°C. No boiling was observed up to 431°C.
F) Budavari (1996)
Litterature reports that gallic acid sublimes at 210°C, giving a stable form with melting point 258 to 265°C and an unstable form with melting point 225 to 230°C.
However the method is unknown.
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 225 °C
Additional information
A range of melting point of gallic acid of 225 -256°C is provided in 4 independent sources of information.
However, litterature reports that gallic acid can sublime and/or decompose from 210°C.
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