Xenon gas is safely kept in metal containers or normal sealed glass at standard pressure and temperature. However, xenon dissolves readily in rubber and most plastics, and will gradually escape from a container, which is sealed with such materials. Xenon is said to be non-toxic, although it dissolves in blood and belongs to a select substance’s group that penetrate the blood-brain barrier, causing from mild to full surgical anaesthesia when inhaled in excess amounts with oxygen.