2,4,8,10-tetraoxa-3λ6,9λ6-dithiaspiro[5.5]undecane 3,3,9,9-tetraoxide

Oxidising properties

Link to relevant study record(s)

Reference

Endpoint:

oxidising solids

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.17 (Oxidising Properties (Solids))

GLP compliance:

yes (incl. QA statement)

Specific details on test material used for the study:

Test item: 2,4,8,10-Tetraoxa-3,9-dithiaspiro[5.5]undecane,
3,3,9,9-tetraoxide
CAS No.: 201419-80-9
Lot number: AZ08AVL1
Purity: > 99.9 %
Appearance: crystalline solid, white
Expiration date: 21 September 2021
Storage conditions: room temperature, protected from humidity, well-closed
container

Contact with:

powdered cellulose

Key result

Sample tested:

reference mixture as specified

Parameter:

preliminary test

Remarks on result:

mixture does not ignite and burn

Key result

Sample tested:

reference mixture as specified

Parameter:

maximum burning rate

Remarks on result:

mixture does not ignite and burn

Preliminary Test
The dried test item was thoroughly mixed with the dried cellulose in the proportions 2 of test
item to 1 of cellulose by weight and the mixture was formed into a small cone-shaped pile of
dimensions 3.5 cm (diameter of base) x 2.5 cm (height) by filling, without tamping a coneshaped former.
The pile was placed on a cool, non-combustible, non-porous and low heat-conducting base
plate. The ignition source was put in contact with the cone. The vigour and duration of the
resultant reaction was observed and recorded.

Main Test
Oxidiser cellulose-mixtures containing 10 to 90 % weight of oxidiser in 10 % increments
were prepared.
The pile was formed by means of a mould. The mould was loosely filled with a slight excess
of mixture. After dropping the mould once from a height of 2 cm onto a solid surface, the
remaining excess substance was scraped off with an obliquely positioned sheet. The lateral
limitations were removed and the remaining powder was smoothed. A non-combustible,
non-porous and low heat-conducting base plate was then being placed on top of the mould,
the apparatus inverted and the mould removed.
One end of the pile was ignited by touching with a flame.
The time of reaction was measured over a distance of 200 mm after the reaction zone had
propagated an initial distance of 30 mm.
The test was performed with the reference item and once with each one of the range of
mixtures of the test item with cellulose.

Interpretation of results:

GHS criteria not met

Conclusions:

The test item did not ignite in the Preliminary Test and in the Main Test at any of the mixing ratios. 2,4,8,10-Tetraoxa-3,9-dithiaspiro[5.5]undecane, 3,3,9,9-tetraoxide is not considered
as an oxidising substance.

Executive summary:

his study followed the procedures indicated by the following internationally accepted guideline and recommendation: -Council Regulation (EC) No. 440/2008, Annex, Part A, A.17.: “Oxidising Properties (solids)”, Official Journal of the European Union, L 142, Volume 51, 31 May 2008.

The cone-shaped pile formed during the Preliminary Test could not be ignited therefore the
Main Test was performed.
The test item did not ignite in the Main Test at any of the mixing ratios. 2,4,8,10-Tetraoxa-
3,9-dithiaspiro[5.5]undecane, 3,3,9,9-tetraoxide is not considered as an oxidising substance.

Table 2 Main Test

Ratio Test item : Cellulose	Weight Test item (g)	Weight Cellulose (g)	Burning time (sec)	Burning rate (mm/sec)	Type of burning
10 : 90 %	2.04	18.09	-	-	none, did not ignite
20 : 80 %	4.02	16.06	-	-	none, did not ignite
30 : 70 %	6.06	14.08	-	-	none, did not ignite
40 : 60 %	12.06	18.02	-	-	none, did not ignite
50 : 50 %	10.01	10.06	-	-	none, did not ignite
60 : 40 %	18.08	12.08	-	-	none, did not ignite
70 : 30 %	14.02	6.01	-	-	none, did not ignite
80 : 20 %	16.13	4.04	-	-	none, did not ignite
90 : 10 %	18.08	2.23	-	-	none, did not ignite

Description of key information

The cone-shaped pile formed during the Preliminary Test could not be ignited therefore the Main Test was performed.
The test item did not ignite in the Main Test at any of the mixing ratios. 2,4,8,10-Tetraoxa-3,9-dithiaspiro[5.5]undecane, 3,3,9,9-tetraoxide is not considered as an oxidising substance.

Key value for chemical safety assessment

Oxidising properties:

non oxidising