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Description of key information

The structure of Green liquor sludge and its known constituents do not indicate the presence of highly reactive or unstable groups. The known structure does not indicate that Green liquor presents a danger of explosion when submitted to the effect of a flame or shock under the conditions of the test as described in Test Guideline A.14 of EC Regulation No 440/2008. Screening level calorimetric laboratory study (DSC) confirmed this issue for one tested sample.

Key value for chemical safety assessment

Explosiveness:
non explosive

Additional information

The chemical structure of GLS and its known constituents do not indicate the presence of highly reactive or unstable groups. The known structure does not indicate that GLS presents a danger of explosion when submitted to the effect of thermal or mechanical sensitivity under the conditions of the test as described in Test Guideline A.14 of EC Regulation No 440/2008.

Green liquor sludge is always manufactured as a paste like alkaline inorganic substance. None of the known constituents, in wet or dry form, is classifiable as explosive according to C&L rules (Directive 67/548/EEC and CLP Regulation (EC 1272/2008) or presents any other danger of explosion. However, it is difficult to determine detailed information on the composition of GLS. Therefore lack of explosive properties can be clarified further by basic experiments.

According to the A.14 guideline, the full test does not need to be conducted if the exothermic decomposition energy of the test substance is less than 500 J/g and the onset of exothermic decomposition is above 500 °C. The exothermic decomposition energy of the test substance was estimated by using Direct Scanning Calorimetry (DSC). The DSC curve of the test substance shows no exothermic peaks with relevant reaction enthalpies between 20 °C and 550 °C. Therefore, according to the test results, explosive properties of Green liquor sludge are unlikely and the substance is not classifiable based on the CLP criteria for explosiveness.

Justification for classification or non-classification

The chemical structure of Green liquor sludge and its known constituents do not indicate the presence of highly reactive or unstable groups. The known structure does not indicate that GLS presents a danger of explosion when submitted to the effect of thermal or mechanical sensitivity under the conditions of the test as described in Test Guideline A.14 of EC Regulation No 440/2008.

Green liquor sludge is always manufactured as a paste like alkaline inorganic substance. None of the known constituents, in wet or dry form, is classifiable as explosive according to C&L rules (Directive 67/548/EEC and CLP Regulation) or presents any other danger of explosion.

According to test information, Green liquor sludge is not classified as explosive, since its tested DSC calorimetric curve shows no exothermic peaks with relevant reaction enthalpies between 20 °C and 550 °C.

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