Calibration Gas, CGA Number Not Applicable, Container Type Cylinder, Cylinder Capacity 103 L, Cylinder Diameter 3.3 in, Cylinder Height 13.6 in, For Use With All OEM Gas Detectors, Gas Mixture Isobutylene 2.5 ppm, Gas Type Isobutylene, Product Type Calibration Gas, Chemical Formula C4H8, CAS Number 115-11-7, Accuracy +/-5 Percent, Background Gas Air, Calibration Certificate NIST, Cylinder Material Steel, Outlet Connection Size 5/8 In.-18, Outlet Connection Type UNF, Standards ISO 9001:2015