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

(d) Primary color warning. A primary color warning is the color assigned to the class into which a material is classified in accordance with its primary hazard from a safety standpoint.

These colors appear as a circular band on piping systems, and as main body, top, or band colors on compressed gas cylinders.

(e) Secondary color warning. A secondary color warning is the color assigned as a warning of a secondary hazard possessed by a material having type of hazard distinctly different from that indicated by its primary color warning. These colors appear as arrows (or triangles) on piping systems and as main body, top, or band colors on compressed gas cylinders.

(f) Title. A title is any lettered identification required on a piping system or a compressed gas cylinder. Titles shall identify the contents by complete names, or by generally recognized abbreviations, symbols, letters, numerals, or combinations thereof.

4. GENERAL REQUIREMENTS

4.1 Colors. The colors assigned in this standard shall conform in hue and chroma to the requirements identified by number in FED---STD---595 (see 6.4). No change shall be made in the assigned colors without prior approval of the preparing activity of this standard.

4.2 Warning colors. The following colors are assigned for use as both primary and secondary warnings.

(a) Yellow, No. 13655 �� flammable materials. All materials known ordinarily as flam- mables or combustibles.

(b) Brown, No. 10080 �� toxic and poisonous materials. All materials extremely hazard- ous to life or health under normal conditions as toxics or poisons.

(c) Blue. No. 15102 �� anesthetics and harmful materials. All materials productive of anesthetic vapors and all liquid chemicals and compound hazardous to life and property but not normally productive of dangerous quantities of fumes or vapors.

(d) Green, No. 14187 �� oxidizing materials. All materials which readily furnish oxygen for combustion and fire producers which react explosively or with the evolution of heat in con- tact with many other materials.

(e) Gray, No. 16187 �� physically dangerous materials. All materials, not dangerous in themselves, which are asphyxiating in confined areas or which are generally handled in a dan- gerous physical state of pressure or temperature.