On Apr 5, 5:09 pm, wrote:
On 5 Apr, 21:19, " wrote:

b) conversely and more likely, the prep-work took the microwave-
reflective primer off and exposed the steel. BAD MOVE as without that
reflective coating the metal will get very hot no matter what sort of
finish coating may be on top.

Just my random thoughts.

Peter Wieck
Wyncote, PA

Does anyone agree with this?

To understand what the walls of the oven are made of or what material
one could use to partially keep food from cooking, you have to have
some knowledge of 'dielectric constant' and 'loss tangent'. The
materials used for protectors can be plastics, ceramics.... all
depends on the dielectric constant and the RF properties at 2.45 GHz.
The walls are usually a light sheet metal (or plastic with a layer of
metal foil) with a dissipative coating.

from: Ronna Erickson
Radio Astronomy, Univ. of Mass. - Amherst

Remove that dissipative coating and Bob's your Uncle...

In any quality oven, that coating is fired enamel and pretty tough. In
the cheaper versions, it is a powder-coating that is fragile at best
if abrasives are used to clean. On some others, it is back-coated onto
a tough plastic... That is the hardest to damage.

Peter Wieck
Wyncote, PA