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Physical & Chemical properties

Boiling point

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boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
comparable to guideline study
equivalent or similar to guideline
OECD Guideline 103 (Boiling point/boiling range)
equivalent or similar to guideline
EU Method A.2 (Boiling Temperature)
GLP compliance:
Instead: DIN EN ISO 9001: 2000 management system certification (incl. certificate), TUEV NORD CERT GmbH, Germany
Type of method:
dynamic method
Boiling pt.:
>= 210 - <= 214 °C
Atm. press.:
ca. 998 hPa
Decomp. temp.:
>= 185 °C
Remarks on result:
other: boiling under decomposition
It is not possible to determine an exact boiling point. Boiling under decomposition was detected at 210-214°C (483-487 K).

Description of key information

Boiling point: 210-214ºC under decomposition;
Decomposition starts at 185ºC.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
185 °C

Additional information

The study performed in experimental laboratory (Dobberstein and Fölsing, 2009, Bruno Bock, RL1) dedicated to estimate the boiling point of the test material 3-mercaptopropionic acid has been chosen as a key study. Direct determination of boiling point by measuring at normal pressure was not possible, because of the decomposition of the test substance, which starts at ca. 185 ºC. The study reports boiling under decomposition at 210 -214 ºC. Attempts of measurement was carried out using a reflux distillation apparatus adapted from the description in OECD testing guidelines 103, dynamic method. Boiling with decomposition at 197 ºC reports also supporting study (Rampy, 1973, Dow).

The studies (Lide, 2000 and Lewis, 1977) report the boling point at the reduced pressure and the other study (Dobberstein and Fölsing, 2009, Bruno Bock, RL2) reports the boiling point from calculation (from Clausius Clapeyron equation, QSAR). Thus study of (Dobberstein and Fölsing, 2009, Bruno Bock, RL1) gives the most ample and most reliable information and serve as a key study.