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Physical & Chemical properties

Melting point / freezing point

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Endpoint:
melting point/freezing point
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
weight of evidence
Justification for type of information:
For details and justification of read-across please refer to the read-across report attached to IUCLID section 13.
Reason / purpose for cross-reference:
read-across source
Melting / freezing pt.:
>= 52.7 - <= 52.8 °C
Conclusions:
The melting point of L-lactic acid is 53 °C.
Executive summary:

According to Holten, L-lactic acid has a melting point of 53 °C.

This information is used in a read-across approach in the assessment of the target substance.

For details and justification of read-across please refer to the attached report in section 13 of IUCLID.

Endpoint:
melting point/freezing point
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
weight of evidence
Justification for type of information:
For details and justification of read-across please refer to the read-across report attached to IUCLID section 13.
Reason / purpose for cross-reference:
read-across source
Key result
Melting / freezing pt.:
< -80 °C
Atm. press.:
ca. 1 atm
Remarks on result:
other: VIscous solutions do not solidify
Conclusions:
93 % solutions of lactic acid do not solidify.
Executive summary:

93 % solutions of lactic acid do not solidify.

This information is used in a read-across approach in the assessment of the target substance.

For details and justification of read-across please refer to the attached report in section 13 of IUCLID.

Endpoint:
melting point/freezing point
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
weight of evidence
Justification for type of information:
This information is used in a read-across approach in the assessment of the target substance. For details and justification of read-across please refer to the read-across report attached to IUCLID section 13.
Reason / purpose for cross-reference:
read-across source
Melting / freezing pt.:
53 °C

Table 1: melting point of the mixtures of lactic acid

Melting point of the mixtures of lactic acid 

 Mixtures

 R/S

50 % / 50 %

RS

45 % / 55 % 

RS

40 % / 60 % 

 RS

30 % / 70 %

RS

20 % / 80 % 

 RS

10 % / 90 %

 RS

0 % / 100 %

 Melting point (°C)

18.0 

 22.5

 27.5

 35.0

 41.5

 47.0

 53.0

Conclusions:
Melting point of L-lactic acid = 53 °C
Executive summary:

Chirally pure lactic acid has a melting point of 53 °C. Mixtures of R- and S-lactic acid have a decreased melting point, with a eutectic point at a 50:50 mixture at 18 °C.

This information is used in a read-across approach in the assessment of the target substance. For details and justification of read-across please refer to the read-across report attached to IUCLID section 13.

Endpoint:
melting point/freezing point
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
weight of evidence
Justification for type of information:
This information is used in a read-across approach in the assessment of the target substance. For details and justification of read-across please refer to the read-across report attached to IUCLID section 13.
Reason / purpose for cross-reference:
read-across source
Melting / freezing pt.:
53 °C
Conclusions:
The melting point of L-lactic acid is 53 °C
Executive summary:

The melting point of L-lactic acid has been determined in dependence of the percentage of (R)-lactic acid and (S)-lactic acid in the mixture. The melting point of L-lactic acid has been determined to be 53 °C.

This information is used in a read-across approach in the assessment of the target substance. For details and justification of read-across please refer to the read-across report attached to IUCLID section 13.

Description of key information

Melting point of crystalline lactic acid is 53 °C.

Concentrated aqueous solutions of lactic acid do not solidify.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
53 °C

Additional information

Commercial manufacture of lactic acid does not result in solid (crystalline) material. Lactic acid is produced as an aqueous solution at concentrations of up to 93%. Due to the high viscosity of these solutions they do not solidify upon cooling. Also see additional information under "viscosity".