Bulk packaging that contains an elevated temperature material (except molten sulfur or molten aluminum) must have a HOT marking. HOT Markings for Elevated Temperature Materials are printed with HOT to satisfy the HOT marking requirements of 49 CFR, Part 172.325(c) and 172.336(b). HOT Markings for Elevated Temperature Materials measure 273mm x 273mm and are sold in packs of 25. Also sold in cases. Case quantity based on material.