Safety markers are important because they could be the first warning that a product is hazardous. The person who needs this information might be a driver, loader or an emergency responder.
For example, the skull and crossbones on a label shows that a substance is toxic. The UN number on a placard tells firefighters what chemical they’re dealing with.
The safety marks we use in Canada are part of an international system and are designed to give us information in several ways. The TDG diamond shape is different from what we see on consumer labels or WHMIS labels. The colours can be important too. Blue means it’s dangerous when it comes in contact with water. We’ve seen how the symbols help indicate which class the dangerous goods belong to. The final clue is the class number at the bottom. Safety marks for small containers are called labels.
The definition of a small container is one with a capacity of up to 450 litres, or about a hundred gallons. It includes drums, pails, cylinders, and so on, as well as containers that are not designed to hold liquids or gases, like cardboard boxes.
Besides a TDG label, every small container of dangerous goods must also show the shipping name and UN number.
At this junction, I feel it is of equal importance to talk about placarding larger containers. These are the ones that have a capacity of more than 450 litres, or about a hundred gallons. This measurement is use for containers designed to hold liquids, gases or solids, so it includes portable tanks and bulk tanks as well as large bins and crates.
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