Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Nylon coating Problems & Solutions
Q. Our company needs to Nylon Powder Coat 304 Stainless parts that go into surgical sterilization cases. These parts may be exposed to extended ultrasound or plasma cleaning. They may be exposed to temperatures in excess of the recommended 273 °F (steam and ambient) and may be exposed to chemicals with pHs up to 13.
Also, is there a recommended surface roughness needed prior to the application of the primer and powder?
Steve Yaeger- Avondale, Pennsylvania USA
2001
A. Steve- I'm not sure nylon will help you out here.
I use the autoclave at 135 °C for ten minutes to help me strip off the nylon. Comes off fairly easy. Due to Bioburden tests performed, we do not use a primer. Not that it failed with it, just that we didn't test for it. I'm now exploring e-coat options.
Tom Greifenkamp- Cincinnati, Ohio USA
2001
2002
Tip: Readers want to learn from your situation,
often just skipping abstract questions.
Q. We have some wires that need nylon coating. Our problem is the inconsistent thickness of coating vary from 200-800 micron, which desired thickness is 200 micron max. How can we spray coat a thin coating?
Ameley Low- Kuala Lumpur, Malaysia.
A. Hi Ameley. What do you mean by 'spray coat'? If you mean you are spraying a liquid nylon coating, you can probably get thinner and more consistent thickness by switching to nylon powder coating. 200 microns would be a fairly thick electrostatically sprayed nylon coating, or a fairly thin fluidized bed coating. Readers would probably need some data to figure out why your coatings are thicker than you want though. Are you working with a good supplier of the liquid or powder?
Luck & Regards,
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
A. The Nylon Coating we use for protecting SS wire handrails dries to around 3 microns.
Steven Scarpin- Melbourne,Victoria, Australia
2002
Thanks Steven. You probably pictured SS handrail wire because that's what you work with, whereas I pictured the nylon coated steel wire used in things like bra hooks because that's the wire that I've seen coated. Readers probably need more from Ameley to even begin to picture his situation :-)
Regards,
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Multiple threads merged: please forgive chronology errors :-)
"Nylon Powder for Coating on Surgical Instruments"
2003Q. Our company needs to Nylon Powder Coat 304 Stainless parts that go into surgical sterilization cases. These parts may be exposed to extended ultrasound or plasma cleaning.
They may be exposed to temperatures in excess of the recommended
273 °F (steam and ambient) and may be exposed to chemicals with pHs up to 13.
Also, is there a recommended surface roughness needed prior to the application of the primer and powder?
surgical instruments - SAILKOT, Punjab, Pakistan
A. Hi cousin Geoffrey. We thank you for posting in English, and appreciate that English might be difficult for you, but copying someone else's posting & re-posting it as a new discussion topic isn't productive -- plus google penalizes us for duplicative content -- so we've now combined the postings.
Next, ... :-)
Luck & Regards,
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Loss of Gloss in Nylon Powder Coating
Q. Hi Finishing Experts,
My company has recently begun powder coating 304 SS with a high gloss, black nylon powder coat. We recently had a single batch come out of the oven gray with a matte finish. The batch before this occurrence was a shiny black. We ran another 3 parts after this concern and found that they were also shiny black. It has been very humid in the shop, but we have not altered our storage conditions. Could humidity or moisture in the nylon powder cause this sort of defect?
Any ideas as to what might contribute to this immediate color change and loss of gloss?
Thanks for your help.
- Colchester, Connecticut, USA
June 27, 2013
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