Under ADR a hazard warning placard must be 250 x 250mm in size. The surrounding black border must be 5mm in width and spaced 3-5mm from the placard edge. Similarly, where a substance is packaged in a quantity greater than its limited quantity a 100 x 100mm UN warning label is required. A label must have a border of thickness no less than 2mm spaced 5mm from the diamond edge.