Calibration Gas, CGA Number CGA 590, Container Type Cylinder, Cylinder Capacity 552 L, Cylinder Diameter 4.5 in, Cylinder Height 25 in, For Use With All OEM Gas Detectors, Gas Mixture Ethylene (42.6 Percent LEL) 1.15 Percent, Gas Type Ethylene, Product Type Calibration Gas, Chemical Formula C2H4, CAS Number 74-85-1, Accuracy +/-5 Percent, Background Gas Air, Calibration Certificate NIST, Cylinder Material Steel, Outlet Connection Size 3/4 in, Outlet Connection Type NGT, Standards ISO 9001:2015