MIL-STD-101 Color Code For Pipelines And For Compressed Gas CylindersThis standard establishes a common color code for visual warnings to accompany the written identification of materials covered in piping systems and contained in compressed gas cylinders, and to facilitate the segregation of these cylinders at depots. This standard does not define the manner or conditions under which these materials may be used safely.

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MIL---STD---101C

TABLE III. Titles and color codes for compressed gas cylinders---Continued.

Title	Location on cylinder
Title	Top A	Band B	Band C	Body
Nitrogen 88%, 11% tetrafluoromethane (R--14), 1% helium	Gray	Gray	Gray	Gray
Nitrogen 80%, 10% helium, 10% oxygen	Gray	Green	Gray	Gray
Nitrosyl chloride	Brown	White	White	Brown
Nitrous oxide	Blue	Blue	Blue	Blue
Oxygen	Green	Green	Green	Green
Oxygen, argon	Green	Green	Green	Green
Oxygen, aviator's	Green	White	Green	Green
Oxygen, electrolytic	Green	White	White	Green
Oxygen--carbon dioxide mixture	Gray*	White**	Green	Green
Oxygen 99.5%, 10 PPM carbon dioxide, 50 PPM methane, 100 PPB acetylene, 400 PPB ethylene, 6 PPM ethane, 6 PPM nitrous oxide, 2 PPM freon 12, 200 PPB trichlorotrifluoroe- thane, balance argon	Green	Blue	Yellow	Green
Oxygen fluoride	Green	Brown	Green	Brown
Oxygen 17%, 1.1% hydrogen, 0.6% carbon dioxide, 210 PPM freon 12, 210 PPM freon 114, 42 PPM butane, 16 PPM carbon monoxide, 4 PPM toluene, 7 PPM trichloroethylene, 6 PPM freon 11, 3 PPM benzene, balance nitrogen	Green	Brown	Yellow	Gray
Oxygen, nitrogen mixture	Green	Gray	Gray	Green
Ozone	Brown	Green	Green	Green
Pentaborane, stable	Yellow	Brown	Brown	Yellow
Petroleum gas: acetogen, butane, butane--propane, butene--1, cyclopropane, iso- butane, isobutylene, neopentane, propane, etc.	Yellow	Orange	Yellow	Yellow
Phenylcarbylamine chloride	Brown	Gray	Gray	Brown
Phosgene	Brown	Orange	Brown	Brown
Propane air mixture	Black	Green	Yellow	Black