Tool Wrap / Heat Treating Foil

Tool Wrap is a thin, stainless steel foil used to protect tools and dies during the hardening process by preventing decarburization (scaling). Available in Type 321 for temperatures up to 2000°F and Type 309 for up to 2240°F, it is commonly used in manufacturing by maintenance staff, mold makers, and machine operators. The Tool Wrap is particularly useful when a controlled vacuum furnace is unavailable, and it works by sealing the part in an airtight envelope to mimic the conditions of such a furnace. It can be cut with snips or heavy scissors and sealed without special tools, although a seam roller can help ensure airtightness. The material cannot be reused due to the depletion of its titanium content and its brittleness after use. Additionally, some parts may require double wrapping or venting to prevent damage during heat treatment. Proper handling and the addition of extra heating time may be necessary depending on the specific application.