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Auto flammability

Link to relevant study record(s)

Reference

Endpoint:

relative self-ignition temperature (solids)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

15 - 16 Nov 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.16 (Relative Self-Ignition Temperature for Solids)

GLP compliance:

yes (incl. QA statement)

Remarks:

Rheinland-Pfalz Landesamt für Umwelt, Mainz, Germany

Remarks on result:

no self ignition observed under the test conditions

Remarks:

no self-ignition up to 400 °C

Findings
Weight of empty cube: 3.7641 g
Weight of cube + test item: 8.8888 g

 

Temperature data
The temperatures which were measured in the experiment are presented in the following table. As many values were recorded, only the values every 60 minutes and relevant values (until the oven had reached the chosen temperature) are presented.

 

Time [min]	Temperature (test item) [°C]	Temperature (oven) [°C]
0005 Start	21.5	19.3
0060	35.0	46.0
0120	60.6	80.7
0180	90.2	115.2
0240	118.7	152.3
0300	144.4	188.5
0360	169.7	223.5
0420	204.5	258.3
0480	288.0	294.0
0485	378.1	297.2
0490	325.5	300.6
0495	280.4	303.4
0540	285.4	328.5
0600	319.1	362.6
0600	355.2	397.7
0665 End	358.1	400.4

 

After performance of the test, the test item was black and charred.

 

Determination of heating rate
The heating rate was calculated using the following equation:
heating rate = (T2 – T1)/(t2 – t1)

T1 = temperature after 5 minutes in °C

T2 = End temperature in °C

t1 = 5 min

t2 = time at which the end temperature was reached in min

 

Presentation of result heating rate

T1 [°C]	19.3
t1 [min]	5
T2 [°C]	400.4
t2[min]	665
Heating rate [°C/min]	0.5774

 

Results and Discussion

An increase in the temperature of the sample in comparison to that of the oven was detected; also signs of ignition were observed. But the increase was below 400 °C.

Therefore, the test item Reaction mass of potassium sodium phosphotartrate and potassium sodium tartrate and potassium sodium ortho-phosphate (solid substance) is considered asshowing no self-ignition up to 400 °Cunder the test conditions.

No observations were made which might cause doubts concerning the validity of the study outcome.

 

Deviations
Deviations from the Study plan
No deviation from the study plan was ascertained.

Deviations from the Guideline
The following deviation from the guideline was documented:

The heating rate slightly deviated from the value stated in the guideline of 0.5 °C/min

(0.58 °C/min). This is considered as uncritical as a nominal heating rate of 0.5 °C/min was adjusted at the instrument and only a minimal deviation was observed.

Description of key information

no self-ignition observed.

highest temperature tested used as threshold

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:

400 °C