BTW the item you are referring is normally made of sheet mica, and is placed
at the junction of the wave guide and cooking cavity. As stated it elimnates
spalshes of material from reaching and coating the magnatron, burning there,
and eventually destroying it.
"Doug" wrote in message
oups.com...
it protects the magnetron . Protects it from moisture and grease.
best to replace it . contact local appliance parts house or AMI
http://www.amiparts.com/