White Polyester Label. Laser printable Permanent Polyester (B-747) is recommended for alphanumeric and barcode applications and works well on the topside of most circuit boards and IC's. Polyester film with an acrylic pressure sensitive adhesive and a printable coating formulated specially for laser printers and toners. High resolution, good solvent and smudge resistance, moderate to high temperature performance. White is a UL recognized component and CSA accepted material when printed with designated laser printers. Service temperature of -40°F to 267°F (-40°C to 130°C).