SUBSTANCE NAME: Lead azide CAS Number: 13424-46-9 UN Number: 0129 CLASSIFICATION OF PURE SUBSTANCE Risk Phrases: R3 Extreme risk of explosion by shock, friction, fire or other sources of ignition. R20/22 Harmful by inhalation and if swallowed. R33 Danger of cumulative effects. Safety Phrases: S33 Take precautionary measures against static discharges. S34 Avoid shock and friction. S35 This material and its container must be disposed of in a safe way. CLASSIFICATION OF SUBSTANCE AS AN INGREDIENT IN MIXTURE Health Hazard Classification : Harmful Concentration Cut-off level : 25 % weight/weight Above this concentration ingredient to be classified with R20 and/or R21 and/or R22. When classifying a substance as an ingredient in a mixture at a particular concentration cut-off level take into account any risk phrases that apply at the lower concentration cut-off level.