CT 0.1% N HEPTANE 0.2% HEXANE 0.5% 1 BUTENE 0.5% 1 PENTENE 0.5% 1,3 BUTADIENE 0.5% 2 METHYL 2 BUTENE 0.5% CARBON MONOXIDE 0.5% CIS 2 BUTENE 0.5% ISOBUTYLENE 0.5% N PENTANE 0.5% TRANS 2 BUTENE 1% CARBON DIOXIDE 1% ISOPENTANE 1% N BUTANE 1% NITROGEN 1.5% ETHYLENE 1.5% PROPYLENE 2% ISOBUTANE 3% PROPANE 5% ETHANE 7.5% METHANE BALANCE HYDROGEN SIZE 350 LP CERTIFIED STANDARD-SPEC CGA 510 EXXONMOBIL BEAUMONT REFINERY LAB ITEM# BMRL-283 CUSTOM MIX