Reaction mass of calcium dihydroxide and calcium peroxide

Oxidising properties

Link to relevant study record(s)

Reference

Endpoint:

oxidising solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

02/05/2018 - 28/05/2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

UN Manual of Tests and Criteria: Test O.1 (Test for oxidizing solids)

Deviations:

no

Qualifier:

according to guideline

Guideline:

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

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Contact with:

powdered cellulose

Duration of test (contact time):

<= 3 min

Key result

Sample tested:

4:1 sample-to-cellulose ratio

Parameter:

mean burning time

Result:

6 s

Key result

Sample tested:

1:1 sample-to-cellulose ratio

Parameter:

mean burning time

Result:

78 s

Sample tested:

reference: 3:2 mixture potassium bromate + cellulose

Parameter:

mean burning time

Result:

16 s

Sample tested:

reference: 2:3 mixture potassium bromate + cellulose

Parameter:

mean burning time

Result:

56 s

Sample tested:

reference: 3:7 mixture potassium bromate + cellulose

Parameter:

mean burning time

Result:

113 s

Table 1. Burning Rates of Potassium Bromate / Cellulose Mixtures

Potassium bromate/cellulose (w/w)	Burning time (s)	Mean burning time (s)
3:7	112	113
	110
	108
	116
	118
2:3	55	56
	51
	59
	57
	56
3:2	16	16
	15
	14
	17
	20

 

Table 2. Burning Rates of Test Item / Cellulose Mixtures

Test item/cellulose (w/w)	Burning time [s]	Mean burning time [s]
4:1	5	6
	6
	5
	7
	6
1:1	93	78
	85
	60
	78
	72

Interpretation of results:

Category 1 (strong oxidising solids) based on GHS criteria

Remarks:

EU criteria.

Conclusions:

Based on the test results, the test item has oxidizing properties and is to be classified as Category 1.

Executive summary:

The determination of the oxidising properties of the test item were carried out in accordance with UN Manual of Tests and Criteria: Test O.1 (Test for oxidizing solids), under GLP. The burning time of 4:1 and 1:1 (w/w) test item-cellulose mixtures was compared to the behaviour of reference material mixtures, i.e. potassium bromate and cellulose in a 3:7, 2:3 and 3:2 (w/w) ratio. Measurements were preformed 5 times per sample at 19ºC. Under test conditions, the mean burning time of a 4:1 test item/cellulose mixture was less than the mean burning time of the 3:2 potassium bromate- cellulose reference mixture. Based on the test results, the test item has oxidizing properties and is to be classified as Category 1 (Division 5.1 in packing group I).

Description of key information

Key study. Method according to UN Manual of Tests and Criteria: Test O.1 (Test for oxidizing solids), GLP study. The test item has oxidizing properties and is to be classified as Category 1 (Division 5.1 in packing group I).

Key value for chemical safety assessment

Oxidising properties:

oxidising

Additional information

Key study. The determination of the oxidising properties of the test item were carried out in accordance with UN Manual of Tests and Criteria: Test O.1 (Test for oxidizing solids), under GLP. The burning time of 4:1 and 1:1 (w/w) test item-cellulose mixtures was compared to the behaviour of reference material mixtures, i.e. potassium bromate and cellulose in a 3:7, 2:3 and 3:2 (w/w) ratio. Measurements were preformed 5 times per sample at 19ºC. Under test conditions, the mean burning time of a 4:1 test item/cellulose mixture was less than the mean burning time of the 3:2 potassium bromate- cellulose reference mixture. Based on the test results, the test item has oxidizing properties and is to be classified as Category 1 (Division 5.1 in packing group I).

Justification for classification or non-classification

Based on the available information, the substance is classified as Oxidising Category 1 according to CLP Regulation (EC) no. 1272/2008.