Features. Made of Type 321 soft annealed stainless steel. Helps protect from scale and oxide buildup during heat treating in atmospheric furnaces. Eliminates decarburization buildup. Resistant to chromium carbide precipitation during exposure to high temperatures. Can be used in furnaces up to 2000 degrees F. Tool Wrap protects the surface of air hardening tool steels. This cuttofit foil creates an airtight envelope around your part. It can be cut folded and creasesealed with ease. Will not tear easily in normal use. Realize the benefits of a vacuum furnace at a fraction of the cost. Packaged in convenient reclosable cartonSpecifications. Material321 Annealed Stainless Steel. Length100. Unit of MeasurePKG. ORMDNo. Thickness0002. Width24