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Physical & Chemical properties

Viscosity

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Endpoint:
viscosity
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
supporting study
Justification for type of information:
For details and justification of read-across please refer to the attached report in section 13 of IUCLID.
Reason / purpose for cross-reference:
read-across source
Temp.:
other: 25.0°C
Parameter:
dynamic viscosity (in mPa s)
Value:
36.9
Conclusions:
At 25 °C a lactic acid aqueous solution of 88.6 % w/w has a viscosity of 36.9 centipoise. Viscosity increases with increasing concentration and decreases with increasing temperature.
Executive summary:

At 25 °C a lactic acid aqueous solution of 88.6 % w/w has a viscosity of 36.9 centipoise. Viscosity increases with increasing concentration and decreases with increasing temperature.

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:
viscosity
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
supporting study
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
Temp.:
other: 25.0°C
Parameter:
other: cP
Value:
18.4
Remarks on result:
other: 80 % aqueous solution
Temp.:
other: 40.0
Parameter:
other: cP
Value:
9.4
Remarks on result:
other: 80 % aqueous solution
Temp.:
other: 60.0
Parameter:
other: cP
Value:
4.8
Remarks on result:
other: 80 % aqueous solution
Temp.:
other: 80.0
Parameter:
other: cP
Value:
2.9
Remarks on result:
other: 80 % aqueous solution
Conclusions:
The viscosity of lactic acid 80 % solution is in line with expectations and literature data.
Executive summary:

Viscosity was determined with Übbelohde viscosimeter. An 80 % aqueous solution of lactic acid has a viscosity of 18.4 cP (= 18.4 mPa × s) at 25 °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:
viscosity
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Justification for type of information:
For details and justification of read-across please refer to the attached report in section 13 of IUCLID.
Reason / purpose for cross-reference:
read-across source
Key result
Temp.:
other: 25.0°C
Parameter:
other: cP
Value:
18.4
Remarks on result:
other: 80 % w/w solution of lactic acid

Result: Concentration: 88.6 %. Result: 36.9 mP s at 25 °C

Conclusions:
The value found by PURAC at 80 % and 25 °C matches with the values reported in Holten (75.33 % lactic acid at 25 °C, 13.03 cP and 85.32 % at 25 °C, 28.5 cP). The values of 18.4 cP at 80 % and 25 °C and 36.9 cP at 88.6 % and 25 °C are relevant.
Executive summary:

In a PURAC internal report the viscosity of lactic acid at various concentrations and temperatures is given. Measurement is done by Übbelohde viscosimeter. Temperatures varied between 25 °C and 80 °C, concentrations between 20 and 80 %. An 80 % solution has a viscosity of 18.4 cP at 25 °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.

Description of key information

An 80 % aqueous solution of lactic acid has a viscosity of 18.4 cP (= 18.4 mPa × s) at 25 °C.

Key value for chemical safety assessment

Viscosity:
18.4 mPa · s (dynamic)
at the temperature of:
25 °C

Additional information