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
Ethylene oxide	Yellow	Blue	Buff	Buff
Fluorine	Brown	Green	Green	Brown
Fumigant, carbon dioxide--ethylene oxide mixture	Buff	Blue	Buff	Buff
FM--200, heptafluoropropane	Red	Gray	Black	Red
Fumigant, ethylene oxide - dichlorodifluoromethane mixture	Buff	Buff	Buff	Buff
Helium, compressed	Buff	Gray	Gray	Gray
Helium, argon	Gray	Gray	Gray	Gray
Helium, argon, carbon dioxide	Gray	Gray	Gray	Gray
Helium 90.0%, 6.5% Argon, 3.5% Oxygen	Gray	Green	Gray	Gray
Helium, oil -free	Buff	Gray	Gray	Gray
Helium, oil--tolerant	Gray	Orange	Gray	Gray
Helium--oxygen mixture	Buff*	White**	Green	Green
Hexane air mixture	Black	Green	Yellow	Black
Hydrogen	Yellow	Black	Yellow	Yellow
HFC--125, Pentafluroethane, CHF2CF3	Red	Gray	Orange	Red
Hydrogen Bromide	Black	Brown	Brown	Brown
Hydrogen chloride, anhydrous	Brown	White	Brown	Brown
Hydrogen cyanide, anhydrous	Yellow	Brown	White	Brown
Hydrogen fluoride, anhydrous	Green	Brown	Brown	Brown
Hydrogen, oxygen	Yellow	Green	Yellow	Yellow
Hydrogen 1.0%, 20.0% oxygen, 1.0% argon, 1.0% carbon dioxide, 50 PPM carbon monox- ide, 200 PPM R -12, 200 PPM R -114, balance nitrogen	Green	Brown	Yellow	Gray
Hydrogen sulfide	Brown	Yellow	Brown	Brown
Hydrogen sulfide, air mixture	Brown	Green	Brown	Brown
Krypton, oil--free	Gray	Buff	Gray	Gray
Krypton, oil -tolerant	Gray	Buff	Buff	Gray