Hot Black Oxide

EPI manufactures a variety of conventional hot oxide processes for blackening iron, steel, hardened tool steel, cast iron, forged steel, stainless steel, copper, brass, cadmium, die cast zinc and electroless nickel. Call us at 262-786-9330 for assistance in selecting the black oxide best suited for your metal blackening needs. Questions about Black Oxide? Read our Black Oxide FAQ or see our videos at our Black Oxide Library.

Ultra-Blak 400 process – The best performing black oxide process because:

• Ultra-Blak 400 is a premium grade black oxide formulation that actually costs less to apply.
• There is no rub-off as is common with other black oxide processes.
• Faster blackening reaction for reduced immersion time.
• Blacker finish and greater depth of blackness.
• 20% to 30% less salt consumption than with other black oxide processes.
• User friendly with a wide window of operation.
• Blackens a wider range of steel alloys in the same bath with less rejects than competitive baths.
• Frequently operated at a temperature as low as 272°F.
• Only uses 5.75 pounds of Ultra Blak salts are used per gallon of water versus
  the 7-8 pounds used in other black oxide processes.
• Its unique wetting agent produces a more uniform black finish and a quicker reaction. The reduced viscosity ensures complete coverage of all surfaces.
• Complies with and exceeds the requirements of military specification MIL-DTL-13924D Class 1 and AMS-2485H. It meets and exceeds the oxalic acid test and salt spray requirements.

Black Oxide Advantages

• No dimensional change (paint builds up)
• Reduces handing of parts- many parts can be done in a rotating barrel
• No primer or precoat phosphate required
• No bake oven – no volatile organic fumes
• Less equipment and less maintenance of equipment
• Higher productivity – less setup and less processing time

Ultra-Blak Rectifier — Additive for black oxide solutions to control the buildup of excessive red iron oxide and copper which cause off colored reddish finishes. Liquid concentrate used at 0.5 to 1 ounce per gallon of oxide solution.