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Physical & Chemical properties

Flammability

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Description of key information

Based on  molecular structure and/or experience in handling,  it was concluded that the substance is not flammable when coming into contact with an ignition source, with water or with air.

Key value for chemical safety assessment

Flammability:
non flammable

Additional information

JUSTIFICATION FOR WAIVING:

Flammability (solid):

Calcium sulphate and Calcium bis(dihydrogenorthophosphate are the main constituents in SSP. Calcium and Sulphur in Calcium sulphate as well as Calcium and Phosphor in Calcium bis(dihydrogenorthophosphate are in their highest oxidation state. This means that both Calcium sulphate and Calcium bis(dihydrogenorthophosphate are not capable of further reaction with oxygen. As burning means a chemical reaction with oxygen, SSP can be regarded as a non-flammable solid.

Flammability (contact with water):

Calcium sulphate and Calcium bis(dihydrogenorthophosphate are the main constituents in SSP. Calcium and Sulphur in Calcium sulphate as well as Calcium and Phosphor in Calcium bis(dihydrogenorthophosphate are in their highest oxidation state. This means that both Calcium sulphate and Calcium bis(dihydrogenorthophosphate are not capable of reaction with water. Furthermore, Calcium sulphate molecules and Calcium bis(dihydrogenorthophosphate molecules do not contain metals or metalloids. Hence, one of the criteria mentioned in Section 5.3 of UN RTDG/MTC Appendix 6 “Screening procedures” is fulfilled. This means that the classification procedure for substances which may react with water to emit flammable gases need not be applied and SSP can be regarded as a non-flammable solid.

 

Flammability (pyrophoric properties):

Calcium sulphate and Calcium bis(dihydrogenorthophosphate are the main constituents in SSP. Calcium and Sulphur in Calcium sulphate as well as Calcium and Phosphor in Calcium bis(dihydrogenorthophosphate are in their highest oxidation state. This means that both Calcium sulphate and Calcium bis(dihydrogenorthophosphate are not capable of reaction with oxygen or any other atom in the air. It is known from experience in handling that this substance does not ignite spontaneously on coming into contact with air at normal temperatures. Therefore, in accordance with Section 5.2.1 of UN RTDG/MTC Appendix 6 “Screening procedures”, the classification procedure for pyrophoric solids need not be applied and SSP can be regarded as a non-pyrophoric solid.

Flammability (self-heating):

Calcium sulphate and Calcium bis(dihydrogenorthophosphate are the main constituents in SSP. Calcium and Sulphur in Calcium sulphate as well as Calcium and Phosphor in Calcium bis(dihydrogenorthophosphate are in their highest oxidation state. This means that both Calcium sulphate and Calcium bis(dihydrogenorthophosphate are not capable of reaction with oxygen or any other atom in the air.Self-heating is the result of an exothermic reaction with oxygen from the air leading to self-heating and subsequent ignition. As SSP cannot react with oxygen, itcan be regarded as a non-self-heatinge solid.

Justification for classification or non-classification

Based on the available data, no classification according to CLP Regulation (EC) No 1272/2008 for the following hazards:

- Flammable solids

- Pyrophoric solids

- Self-heating substances

- Substances which in contact with water emits flammable gases