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Ultra-Blak 407-L

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Ultra-Blak 407-L is a ready-to-use liquid solution that produces a black finish on stainless steel surfaces, offering dimensional stability and abrasion resistance.

Add 1–5 gallons per week per 100-gallon bath to replace chemistry consumed through drag out.

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How to Use Ultra-Blak 407-L

Ultra-Blak 407-L is a ready-to-use formula that can be used to blacken any stainless steel item or surface.

Use Ultra-Blak 407-L to:
  • Give stainless steel parts sleek black finishes
  • Work with a hot-temperature black-oxide solution
  • Ensure dimensional stability
  • Achieve superior abrasion resistance
  • Give black-oxide baths an initial charge
  • Meet MIL-DTL-13924D Class 4 standards

Guides & Manuals

Safety & Technical Data

The Blackening Process: Ultra-Blak 407-L

For the longest-lasting, deepest, and cleanest black finishes, we recommend the following blackening process. Please read all safety data sheets and technical data sheets prior to beginning a project.

1. Clean

Soils such as cutting oils, coolants, lubricants, and rust inhibitors must be removed from the metal workpiece. Soils can inhibit the blackening process and negatively affect coating adhesion and appearance. Thoroughly clean and degrease the parts prior to beginning the blackening process.

Recommended Cleaning Products:
  • E-Kleen SR 148-E is a low-caustic formula that's ideal for removing a wide range of oils and soils.
  • E-Kleen SR 102-E is a high-caustic formula that removes difficult-to-clean metal-working fluids.
  • E-Kleen 163 works well in hand-blackening applications at room temperature. It contains no caustic and is not hazardous.

2. Rinse

After cleaning the metal parts, rinse them in cold, overflowing tap water; it’s necessary to rinse the parts to remove residual cleaning solution. Parts carrying over un-rinsed film of alkaline cleaning solution would quickly contaminate the subsequent chemicals in use, resulting in a spotty or non-adherent black finish. 

Immerse the parts to be blackened for 30–60 seconds.

3. Blacken

Immerse the parts in a boiling solution of Ultra-Blak 407-L until a deep black color develops. Required immersion time may vary from 2–15 minutes, depending upon the mass, type, and surface condition of parts.

If Ultra-Blak 407-L isn't quite what you’re looking for, consider these similar products:
  • Insta-Blak SS-370 is a room-temperature blackening solution without caustic fumes.
  • Ultra-Blak 407 is powder-based process that is an alternative to liquid-based Ultra-Blak 407-L.

4. Rinse

Rinse in cold, overflowing tap water for 30–60 seconds to remove residual blackening solution and ensure sealant will not be contaminated. Transfer the part from the blackening solution to the cold-water rinse as quickly as possible to avoid discoloration.

5. Seal

Seal the black-oxide finish by immersing the still-wet parts in a corrosion-inhibiting and rust-preventative solution. E-Tec corrosion inhibitors are formulated to rapidly displace the residual acidic solution from the preceding rinse and produce long-term corrosion protection. As the E-Tec is absorbed, it enhances the depth of black, which may take several hours.

Recommended Sealing Products:
  • E-Tec 504 is a solvent-based, dry-to-touch oil formula.
  • E-Tec 515 is a water-soluble oil that contains no VOCs. It's the most economical method for achieving corrosion protection.
  • E-Tec 522 is a water-based satin wax for lubrication properties. It provides a dry-to-touch finish.