Strong acidic properties.
Strong alkaline/basic properties.
Biological hazard: poses a threat to human health or the environment.
Corrosive substance: destroys living tissue or metals.
Extremely low-temperature materials (e.g., Liquid Nitrogen).
Strong oxidizer: enhances the combustion of other materials.
Pure oxygen or oxygen-enriched environment.
Highly poisonous or toxic substance.
Emits ionizing radiation.
Simple asphyxiant gas: displaces oxygen in the air.
Reacts unusually or dangerously with water (e.g., Alkali metals).
Specific hazard notices and symbols used in the white section of the NFPA 704 diamond.