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Physical & Chemical properties

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Link to relevant study record(s)

Reference
Endpoint:
relative self-ignition temperature (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:
other: UN Test N.4 Self-heating substances
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
Remarks on result:
no self ignition observed under the test conditions

6.7 g of the test item were placed into the wire-basket.


The temperature of the test item followed behind the oven temperature starting at an oven temperature of approx. 20 °C. At an oven temperature of approx. 40 °C an endothermal effect started. A second endothermal effect was observed at an oven temperature of approx. 220 °C. No exothermal effect was observed up to a temperature of approx. 470 °C. After the test the test item appeared visually unchanged.


 


As no self-ignition temperature was observed up to 470 °C (final oven temperature) further testing is not necessary.

Conclusions:
As the Grewer oven test indicated no self-ignition up to 470 °C the test item had not to be classified as “self-heating substance” in the sense of UN Manual of Tests and Criteria, Method N.4., and had not to be classified as “self-heating substance” according to chapter 2.11 of the GHS (CLP) regulations.
Executive summary:

Winkler (2021) is a GLP-compliant study following UN method N4 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' had not to be classified as “self-heating substance” in the sense of UN Manual of Tests and Criteria, Method N.4., and had not to be classified as “self-heating substance” according to chapter 2.11 of the GHS (CLP) regulations.


 

 

Description of key information

not self-heating

Key value for chemical safety assessment

Additional information

'Aluminium, magnesium and silicon oxides and hydroxides from refinement of aluminium salt slag residues' had not to be classified as “self-heating substance” as a Grewer oven test indicated no self-ignition up to 470 °C of the test item.