Rapal 01, Paval, Serox, Argalum

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:

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

GLP compliance:

yes (incl. QA statement)

Specific details on test material used for the study:

The test item was mixed prior to the study by the test facility in equal parts from the following three subsamples:

Subsample 1:
Supplier: Befesa Aluminio S.L
Carreta Luncaha- Asúa 13
48950 Erandio (Vizcaya), Spain
Batch No.: Paval Nov 2020
Appearance: Grey solid
Storage conditions: Ambient temperature (10 °C to 30 °C)
Expiry date: November 19, 2021

Subsample 2:
Supplier: RAFFMETAL SPA
Via Malpaga 82
25070 Casto (BS), Italy
Batch No.: Rapal01 Nov 2020
Appearance: Grey solid
Storage conditions: Ambient temperature (10 °C to 30 °C)
Expiry date: December 16, 2021

Subsample 3:
Supplier: Intals SPA
Via Schievano 7
20100 Milano (MI), Italy
Batch No.: Argalum Dec 2020
Appearance: Grey solid
Storage conditions: Ambient temperature (10 °C to 30 °C)
Expiry date: January 11, 2022

Sample tested:

reference: 3:7 mixture potassium bromate + cellulose

Parameter:

mean burning time

Result:

103 s

Sample tested:

1:1 sample-to-cellulose ratio

Parameter:

mean burning time

Result:

> 300 s

Sample tested:

4:1 sample-to-cellulose ratio

Parameter:

mean burning time

Result:

> 300 s

Preparation test item:

Prior to the test the particle size of the test item was determined by laser diffraction (light scattering) (see IU section 4.5). The test item consisted of approximately 37 % particles < 500 µm. Therefore, the complete test item was ground using a mortar and sieved to <500 µm. The residual moisture of the test item was determined to be 7.8 % after drying at 105 ± 5 °C under vacuum for 119 h. For the test of the oxidizing properties itself the test item was not dried.

Preparation reagent:

The fibrous cellulose was dried at 105 ± 5 °C until the weight was constant.

Preparation reference item:

The potassium bromate was sieved > 0.15 mm and < 0.30 mm and dried at 65 ± 5 °C until the weight was constant.

Main test:

The test for the oxidizing properties was performed at the following ambient conditions:

Temperature: 24 °C

Relative air humidity: 30 %

Five tests were performed on the mixture of the test item with cellulose in the ratios 4:1 and 1:1. The results are shown in the following tables.

Table 1: Burning times of test item/cellulose 4:1

t /s	Reaction
>300	Only a brief occurrence of small flames was observed for these mixtures.
>300
>300
>300
>300

The mean burning time of the mixture of the test item/cellulose 4:1 was >300 s.

Table 2: Burning times of test item/cellulose 1:1

t / s	Reaction
>300	Burning, wire broke after 380 s
>300	Burning, wire broke after 445 s
>300	Burning, wire broke after 420 s
>300	Burning, wire broke after 435 s
>300	Burning, wire broke after 555 s

The mean burning time of the mixture of the test item/cellulose 1:1 was >300 s.

Five tests were performed on the mixture of the reference substance with cellulose in the ratio 3:7. The results are shown in the following table.

Table 3: Burning times of potassium bromate/cellulose mixtures

Mixture	Test 1 t / s	Test 2 t / s	Test 3 t / s	Test 4 t / s	Test 5 t / s	mean burning time / s
3:7	97	114	102	104	100	103

Due to the fact that the mixtures of test item with cellulose (4:1) and (1:1) burned slower than the reference mixture (3:7), it was concluded that the test item had no oxidizing properties.

Interpretation of results:

GHS criteria not met

Conclusions:

The test item 'Aluminium, magnesium and silicon oxides and hydroxides from refinement of aluminium salt slag residues' had no oxidizing properties according to the UN test O.1. The burning rate of the test item mixtures were slower than the burning rate of the 3:7 mixture of the reference item.

Executive summary:

Winkler (2021) is a GLP-compliant study following UN method O1 and can be used as a key study for this endpoint. 'Aluminium, magnesium and silicon oxides and hydroxides from refinement of aluminium salt slag residues' has not to be classified as “oxidizing solid” according division 5.1 of the UN Manual of Tests and Criteria, revision 7 (2019) and according to chapter 2.14 of the CLP regulation and of the GHS regulation, revision 8.

 

 

Description of key information

The test item 'Aluminium, magnesium and silicon oxides and hydroxides from refinement of aluminium salt slag residues' had no oxidizing properties according to the UN test O.1. The burning rate of the test item mixtures were slower than the burning rate of the 3:7 mixture of the reference item.

Key value for chemical safety assessment

Oxidising properties:

non oxidising

Justification for classification or non-classification

The available data on oxidising properties of the substance do not meet the criteria for classification according to Regulation (EC) 1272/2008, and are therefore conclusive but not sufficient for classsifcation.