This article explains what the CLP Regulation entails and how chemical substances must be correctly classified and labelled under European legislation. It covers the three hazard classes, the nine mandatory CLP hazard pictograms, the use of H, P and EUH statements, and labelling requirements including the signal word, UFI code, and CAS and UN numbers. It also explains who is responsible for classification and how CLP relates to REACH and safety data sheets (SDSs). Practical examples, a sample label and an extensive FAQ make the article useful for everyone who works with chemical products.