Get specific when shipping flammable gas with Labelmaster's Poison 4-Digit Placards. Pre-printed with a UN Number, these Hazard Class 6 placards meet the requirements of 49 CFR 172.500 for domestic and international shipments of hazardous materials by highway, rail and water. When we're handling the standards and regulations testing and printing of your shipping placards, you're freed up to focus on what's most important - getting your job done right.