Chemistry
WHMIS and Safety
Hazardous Material Symbols
Labels & Symbols are used to indicate
hazardous materials.
Why Symbols?
They are universal
– All languages understand
What do these symbols mean?
2 Sets of Symbols
1. HHPS (hazardous household product
symbols)
2. WHMIS (workplace hazardous
material information system)
HHPS - 4 Different Symbols
= Poison
= Flammable
= Explosive
= Corrosive
HHPS – Degree of Danger
= Caution
= least dangerous
= Warning
= medium level danger
= Danger
= most dangerous
Putting it all together…
(WHMIS)
Used in all workplaces to indicate
dangerous materials.
WHMIS
= Compressed Gas
– May explode near heat or fire.
Examples – aerosol cans, propane
tank
WHMIS
= Flammable
– May burst into flames.
Examples – gasoline, natural gas
WHMIS
= Oxidizing Material
– May explode when it comes in
contact with combustible
materials.
Examples – bleach
WHMIS
= Corrosive Material
– May cause eye and skin
irritation or burns.
Examples – battery acid,
hydrochloric acid
WHMIS
= Dangerously Reactive
– May cause severe reactions
when exposed to water or heat.
Examples – nitroglycerine
(dynamite), potassium
WHMIS
= Poisonous & Infectious
Materials – Immediate and
Serious Toxic Effects
– May cause death
Examples – cyanide, arsenic
WHMIS
= Poisonous & Infectious
Materials – Other Toxic Effects
– May eventually cause death
birth defects, cancer or
sterility.
Examples – lead, mercury
WHMIS
= Poisonous & Infectious
Materials -Biohazardous Infectious
Material
– May cause an infectious disease
Examples – coronavirus (SARS), HIV
(AIDS)
What is an MSDS?
Material Safety Data Sheet
Has more information on each individual
chemical
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