Reaction mass of cobalt and copper and iron

Auto flammability

Administrative data

Endpoint:

relative self-ignition temperature (solids)

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: No GLP but other quality assurance

Cross-reference

Reason / purpose for cross-reference:

reference to same study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2010

Materials and methods

Test guideline

Guideline:

other: 5.2.1. Thermogravimetry / differential scanning calorimetry

Principles of method if other than guideline:

The oxidation and melting temperatures are measured using TG/DSC (thermogravimetry/ differential scanning calorimetry) method. This measurement is congruent with 92/69/EEC (A.1, 1.4.4.1 and 1.4.4.2).
The thermogravimetrical (TGA) measurements are determined with the STA 409C, manufactured by Netzsch in 1998 and with the TGA/DSC1, manufactured by Mettler Toledo in 2009. Both analyzers provide also a possibility of differential scanning calorimetry (DSC). Thermogravimetry measures the weight changes that occur when a sample is heated, cooled or held at constant temperature in a defined gas atmosphere using a controlled temperature program. Differential scanning calorimetry is based on the well-proven Boersma or heat flux principle in which the heat flux of a sample and a reference sample are compared. That enables to see endothermic or exothermic reaction in the sample, which occur when sample for example melts, vaporizes or when a chemical reaction occurs in the sample. TGA and DSC measurements are done simultaneously and the temperature range in both equipments is from room temperature to 1600 C. Sample type can be liquid, solid or colloid. The accuracy of temperature is 0.5% within 0.3% reproducibility. The resolution of the balance is 1.0 g /11/. The thermogravimetrical measurements are done both in nitrogen (N2) and air flow into the sample chamber heating the sample up to 1500 °C using heating rate 5 °C/min.

GLP compliance:

no

Remarks:

Other quality assurance

Test material

Test material information

Constituent 1

Reference substance name:

Copper powder

IUPAC Name:

Copper powder

Details on test material:

Copper powder sample AK 0.1 to 0.2 µm, D50= 135 µm; oxygen : 0.3, C <0.01%

Results and discussion

Relative self-ignition temperature (solids)

Remarks on result:

no self ignition observed under the test conditions

Any other information on results incl. tables

During the melting test, the copper powder sample was heated in Al₂O₃crucible using nitrogen atmosphere. The TG/DSC curves of the tests are available. The first endothermic peak appears at 1059^oC. Based on TG/DSC, and mineral composition the studied material has no self-ignition properties.

Applicant's summary and conclusion

Conclusions:

This study is of good quality and demonstrates that the absence of self-ignition

Executive summary:

During the melting test, the copper powder sample was heated in Al₂O₃crucible using nitrogen atmosphere. The TG/DSC curves of the tests are available. Thefirst endothermic peak appears at 1059^oC. Based on TG/DSC, and mineral composition the studied material has no self-ignition properties.