A-S1, Resin Ribbons The AS1 is a pure resin ribbon developed for applications requiring excellent mechanical and solvent resistance. It is suited to most synthetic materials such as PVC, PET, PP and various matt and gloss coated papers, and is the preferred choice for printed images that are exposed to harsh environments. The AS1 is UL recognised and BS5609 approved when used in association with the correct substrates. It has a heat resistance of up to 180ºC (356ºF) and, as with all Toshiba ribbon products, it offers the very best in printhead protection. Toshiba AS1 is the preferred choice for all images destined for harsh situations.