Hydrogen Sulfide H2S specialty gases , industrial gases, airgas pure gases , Self- ... .5%-99.999%Carbon Monoxide _ CO99.5%-99.99%Hydrogen _H299.999%-99.9999%Carbon Dioxide _ CO299.995%-99 ... %Ethane _ C2H699.5%-99.995%Ammonia _ NH399.99995% Hydrogen Sulfide, H2S, specialty gases