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

Benefits of Hot Black High Temperature (285º F - Sodium Hydroxide, Oxidizer Nitrite/Nitrate Bath)

  • Requires ventilation for caustic fumes
  • Boiling solution care required - adding water and chemistry
  • 20 minutes blackening time
  • Fe2O3 convert in Fe3O4 (magnetic black rust)
  • Will not blacken cast iron or steel castings (parts turn red/mahogany color)
  • Powder metal parts blind holes
  • Offers abrasion resistance
  • Glossy blue-black color
  • High capital costs
  • pH adjust waste treatment system