Specification: CAS No.: 124-38-9 EINECS No.: 204-696-9 UN No.: UN1013 Purity: 99.99%-99.999% Dot Class: 2.2 Appearance: Colorless, non-flammable, liquefied and odorless gas. Grade Standard: Food Grade, Industrial Grade, Medical Grade. Specification 99.999% 99.9999% Carbon Monoxide