When ANSI Z136.1 “Safe Use of Lasers” was revised in 2014, one of the most significant changes was laser sign design.  Over the past 20+ years I’ve visited many facilities ranging from universities to industrial plants and medical facilities.  I find more often than not laser signs are not compliant with ANSI.  So – here’s the deal.  Any NEW laser sign design must be in accordance with ANSI Z535.2 “Environmental and Facility Safety Signs”.  Below are samples for your review.

This three panel format has the signal word and safety alert symbol at the top, the left panel contains the laser radiation hazard safety symbol and the right panel contains the “message”.

DANGER.  This signal word is reserved for Class 4 lasers only and indicates that death or serious injury will occur if proper control measures are not implemented.  This should be restricted to Class 4 lasers with high out put power (multi-kilowatt) or pulsed energies with exposed beams.

WARNING.  This signal word is to be used for most Class 4 lasers and all Class 3B lasers and indicates an imminently hazardous situation that could result in death or serious injury.

CAUTION.  This signal word is to be used for Class 3R (except laser pointers), Class 2 and 2M and indicates a hazardous situation that could result in minor or moderate injury.

NOTICE.  This signal word is to be used for a temporary laser controlled area such as during periods of service or maintenance.

For the message panel certain information is required by the ANSI standard. 

  1. The laser classification
  2. Special precautionary instructions or protective action such as:
    • Laser eyewear required
    • Avoid eye or skin exposure to direct or scattered radiation
    • Do not stare into beam directly
    • Authorized personnel only
  3. The laser type and power
  4. Required OD of laser eyewear
  5. LSO name and contact info

Laser signs should be posted in locations where they will be easily seen such as on the door of a laser lab. 

One more quick note – the beginning of the post mentioned any NEW laser signs – if you have older signs that were compliant with a previous version of ANSI Z136.1 you are good to go.  Check with your LSO, look at the standard or contact me directly if you are unsure if your signs are compliant and remember – you only have one set of eyes!  Stay LaserSmart!