Type of Teflon for best wear resistance

Letter 10066

Hi,

Our fan blower was Teflon coated in order to avoid the attack from acid. It is a dark colored materials but I am not sure about the precise formulation. After several months, some areas were worn away especially where the fan body was in contact with the casing(both are aluminium). I would like to know which type of Teflon coating should we choose in order to improve the wearing phenomenon.

Thanks in advance,

Ning Yang
- Chutung, Hsinchu, Taiwan

Hi Ning!

Firstly, your fan should NOT have had any areas which are touching! An absolute NO from a fan manufacturing viewpoint because no matter what 'coating' you applied, it would wear off.(The only 'touching' point would be the shaft bearings.)

Re the Teflon coating, doesn't Dupont have 6 or so so-called teflons from the top of the line PTFE downwards? I cannot answer what type of Teflon coating was used.

Which brings up, if I may, another point. Fans often have some pretty high tip speeds. Fans should not be subjected to abrasion because 'particles' would wear away the coating. That Teflon coating itself would probably be micro thin which sure doesn't help matters.

If you have an acidic condition, do two things. l) Protect the fan (via a scrubber or high efficiency mist eliminator) from attack 2) use a plastic fan!

Coating an aluminum fan is probably cheap ... but NOT in the long run if acids prevail.

Cheers!

Freeman Newton - White Rock, B.C. Canada