Exploding plastic bottles: I would like to ask about the demonstration of HCl and Al within a plastic bottle which explodes when the level of hydrogen gas builds up.

Exploding plastic bottles: I would like to ask about the demonstration of HCl and Al within a plastic bottle which explodes when the level of hydrogen gas builds up.
Aluminium powder: I have just purchased some Aluminium powder and the MSDS from the supplier ( Chem supply ) states Non Hazardous and Non dangerous goods.