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Black coated brass nuts




2007

We manufacture switch seals that have brass nuts overmolded with silicone rubber. The brass inserts have to be black in color. The "black zinc" coating discolors having been exposed to 350 °F (molten rubber). "Black oxide" does not seem like a viable option due to economic constraints. Can you advise on any other method of making these inserts black as applicable to our process?

Thank you in advance

Alex Blakeman
- Towaco, New Jersey


Try black chrome, or ammonium/copper carbonate black patina for brass, or copper nitrate [affil links] black (baked). Hope it helps and good luck!

Goran Budija
- Cerovski vrh Croatia
2007




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