Complete explosive placards with Labelmaster’s Compatibility Group Letters for Flip Placard Systems. These are used to specify controls for the transportation and storage of explosives and to prevent an increase in hazards that might result if certain types of explosives were stored or transported together. Simply place these pressure-sensitive adhesive letters in the designated position on the 1.4 panel of 270HM206 placards for HM-181 compatibility. Ship safely when you communicate clearly with these reliable and efficient labels.