Proper labeling ensures that hazards in a laboratory or work location are communicated and easily identifiable to anyone who works in or visits that area.


  1. Door signs for laboratories will be labeled with all hazards stored in the lab that are above threshold levels (see below).
  2. Shelves will be organized and labeled by hazard class or DDC.
  3. GHS pictogram labels will be placed on applicable secondary containers or secondary containment.
  4. Refrigerators will be labeled with appropriate hazards.
  5. Labels are required on experimental setups, pipes, and other containers that will contain chemicals for longer than one work shift, or will be left unattended.

Label Links, Downloads, and References:

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Container, Cabinet, and Shelving Labels

Use the pictogram from the original container, unless the reagent was created or modified in a way that changes the hazard of the chemical. For information about each of the pictograms, see OSHA's quick reference guide.

Pre-printed labels for purchase:

Download blank labels to print:

Design your own labels:

For any questions or issues regarding container labeling, contact the EHSO.

Door Signs

Door Labeling Requirements

Door Sign Procedure, Instructions, and Templates can be found on the DEHS website.

  • Label the outside of laboratory doors so that emergency responders, facilities staff, and visitors are provided with information regarding the laboratory hazards and 24- hour contact information.
  • All laboratories, support rooms and laboratory storage areas containing hazardous materials, hazardous equipment or other hazards shall be posted with standard hazard warning signage.
  • It is recognized that minimum levels of hazardous materials do not represent a hazard to first responders. Therefore thresholds for concentration, activity and volume have been set for each category (see table below).
Table 1: Hazardous Material Thresholds for Door Signage

Hazard Class


Corrosive Liquids (pH < 3.5 or > 10.5) 4 L
Flammable Liquids 4 L
Flammable Solids any amount
Flammable Gases any amount
Oxidizers (liquid/solid) 4 L/ 1 kg
Organic Peroxides 1 kg
Water-reactive Chemicals any amount
Pyrophoric (air-reactive) Chemicals any amount
Radioactive Materials any amount
Biosafety Level 1-2 Materials any amount
Self-Reactive, Shock-, or Heat-sensitive Materials any amount
Carcinogenic or Mutagenic Agents 100 g
Highly Toxic Materials 100 g
Gases Under Pressure (excluding aerosol cans) any amount
Lasers (excluding completely enclosed and consumer) Any class IIIb and IV laser