That s because in essence microwave ovens are like convenient faraday cages from which microwaves cannot escape.
Microwave hole inside glass door.
The holes are absolutely not a microwave leakage problem because they are only in the plastic inner skin and have not affected the metal screen at all.
If there is a small crack in the glass itself then you can still use your microwave.
The only bad thing they might even conceivably do is make the interior harder to clean.
Aluminum foil being metallic would help in restoring the sanctity of this cage to some extent.
Condensation water moisture may gather inside the oven inside the oven door and between the glass panels.
The glass on the door is mostly for cosmetic purposes and doesn t play a huge part in the function.
The first thing you can do is cover this hole with aluminum foil.
Posted by dakotapaul at 1 42 pm on july 13 2009.
Microwave ovens operating at 2450 mhz emit radiation with a wavelength of about 12 centimeters and the holes in the mesh of the door are typically on the order of 1 2 millimeters in diameter.
The stains are caused by grease particles reacting with the cooling air.
This means that stains and condensation can form between the two glass panels in the door.
If that is damaged then you have a problem.