Create your own labeling solution with Labelmaster's Flammable Solid Blank Placards. Available in a variety of materials and featuring ample space for you to include the UN Number, these Hazard Class 4 placards meet the requirements of 49 CFR 172.500 for domestic and international shipments of hazardous materials by highway, rail and water. Keep your focus on the task at hand. We've already done all the testing to ensure these placards meet the standards set by the DOT and other regulations, so your shipments will arrive on time and fully compliant.