ISO 3864

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ISO 3864 specifies international standards for safety signs and markings in workplaces and public facilities. These labels are graphical, to overcome language barriers.[1] The standard is split into four parts:

  • ISO 3864-1:2011 Part 1: Design principles for safety signs and safety
  • ISO 3864-2:2016 Part 2: Design principles for product safety labels
  • ISO 3864-3:2012 Part 3: Design principles for graphical symbols for use in safety signs
  • ISO 3864-4:2011 Part 4: Colorimetric and photometric properties of safety sign materials


These are the colours specified in ISO Standard 3864-4 in RAL colour standard.[2]

Meaning RAL Name RAL Number RGB Hex[3] Example of Colour
Warning Signal Yellow 1003 #F9A800
Prohibition/Fire Equipment Signal Red 3001 #9B2423
Mandatory Signal Blue 5005 #005387
Safe Condition Signal Green 6032 #237F52
Backgrounds and Symbol Signal White 9003 #ECECE7
Symbol Signal Black 9004 #2B2B2C

Related standards[edit]

The corresponding American standard is ANSI Z535, which is incompatible with the ISO standard. ANSI Z535.1 divides "Warning (Signal Yellow)" into two colors: Yellow (Pantone 109) for 'caution' messages, and Orange (Pantone 151) for stronger 'warning' messages.[4][5][6] Like ISO 3864, ANSI Z535 includes multiple sections: ANSI Z535.6-2006 defines an optional accompanying text in one or more languages.

ISO 3864 is extended by ISO 7010, which provides a set of symbols based on the principles and properties specified in ISO 3864.

See also[edit]


  1. ^ ISO 3864-1:2011 from the ISO Catalog
  2. ^
  3. ^ "RAL Farben | RAL CLASSIC Farben". (in German). Retrieved 2016-05-22.
  4. ^ "U.S. Code of Federal Regulations, 49 CFR 172.407". Retrieved 2020-09-28.
  5. ^ "ANSI NEMA Z535". ANSI IBR Standards Portal. American National Standards Institute; National Electrical Manufacturers Association. Retrieved 2020-09-28.
  6. ^ Frantz, J. Paul. "Update of ANSI Standards for Warnings and Future Directions" (PDF). Applied Safety and Ergonomics, Inc. Retrieved 2020-09-28.