Get specific when shipping solids that emit flammable gases when in contact with water. Use Labelmaster's Dangerous When Wet 4-Digit Placards. Pre-printed with a 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. 
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