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Reference
Endpoint:
auto-ignition temperature (liquids)
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 read-across report attached to IUCLID section 13.
Reason / purpose for cross-reference:
read-across source
Key result
Auto-ignition temperature:
>= 400 °C
Atm. press.:
>= 1 011.4 - <= 1 018.9 hPa
Remarks on result:
other:

Three tests were performed, each in triplicate, varying the amount of lactic acid solution that was introduced into the auto-ignition chamber. The reported auto-ignition temperature is the lowest temperature at which auto-ignition was recorded (rounded).

Results of the preliminary test:

The estimated auto-ignition temperature was 415 °C.

Main test:

The results of the main study on the determination of the auto-ignition temperature of the test substance are given in Table 1.

Ignition of the test substance within 5 minutes after introduction was observed with each sample volume and with each test a minimum auto-ignition temperature was obtained. The maximum deviation between the three values was 20 °C. According to the guidelines, no further testing was required.

The lowest temperature at which ignition of the test substance occurred was 403 °C. This temperature was rounded off to the nearest multiple of 5 °C giving an auto-ignition temperature of the test substance of 400 °C.

Test

Volume [µl]

Auto-ignition temperature [°C]

Ignition delay [s]

Colour of the flame

Minimum auto-ignition temperature [°C]

Test 1

40

430

3

orange

412

 

50

412

5

orange

 

 

70

418

5

orange

 

 

 

 

 

 

 

Test 2

60

410

4

Orange/blue

405

 

80

405

4

Orange/blue

 

 

100

411

5

blue

 

 

 

 

 

 

 

Test 3

45

418

4

orange

403

 

70

403

5

blue

 

 

90

408

4

blue

 

Conclusions:
The auto-ignition temperature of a 93 % aqueous solution of lactic acid was determined to be ≥ 400 °C.
Executive summary:

A commercially available auto-ignition temperatures apparatus was used for the determination of the degree of auto-ignitability of latic acid 93 % aq. The test substance is auto-ignitable with an auto-ignition temperature of 400 °C or greater at a atmospheric pressure (1011.4–1018.9 hPa).

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

The auto-ignition temperature of a 93 % aqueous solution of lactic acid was determined to be ≥ 400 °C.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
400 °C

Additional information

A commercially available auto-ignition temperatures apparatus was used for the determination of the degree of auto-ignitability of lactic acid 93 % aq. The test substance is auto-ignitable with an auto-ignition temperature of 400 °C or greater at a atmospheric pressure (1011.4–1018.9 hPa).

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