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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Melting point / freezing point

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Administrative data

Link to relevant study record(s)

Description of key information

Tartaric acid and its salts are solid at 1013 hPa.

The determination of this property was done according to a weight of evidence approach based on available literature references.

The melting point for tartaric acid and its salts ranges, according to literature and experimental data, between 70 and 230 °C.

Key value for chemical safety assessment

Additional information

A collection of the melting point values was performed for tartaric acid and its salts. All found values are listed below.

EC name

Range of melting point (°C)

Interpretation of data

(+)-tartaric acid

168 - 171


(-)-tartaric acid 

168 - 172


(±)-tartaric acid

170 - 206


 mesotartaric acid

140 - 147


 potassium hydrogen tartrate



 potassium sodium tartrate

70 - 100


 calcium tartrate

decomposes at 165.2 +/- 0.3 C°


 sodium hydrogen tartrate



 disodium tartrate



 dipotassium tartrate



Based on melting point values, tartaric acid and its salts are solid at room temperature.