Disodium 4,5-dihydroxybenzene-1,3-disulphonate

Auto flammability

Administrative data

Endpoint:

relative self-ignition temperature (solids)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

19 - 20 Apr 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2017

Report date:

2017

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

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

Deviations:

yes

Remarks:

heating rate was 0.56 K/min vs. 0.5 K/min; this minimal deviation is not critical.

GLP compliance:

yes

Remarks:

Landesamt für Umwelt, Wasserwirtschaft und Gewerbeaufsicht, Kirrweiler, Germany

Test material

Test material information

Constituent 1

Reference substance name:

Disodium 4,5-dihydroxybenzene-1,3-disulphonate

EC Number:

205-741-5

EC Name:

Disodium 4,5-dihydroxybenzene-1,3-disulphonate

Cas Number:

149-45-1

Molecular formula:

C6H6O8S2.2Na

IUPAC Name:

disodium 4,5-dihydroxybenzene-1,3-disulphonate

Results and discussion

Relative self-ignition temperature (solids)

Key result

Relative self-ignition temperature:

352.4 °C

Any other information on results incl. tables

Results Summary

At the temperature 352.4°C an increase in the temperature of the sample in comparison to that of the oven could be detected; also signs of ignition could be observed. The test item AF-378 is considered as auto-flammable at 352.4 °C under the test conditions. After the test was finished, the test item was completely carbonized.

Temperature Data

The temperatures which were measured in the experiment are presented in the following table. As more than 118 values were recorded, only the values every 60 minutes (until the oven had reached the chosen temperature) are presented.

Time in min	Temperature (oven) in °C	Temperature (test item) in °C
5	22.7	20.6
60	48.7	36.7
120	83.6	70.0
180	118.2	105.6
240	154.0	140.5
300	190.4	165.7
360	222.8	199.3
420	257.7	238.0
480	292.0	273.9
540	323.3	307.5
592	352.4	400.0

After the oven reached the temperature of 352.4 °C an ignition was detected and the test was stopped automatically. After test ending the test item was completely carbonized. The heating rate was 0.56 °C/min.

 

Deviations from the Study Plan and the Guideline

The following deviation from study plan and guideline EU method A.16 was stated:

The heating rate of the oven over the complete heating range was 0.56 K/min. instead of

0.5 K/min. This was considered as uncritical as the deviation is minimal.

The deviation was assessed and signed by the study director on 06 July 2017.