CR Gas

CR Gas Chemical formula

Chemical information

EA-3547; Gas CR. Dibenz[b,f][1,4]oxazepine.
Chemical formula: C13H9NO = 195.2.
CAS — 257-07-8.


A riot-control gas with irritant and lachrymatory properties similar to those of CS gas; it is described as a tear gas. CR gas is reported not to be hydrolysed by water and therefore to be suitable for use in water cannons.
1. Blain PG. Tear gases and irritant incapacitants. 1-chloroacetophenone, 2-chlorobenzylidene malononitrile and dibenz[b,f]1,4-oxazepine. Toxicol Rev 2003; 22: 103–10.
Published May 08, 2019.