Laser printable Permanent Polyester B-747A 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. Shelf life is two years from the date of receipt for this product as long as this product is stored in its original packaging in an environment below 80 deg F 27 deg C and 60% RH. Service temperature of -40 deg F to 267 deg F -40 deg C to 130 deg C.