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Curated with aloha by
Ted Mooney, P.E. RET

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Is Black oxide NSF approved?

Q. My company is currently looking to use a black oxide process on some of our parts, and I need to know if it is NSF approved.
Also if carbonitride or a lindure process is NSF approved.

Thanks

Matt Girouard
Production Engineer - Burlington, Vermont
January 13, 2012

Hi, Matt. I'm no expert in NSF® Certification, but I don't think it works that way. I believe it is the product that is certified, not the finish. Now, whether a product could achieve certification with a black oxide finish probably depends on what the product is.

Black oxide relies on wax or oil to afford any corrosion protection, so I doubt that a black oxided product could be Certified for a drinking water application, for example. NSF has specialists who can guide you through this, though, and that may be indicated in this case. Good luck.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
January , 2012

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