1. Corrosion: Materials causing skin corrosion/burns or eye damage on contact, or that are corrosive to metals.

2. Environmental Hazard: Chemicals toxic to aquatic wildlife. (Non-Mandatory)

3.Exclamation Mark: An immediate skin, eye or respiratory tract irritant, or narcotic.

4. Flame: Flammable materials or substances liable to self ignite when exposed to water or air (pyrophoric), or which emit flammable gas.

5. Health Hazard: A cancer-causing agent (carcinogen) or substance with respiratory, reproductive or organ toxicity that causes damage over time (a chronic, or long-term, health hazard).

6. Skull and Crossbones: Substances, such as poisons and highly concentrated acids, which have an immediate and severe toxic effect (acute toxicity).