 Xenon gas can be safely kept in normal sealed glass or metal containers at standard temperature and pressure . However , it readily dissolves in most plastics and rubber , and will gradually escape from a container sealed with such materials . Xenon is non @-@ toxic , although it does dissolve in blood and belongs to a select group of substances that penetrate the blood – brain barrier , causing mild to full surgical anesthesia when inhaled in high concentrations with oxygen . 
 Xenon gas can be safely kept in normal sealed glass or metal containers at standard temperature and pressure . However , it readily <a href='uninflect' title='1'><mark>dissolves</mark></a> in most plastics and rubber , and will gradually escape from a container sealed with such materials . Xenon <a href='drop_aux' title='2'><mark>is</mark></a>non @-@ toxic , although it <a href='uninflect' title='3'><mark>does</mark></a> dissolve in blood and <a href='uninflect' title='4'><mark>belongs</mark></a> to a select group of substances <a href='null_relcl' title='5'><mark>that</mark></a>penetrate the blood – brain barrier , causing mild to full surgical anesthesia when inhaled in high concentrations with oxygen . 
Xenon gas can be safely kept in normal sealed glass or metal containers at standard temperature and pressure . However , it readily dissolve in most plastics and rubber , and will gradually escape from a container sealed with such materials . Xenon non @-@ toxic , although it do dissolve in blood and belong to a select group of substances penetrate the blood – brain barrier , causing mild to full surgical anesthesia when inhaled in high concentrations w oxygen .