6830-01-025-5672 (MIL-A-18455)
NSN 6830-01-025-5672 (NIIN 01-025-5672) is a calibrating gas mixture in Federal Supply Class 6830, Gases: Compressed And Liquefied — a predetermined mixture of 2 or more gases in which each component is measured to extreme accuracy and its contents certified. Manufacturer part number MIL-A-18455 (Military Specifications, CAGE 81349); also referenced as D731-2077 (Gas Equipment Engineering).
NIIN assigned August 1976; DEMIL A (none required); unit of issue CY, $639.36 gov standard price.