Placards identify special hazards in transport vehicles and large containers. ACCUFORM SIGNS DOT Placards meet the requirements for material, appearance, size, color, and character height, as specified by DOT 49 CFR 172.519, 521-560. These popular, ready-to-go 4-Digit DOT Placards are printed with the combination of hazard classification, hazard division, 4-digit identification number, and UN chemical identification number. Thin and flexible 10-mil poly-based PF-Cardstock material contains no wood-based, paper content. Appropriate for short-term outdoor use, durable PF-Cardstock is tear-resistant, waterproof, and will not crack, distort, or shrink.