Hazard Class 2 Oxygen Worded Placards are required by 49 CFR 172.500 for highway, rail and water shipments of hazardous materials. Designed to meet DOT specifications for color and size, these 273mm x 273mm Oxygen Hazard Class 2 Placards may be used domestically as well as internationally. Our aluminum DOT Hazard Class 2 placards are an excellent investment if you’re looking for long-lasting use. Constructed of a corrosion-resistant aluminum alloy, these DOT placards will withstand the toughest road and weather conditions. The acrylic paint finish is baked on at 400 degrees for superior durability. Aluminum Oxygen Hazard Class 2 placards can be used in Slidemaster holders. Sold per each.