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PTFE/Teflon Coatings For Stainless Steel Medical Band

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waynethepain

Industrial
Mar 2, 2011
21
GB
Hi All,

I want to add a PTFE coating to a formed medical band. My question is can I treat the strips before or after forming? I would want to do them before as it would be easier, but I am concerned the coating may crack.

Notes:
The band does come into contact with the body.
The single units are quite small 87mm by 6mm.
The form is a slight concave curve in the centre approx 10mm by 6mm.

Thank you in advance.
Wayne.
 
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Pure PTFE, if as thin or thinner than the band, won't crack, it will just yield. The stainless band would crack first.
 
Pure PTFE has very little mechanical strength and is easily displaced. If it were applied to a steel strip surface prior to a forming operation, the PTFE coating would likely be damaged and/or contaminated beyond what would be acceptable for your medical device application. Form the metal part first, chemically clean/etch the metal part surfaces, then apply the PTFE surface coating.
 
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