(R)-lactic acid

Auto flammability

Link to relevant study record(s)

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).