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Registration Dossier
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EC number: 203-537-0 | CAS number: 107-96-0
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:
- 2008.11.03
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- Landesamt fuer Umwelt, Wasserwirtschaft und Gewerbeaufsicht, Rheinland-Pfalz, Germany
- Type of method:
- capillary method
- Melting / freezing pt.:
- >= 16.7 - <= 18.1 °C
- Decomposition:
- no
- Remarks on result:
- other: estimated accuracy: +/-0.4°C
- Conclusions:
- The melting range of the test substance 3-mercaptopropionic acid (3-MPA) has been determined to be 16.7 °C to 18.1 °C (289.9 K to 291.3 K) +/- 0.4 °C.
- Executive summary:
The test material 3-mercaptopropionic acid (3-MPA) has been determined to have the melting range: 16.7 °C to 18.1 °C (289.9 K to 291.3 K) +/- 0.4 °C by using capillary method with an aluminium block, in accordance with the OECD Guideline 102 as of 27. July 1995 "Melting Point/Melting Range" and EU-Method A.1 "Melting/Freezing Temperature".
Reference
Two determinations of melting point resulted in the melting ranges: 16.9 °C - 17.9 °C and 16.5 °C - 18.2 °C, mean value was reported as 16.7 °C to 18.1 °C (289.9 K to 291.3 K) +/- 0.4 °C.
Description of key information
Melting range: 16.7 °C to 18.1 °C (289.9 K to 291.3 K) +/- 0.4 °C.
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 17.4 °C
Additional information
Study performed in experimental laboratory (Paulus, 2008, LAUS) dedicated to estimate the melting point of the test material 3 -mercaptopropionic acid (3 -MPA) has been chosen as a key study. The melting range has been determined to be: 16.7 °C to 18.1 °C (289.9 K to 291.3 K) +/- 0.4 °C by using capillary method with an aluminium block (in accordance with the OECD Guideline 102 as of 27. July 1995 "Melting Point/Melting Range" and EU-Method A.1 "Melting/Freezing Temperature").
Two other available supporting studies (Lide, 2000 and Lewis, 1977) report the melting points (16.8 °C and 18 °C) for the 3 -mercaptopropionic acid, which are in the melting range determined in the key study.
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