Hazard symbols give a quick visual warning, but the surrounding system decides what a person must do. In a workplace, a yellow triangular safety sign warns of a hazard. On chemical labels, red diamond CLP pictograms identify categories such as corrosive, flammable or acutely toxic substances.
Workplace warning signs
A warning sign uses a triangular shape, black pictogram and yellow background with black edging. Examples cover electricity, harmful substances, forklifts, slippery surfaces, hot surfaces and other hazards. The wording can support the symbol, but should not change its recognised meaning.
Chemical hazard pictograms
Chemical labels use a different red-diamond system under the GB Classification, Labelling and Packaging rules. Read the product label and safety data sheet. A wall sign is not a substitute for container labelling, training, ventilation, PPE or safe storage.
Choosing the right sign
- Identify the remaining significant risk after other controls.
- Choose the recognised message and symbol for that risk.
- Check the normal approach, lighting and viewing position.
- Select a material and size suited to the environment.
- Explain unfamiliar signs and maintain them.
The HSE says safety signs are required where a significant risk remains after other relevant measures. It also warns against using so many signs that they cause confusion.