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Physical & Chemical properties


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Description of key information

Non explosive

Key value for chemical safety assessment

non explosive

Additional information

The test substance is an aqueous solution in 40 % acetic acid. Basic Yellow 28 acetate is only stable in presence of significant concentrations of free acetic acid; it cannot be isolated as such.

The acetic acid solution does not have explosive properties. To determine, whether the dye structure itself could harbour explosive properties, the explosive properties of Basic Yellow 28 as methyl sulfate were investigated.

Thermal Stability

As a screening method for the determination of explosive properties a differential scanning calorimetry (DSC) under nitrogen was performed.

If the decomposition energy is below 500 J/g a main test for explosive properties is unnecessary.

For the measurement in a closed glass crucible about 13 mg of the test item were used. The test item and the standard material (aluminium oxide) were heated up from ambient to the final temperature (500 °C) at a constant heating rate (3 K/min) in a defined atmosphere (nitrogen).

The quantity of heat absorbed or released was measured and recorded.

A DSC-measurement in a closed glass crucible with the test item showed an endothermal effect in the temperature range of 100 - 155 °C. An exothermal effect was observed in the temperature range of 175 - 260 °C with an energy of 583 J/g.

Explosive Properties

The heat of decomposition was above 500 J/g. Therefore the main test on explosive properties had to be performed.

Mechanical sensitivity (friction) :

No explosion occurred within 6 tests using a pinload of 360 N, only a discoloration of the test item was observed.

Mechanical Sensitivity (shock):

No explosion within 6 tests using a mass of 10 kg falling from a height 0.4 m was observed.

Thermal sensitivity:

The test on thermal sensitivity carried out with a nozzle with a diameter of 2.0 mm showed no explosion. Compared to the nozzle with a diameter of 6.0 mm the venting area of the nozzle with 2.0 mm is smaller by an order of magnitude. Additionally the physical state of the test item excludes the enrichment of high-energy components caused by evaporation of volatile solvents. Due to these

facts an explosion with a nozzle width of 6.0 mm was excluded.

Final Result

The test item has no explosive properties in the sense of the European Commission Regulation (EC) No. 440/2008, Method A.14.

Justification for classification or non-classification