B-499 labels are nylon thermal transfer labels with a thick construction intended to last in freezers and autoclaves. When printed with Brady Series R4300, R4900, R6000 Halogen Free and R6200 thermal transfer ribbons, as well as R2000 and R5000 dot matrix ribbons, this material is UL recognized and RoHS compliant. In addition, B-499 meets the requirements of a halogen-free material per DIN VDE 0472 part 815.