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Workplace Hazardous Materials
     Information System
    Purpose of WHMIS
 WHMIS is a plan for providing information on
  the safe use of hazardous materials.
 Provide students with the uniform and
  appropriate information required to handle
  hazardous material safely.
Chemical Hazards

Routes of exposure include:
•   Inhalation
•   Ingestion
•   Absorption
•   Injection
             Class A: Compressed Gas
                         • Compressed, dissolved or liquefied

                         • Gas inside cylinder is under pressure
                           and may explode if heated or damaged.

                         • Sudden release of high pressure gas can
                           damage or burn skin.
Examples: propane         Transport and handle with care; make
gas tanks, spray cans,
oxygen tanks, etc.         sure cylinders are properly secured.

                          Store away from sources of heat or fire.
Case Study
A 45-year old male shipfitter/welder died when an
oxygen cylinder he drilled into exploded and
propelled him into a stationary band saw.
The shipfitter had been asked to drill and cut up
acetylene cylinders that were marked with an "X" in a
circle. The oxygen cylinder had the same marking. The
company had no written procedures on the
destruction and salvage of compressed gas cylinders.
          Class B: Flammable &
          Combustible Material
                             • Flammable: burns readily at room
                               temp (a flashpoint below 37.8°C)

                             • Combustible: burns when heated
                               (a flashpoint at or above 37.8°C)

                             • May burn or explode when
                               exposed to heat, sparks or flames.
Examples: ethanol,            Store away from Class C
methanol, acetone; phenol,     (oxidizers).
butane, varnishes, spray
paints, etc.
                              Store away from sources of heat,
                               sparks and flame.
Dwight’s Fire Drill 
         Class C: Oxidizing Material
• Oxidizers can cause other materials to burn or explode by
  providing oxygen
• Examples: potassium permanganate, hydrogen peroxide.
• Oxidizers can increase the speed & intensity of a fire and cause
  substances that do not normally burn readily in air to burn
• Oxidizers can cause combustible materials to burn
  spontaneously without the presence of obvious ignition sources
  such as a spark or flame.
• May burn skin and eyes on contact.
 Store away from Class B materials and sources of heat and
Drops of glycerin are placed onto Potassium
Permanganate (strong oxidizer)
         Class D, Division 1 Materials Causing
         Immediate and Serious Toxic Effects
                  •   May cause immediate death or serious
                      injury if inhaled, swallowed, or absorbed
                      through the skin.

                  •   Small volumes can have a toxic effect.

                   Wear the recommended protective
                      equipment and clothing.
Examples: CO,
sodium cyanide,
sulphuric acid     Avoid inhaling gas or vapours.

                   Wash hands after handling.
               Class D, Division 2 Materials
               Causing Other Toxic Effects
                                  • May cause death or permanent
                                    injury following repeated or long-
                                    term exposure (liver, kidney
                                    damage, cancer, sterility).

                                  • May irritate eyes, skin and breathing
                                    passages: may lead to chronic lung
                                    problems and skin sensitivity.

Examples: Asbestos,                Wear the recommended protective
mercury, acetone, benzene, lead     equipment and clothing.
                                   Wash hands after handling.
             Class D, Division 3 Biohazardous
             Infectious Material
                          • Contact with microbiological agents
                            (e.g., bacteria, viruses, parasites, fungi
                            and their toxins) may cause illness or
                            death or anaphylactic shock.

                           Wear the recommended protective
                            equipment and clothing.

                           Work with these materials in
Examples: Bodily fluids
(Blood/Urine), mould,       designated areas.
                           Disinfect area after handling and
                            wash hands.
            Class E: Corrosive Material
                                   •   Chemicals will react with
                                       metals and living tissue (can
                                       burn eyes and skin on

                                   •   Will burn tissues of
                                       respiratory tract if inhaled.
Examples: sulfuric and nitric
acids, battery acids, ammonium      Avoid inhaling these materials.
gas, sodium hydroxide, chlorine,
etc.                                Avoid contact with skin and
        Class F: Dangerously Reactive
                               • May be unstable, reacting
                                 dangerously to jarring,
                                 compression, heat or
                                 exposure to light.

                               • May burn, explode or
                                 produce dangerous gases
    Potassium in Water
                                 when mixed with
Examples: vinyl chloride,        incompatible materials.
ethylene oxide, picric acid,
etc.                            Store away from heat
                                 (including sunlight), avoid
                                 shock and friction.
Controlled Products
Not Controlled Products

Explosives                       Radioactive
Wood or          Products
Wood                           Food & food
Products                       additives

      Hazardous Waste                        Drugs &
                        Pesticides           diagnostic
       Tobacco                               chemicals
Consumer Product Precautions
    All students who come into contact with
    hazardous consumer products need to:

 Recognize consumer product symbols
 Read and understand consumer product
 Properly use, handle, store and dispose the
Hazardous Household Product Symbols

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