40mm Numbers These numbers measuring 40mm high are used specifically on Specialist Advice or Compartment labels. The numbers are printed in black on clear vinyl with all the necessary regulatory requirements being met. 100mm Numbers and Letters The 100mm numbers and letters are designed for use on blank Hazchem and Kemler Panels. These numbers and letters are printed in black on clear vinyl and used for displaying the Emergency Action Code (E.A.C) and ‘UN’ number on Hazchem Panels or the Hazard Indicator (H.I) and ‘UN’ number on Kemler Panels.