As long as the metal grid, the door seals, and door latch were not damaged,
there will be no radiation leakage. But, I would replace the front glass to
prevent moisture build-up in the door. Moisture in the door may cause some
extra loading on the emissions, thus lowering cooking efficiency. Depending
on the door design, this may also cause some reflections, thus without doing
any type of testing, there is no accurate way to make an accurate assumption
to what is really going on.

Using tape may be a problem. The microwave radiation may cause the glue on
the tape to start cooking, and also give off fumes that may not be healthy,
or simply melting the tape, and making a bit of a mess.

Maybe a non corrosive silicon type rubber may be okay to patch the glass,
but this should really be checked out to know if its chemistry is safe to
use in a microwave environment without giving off fumes, or any type of
emissions that would be dangerous for the food, or for the people in the
room where the air is blowing out.

Personally, I would order a new glass (door window) and replace it. This way
you will know that it will be properly and safely serviced. You may have to
replace the complete door, depending on the manufacture's parts policy.

--

Jerry G.
======


"Hmmmmm" wrote in message
...
So in our microwave there is the outer glass, then the metal grid, then a
layer of clear plastic over the grid. .

For nondisclosed reasons, there was a metal object inside and it sparked, a
spark flew to the plastic which melted.. The metal grid is ok.. But there is
small hole
in the inner plastic..

When I microwaved a glass of water some water vapour came through the small
hole and condensed on the outer window..

Is the microwave safe for using?

I think it is but my wives father claimed it is not..

Again, the metal grid is ok..

Anyone know?