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Insta-Blak 335

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Insta-Blak 335 represents a major breakthrough in the room temperature blackening of iron and steel. For years, Insta-Blak 333 has been the standard in room temperature blackening. Now, Insta-Blak 335 produces an even darker black finish.

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Insta-Blak 335 is recommended for blackening cold and hot rolled carbon steels, alloy steels, tool steels, as well as cast iron, forged steels and powdered metal. It will even blacken A2 Tool Steel without using a prep (although it may have a small amount of smut). It will not blacken stainless steels. Insta-Blak 335 works well for properly cleaned steel sheets and parts for interior architectural steel finishes.

Insta-Blak 335 is Perfect For:

  • Tools/fasteners, firearms, architectural surfaces, and furniture
  • Steel sheets and architectural surfaces
  • A2 Tool Steel
  • Expedited shipping

The Blackening Process: Insta-Blak 335

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

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. Clean the parts prior to beginning the blackening process. 

NOTE: Mil scale or heat treat scale must be removed prior to blackening in order to achieve the best and most uniform finishing results.

Recommended Cleaning Products:

  • E-Kleen SR 148-E is an aqueous alkaline soak cleaner that removes carbon smut from steel and metal parts, resulting in better adhesion and brighter finishes. It’s ideal for soak cleaning.

 

Rinse

After cleaning the metal parts, rinse them for a minimum of 30 seconds in a bottom fed overflowing cold water rinse tank to remove residual cleaner.

Blacken

Immerse the metal parts for 2-3 minutes in 10% by volume solution of  Insta-Blak 335

The shortest immersion time necessary to produce the desired black is between 2-3 minutes, up to a maximum of 5 minutes, depending upon the alloy and surface hardness. Immersing parts for an excessive amount of time will not increase the depth of blackness and may result in the formation of an undesirable smut or rub-off. 

Rinse

Rinse in cold, overflowing tap water for 30–60 seconds to remove residual blackening solution and ensure sealant will not be contaminated.

Seal

Seal the black-oxide finish by immersing the parts for one to two minutes in a compatible E-Tec water-displacing solution. The 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.

See the rust preventative and sealing comparison chart to find the best E-Tec solution for your needs.


Recommended Sealing Products:

E-Tec 501 is a slightly oily lubricant and rust/corrosion inhibitor for ferrous and non-ferrous metals. It produces 110–130 hours of salt-spray resistance.
E-Tec 503 is a dry-touch and glossy lubricant and rust/corrosion inhibitor for ferrous and non-ferrous metals. It produces 70–90 hours of salt-spray resistance. 
E-Tec 504 is a dry-to-touch, hard-film, solvent-based lubricant and rust and corrosion inhibitor for ferrous and non-ferrous metals that produces 50 hours of salt spray resistance.
E-Tec 505+ is a dry, soft-film solvent-based lubricant and rust and corrosion inhibitor for ferrous and non-ferrous metals that produces 96 hours of salt spray. 
E-Tec 521 is a low-viscosity, water-based emulsion providing protection for all types of plating.
E-LAQ 525 is a water-resistant, hard (2H–3H pencil hardness), and clear acrylic lacquer finish for coating metal or blackened surfaces.