Re: Teflon - not so inert!
- From: Gregg <nospam123gcrume@xxxxxxxxxxxxxxx>
- Date: Tue, 12 Jun 2007 23:51:29 GMT
rekuci@xxxxxxxxx wrote:
There are all different grades of "Teflon" that have varying levels ofIt's been a while since I worked with Teflon coatings, but a coating is typically 3 layers,
fluorination to improve manufacturability. For example, Teflon FEP is
a "fluorinated ethylene propylene resin", as opposed to Teflon PTFE
which is well..PTFE.
But anyway, I've observed that pure PTFE absorbs significant
quantities of water...and who knows what's in the pigment.
A bond coat, a pigment or black coat and then a translucent top coat for the majority of the protection.
Each layer was a different grade to optimize the bonding or chemical resistance.
The bond coat I saw was green when fired. If no intermediate coat was applied before the top coat, the finished coating was green.
Just an FYI, We also had jigs that were made by plasma spraying a base coat ceramic on AL and then the "mostly" PTFE coating impregnated the porous ceramic. This made a very abrasion and chemical resistant coating.
Gregg
.
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