1230 Flammable Liquid 3 Placard. DOT vehicle placards help ensure that hazardous material shipments reach their destinations without costly delays or rejections. All placards have square corners and no holes. TDG Part 4 - Dangerous Goods Safety Marks in Canada as part of TDG clear language. Use with slide-in Placard Holders from Brady® (sold separately). Constructed of high impact polystyrene with protected graphics. Good chemical and abrasion resistance.