C12500000 Compressed gases, toxic, n.o.s. Inhalation Hazard Zone A [UN1955] [Poison gas] Compressed gases, toxic, n.o.s. Inhalation Hazard Zone B [UN1955] [Poison gas] Compressed gases, toxic, n.o.s. Inhalation Hazard Zone C [UN1955] [Poison gas] Compressed gases, toxic, n.o.s. Inhalation Hazard Zone D [UN1955] [Poison gas] UN1955