Registration Dossier

Administrative data

Link to relevant study record(s)

Description of key information

A full A.14 (Explosive Properties) study on anhydrous NaDCC.  The substance has the potential to present an explosion hazard under certain conditions because of the limiting diameter of 2.0 mm established by the steel cartridge method.  

Key value for chemical safety assessment

Explosiveness:
explosive

Additional information

The active substance has the potential to present an explosion hazard under certain conditions because of the limiting diameter of 2.0 mm established by the steel cartridge method. Heating above the decomposition point (about 236°C) releases a large quantity of hot gases which may cause an explosion if confined in a tightly sealed container. Thus, anhydrous NaDCC failed the thermal sensitivity portion of the A.14 test.

 

There was some decomposition but no detonation of anhydrous NaDCC upon impact at 25 J or more. There was no decomposition or detonation during the friction test. Anhydrous NaDCC also proved to be insensitive to the stress of a detonation. Thus, anhydrous NaDCC was not explosive by friction, impact or shock and passed the friction and impact portions of the A.14 test.  

Justification for classification or non-classification

As a result of the A14 tests, the 30thATP to the DPD classifies NaDCC anhydrous as explosive. 

However this explosivity classification does not translate directly under the CLP classification criteria. The proposed classification for NaDCC anhydrous for CLP is: H272 May intensify fire; oxidizer based on the oxidizing study (Smeykal, 2007 section 4.15)

However, anhydrous NaDCC should not be classified as an explosive when packaged in plastic containers, fibre drums or bulk bags since these containers are not pressure tight and are not able to contain a large pressure. Furthermore, if these containers are present in a fire situation, they will burn through before the product inside the container will be heated to the decomposition point.

 

Metal containers, such as steel drums or cans, are generally not suitable for anhydrous NaDCC or NaDCC dihydrate, since metal containers are pressure tight and could present an explosion hazard if heated. However, neither anhydrous NaDCC or NaDCC dihydrate are packaged in metal containers due to the corrosive properties of these products. Plastic containers, fibre drums and bulk bags are much more suitable for these products, and are less expensive, than metal drums.