On Oct 23, 7:11 pm, Gregg wrote:
John Kuthe wrote:
On Oct 20, 9:43 am, Wilko wrote:

Gregg wrote:

I hope this information helps to satisfy your curiosity ;-)

Thanks Gregg, that was interesting to read!

--
Wilko van den Bergh wilkoa t)dse(d o tnl
Eindhoven The Netherlands Europe
---Look at the possibilities, don't worry about the limitations.---http://kayaker.nl/

Very interesting! One question though. When you said:

A base coat which was a polymer mix to adhere to the sand blasted and

etched pan surface, a second coat of PTFE with decorative speckles
(and/or pigments) and a clear over coat of translucent PTFE

This looks like it means the surface of Teflon cookware coating is
this "clear over coat" rather than the PTFE. So how does the extremely
low friction coefficient of the PTFE come into play if it's covered
with a "clear over coat"? Seems it would be the friction coefficient
of the "clear over coat" that would interface with the food products.
Plus how do they get this "clear over coat" to adhere to the PTFE, if
it's the PTFE that has the extremely low coeff. of friction? I know
it's hard to get paint to adhere to most plastics, of which PTFE is (a
plastic.)

Seems the original fundamental question still remains!

John Kuthe...

Hi John,

Sorry for the confusion
The base coat is a PTFE + second polymer mixture (I can't recall what
the blend is)
The Second coat is PTFE + Pigment
and the top (clear) coat is just PTFE which is translucent.

It's a 3 coating system, but all the layers have PTFE

The PTFE comes in an emulsion form- (small droplets of PTFE suspended in
a carrier fluid). All 3 layers are applied by spraying. The pan is baked
to cure the Teflon only after all three layers have been applied.

The emulsion is formulated so a wetting agent (or detergent like
chemical(s)) wets both the small PTFE particles and the suspension
fluid. This keeps the PTFE in suspension. - like homogenized milk (which
has fat suspended in water)
I imagine that the formulation of these emulsions are no easy task, the
wetting agents must wet PTFE and burn out completely before the Teflon cures

Thanks Gregg! I'm sure there's a ton of cool polymer and adhesive
chemistry going on to get the world's slipperiest substance to stick
to cookware and prevent foods from then sticking to the cookware.
Thanks for the explanations.

John Kuthe...