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topic 59990

PEEK coating very small objects

August 26, 2015

Q. Has anyone experience with powder coating of very small objects? We have pieces of tubing with length of 5 mm and about 1.6 mm outer diameter that we want to coat outside with a layer of about 5 micron PEEK (polyether ether ketone) Melting point of PEEK is about 340 °C
We have also tubing of about 25 cm long that we want to coat inside (diameter 1 - 5 mm) with about 10-20 micron PEEK
Jan Peene

Jan Peene
- Middelburg, The Netherlands

August 2015

A. Hi Jan. To my limited knowledge, PEEK coatings are available as powders (in a good range of sieve sizes) and as wet sprayable coatings.

If the production volume is sufficient, it should be possible to build a wet coating system or a fluidized powder bed for the ODs if the volume is sufficient to justify the custom design of a vibratory feeder system such as is used in miniature assembly processes, with the tubes ultimately seated onto closely spaced pins on a custom chain.


The ID of the long thin tubing sounds difficult but you might want to talk to a PEEK supplier about the possibility of an e-coat or autophoretic PEEK coating. If that's not available or practical, perhaps a e-coating based on a different polymer could suffice. What material are the tubes made of?


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Ted Mooney, P.E. RET
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