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Keith Stainless Steel Heat Treat Foil is an annealed stainless steel used in the heat treating of tool steel parts. The wrap eliminates the need for Ni-Chrome, box packing and the use of sawdust or other carbonaceous materials. No special controlled atmosphere furnaces are required to use the foil.

Foil Grades
Keith stocks stainless steel heat-treating foil with a .002" thickness in two grades of alloy and temperature ranges ready for immediate shipment to you. Alloy #321 is a high-titanium, soft annealed stainless intended for heat treating parts at temperatures up to 2000F. Alloy #309 may be used at temperatures up to 2240F.

Sizes and Packaging
Alloy #321 foil is available in 24" wide by 100 ft long (200 sq ft) rolls packed in convenient dispenser cartons, and for our high volume users may be supplied in 50 lb open rolls. Alloy #309 foil is available in 24" wide by 120 ft long (200 sq ft) rolls in dispenser cartons.

Keith Heat Treat Foil is guaranteed to be taken up to temperature.

  • #321 Stainless guaranteed to 2000° Fahrenheit
  • #309 Stainless guaranteed to 2240° Fahrenheit

Obtaining the protection for air-hardened tool steel parts at the temperature you need is a simple task at hand; Keith Stainless Steel Heat Teat Foil is easy to use:

  • Place tool In Foil.
  • Fold over and crimp edges to form an air-tight package.
  • Place package in oven and heat treat in usual way.

Special widths and lengths of foil are also available by special order.


  • Typically used in heat-treating applications to reduce scale and discoloration of parts
  • Protects parts from oxide build up
  • No special controlled atmospheric furnaces are required
  • Protects the surface of heat treated parts