There is a small fee for samples shipped in the continental U.S. This can range from $10-$75. Products shipped outside the continental U.S. can be subject to certain restrictions. Freight charges may range from $75-$300.

Hot Black Oxide

The Unique Characteristics of Hot Black Oxide Process are:

  • Does not change dimensions - 5 -10 millionths of an inch
  • Requires ventilation for caustic fumes
  • Boiling solution care required - adding water and chemistry
  • 5 - 20 minutes blackening time
  • Blackens cast iron and some low carbon steels
  • Offers abrasion resistance
  • Satin rich black color
  • Needs seven stage blackening line
  • pH adjust and nickel / chrome waste treatment system
  • Meets Military Specs MIL-DTL-13924D, Class 4

Ultra-Blak 407-L

Liquid Stainless Steel Blackening Process is a ready-to-use solution of EPi’s oxidizing salt formulation.