These labels are on a 1" core, a 'smaller core' than the majority of our materials. The recommended printer for these small core parts is the BBP11-34L printer. B-427 has outstanding water and oil resistance. This material has good clarity, conformability and is self-extinguishing. B-427 is not recommended for use in harsh organic solvents such as methyl ethyl ketone, acetone, or 1,1,1-trichloroethane. Print technology: Thermal Transfer. Material type: Translucent vinyl. Finish: Provided in a self-laminated format with a white printable zone and a translucent overlaminating area. Adhesive: Permanent acrylic. Recommended Ribbons: Brady Series R4300 black and R4500 colored (red, blue, green) for thermal transfer printing. Regulatory/Agency Approvals: B-427 is UL Recognized to UL969 Labeling and Marking Standard when printed with the Brady Series R4300 and R6200 ribbons. See UL files MH17154 for specific details. B-427 is RoHS compliant to 2005/618/EC MCV amendment to RoHS Directive 2002/95/EC.