DIN 67510-4
DIN 67510-4 Phosphorescent pigments and products - Part 4: Products for phosphorescent escape route systems - Markings and applications
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 02/01/2008
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 02/01/2008