Ct 0.1% Isopentane 0.1% N Pentane 0.25% Trans 2 Butene 0.3% Isoprene 0.5% 1 Butene 0.5% Carbon Dioxide 0.5% Cis 2 Butene 0.5% Cyclohexane 0.5% Ethylene 0.5% Isobutane 0.5% Isobutylene 0.5% N Butane 0.5% Propylene 1% Propane 2% Ethane 3% 1,3 Butadiene 30% Methane Balance Nitrogen Size 350 Lp Certified Standard-spec CGA-510