CT 1% HYDROGEN 10% METHANE 20% ETHYLENE BALANCE PROPANE SIZE 150A CERTIFIED STANDARD-SPEC CGA 350 NOVA, GEISMAR BLEND ITEM NUMBER 72A BLEND +/-5% ANALYTICAL +/-2% DEW POINT 40 DEG F MAINTAIN CYLINDER AT OR ABOVE 70F TO PREVENT COMPONENT CONDENSATION AND CALIBRATION ERROR CUSTOM MIX