1. Waste chemicals should, if possible, be stored in a central chemical storage facility within each building.
  2. If a central storage facility does not exist, chemical waste must be stored in the laboratory until arrangements can be made for disposal.
  3. Generally, waste chemicals will possess the same hazards as new chemicals. All safety precautions for the handling and storage of new chemicals therefore apply to waste chemicals.
  4. It is recommended that chemical waste be segregated according to "Chemical Code Groups" or by WHMIS class to avoid the creation of incompatible mixtures.
  5. The National Fire Code of Canada regulates the maximum permissible quantities for storage of flammable and combustible chemicals.


Maximum container size in laboratories: 5L.

>5 L. volume requires metal safety cans to a maximum size of 25 L.

Maximum quantity of flammable and combustible chemicals in a lab: 300 L. total with < 50 L. of flammables

>300 L. of flammable and combustible chemicals combined, or >50 L. of flammables requires storage in ULC approved safety cabinets

ULC Approved Safety Cabinets

Maximum quantity of flammable and combustible chemicals per cabinet:
500 L. total with < 250 L. of flammables

Maximum 3 cabinets per fire compartment or in a fire-rated room

Chemical Storage Rooms (2 hr. Fire-rated)

Maximum quantity of flammable and combustible chemicals: 10,000 L. (double this figure if room is designed with an automatic fire extinguishing system).

Maximum density of flammable and combustible chemicals: 200 L./m2

Note: 25 L. drums of solvents (flammable and/or combustible) require storage in a flammable storage cabinet or a chemical storage room designed and rated for that purpose. They must not be stored laboratories. Maximum container size in rooms or labs is 5 L.

Facilities for temporary storage of bulk quantities of new chemicals are available in the Chemical Storage Room (C.S.R.) at the Services Building. Administration of the CSR is the responsibility of the Department of Physical Plant Stores Manager. University departments with requirements for receiving of bulk chemicals are encouraged to make arrangements to use the C.S.R. A 'Procedures Manual' for operation and use of the C.S.R. is available from the Physical Plant Stores Manager.


  1. All containers used for storage of chemical waste must be UN approved, compatible with the contents, properly sealed, and in good condition.
  2. Any container which is not properly sealed or that is leaking will not be picked up for disposal until the leak has been contained.
  3. Small containers, such as vials, must be placed in one larger container with a label applied to the outer surface. It is recommended that the contents of the vials be emptied into one larger container for disposal.
  4. To minimize numbers of waste containers, partially filled containers of the same chemical or chemical mixture must be consolidated into a single container.
  5. Liquid waste containers must be filled to 70-80% capacity, only, to allow for vapor expansion and to minimize the potential for spills.
  6. Incompatible combinations of chemicals must not be mixed in a single container (refer to Chemical Code Groups).
  7. Most empty chemical containers can be disposed of with regular garbage provided the chemical is not on the CEPA Priority Substances List. If in doubt, contact the Safety Office.


  1. To prevent the mixing of waste that could create an incompatible combination, all chemicals must be clearly identified by the original manufacturer label (provided the contents consist only of this chemical) or a W.H.M.I.S. workplace label.
  2. Chemical name, and any trade names, must be used to identify chemical waste.
  3. Remove or thoroughly obliterate any old labels or chemical information that may cause confusion as to the present contents of the waste container.
  4. Mixed wastes, spent wastes, and any chemicals that have been altered from their original form must be described by percentage of total volume on the label and must total 100%.
  5. After waste has been segregated and labeled, list all hazardous waste containers to be picked up, including the contents of each container (by % concentration) and the container size (weight or volume) on the UNB Hazardous Waste Disposal Workorder (attached).