Re: Microwave Epoxy set in the bottle?



Doug McLaren wrote:
In article <1182902796.742996.206290@xxxxxxxxxxxxxxxxxxxxxxxxxxx>,
<bm459@xxxxxxx> wrote:

| But microwaves are tuned to the water frequency.

That is a common misconception. Microwave ovens are generally tuned
to a frequency right in the middle of the 2.4 GHz ISM band, yes, but
there's nothing special about exactly 2.45 GHz with regard to water.

Yes, 2.45 GHz radio waves are absorbed by water, but higher
frequencies are absorbed even better. 2.45 GHz is not a `water
frequency' (not any more than any frequency from 2-1000 GHz, anyways)
or an absorption peak or anything like that. Basically, it's a
compromise between `not being absorbed enough' and `being absorbed too
quickly'. That, and the FCC (and the equivalents in other countries)
have allocated this band for this sort of use.

Pretty much any frequency from 0.9 GHz to 10 GHz would probably work
OK for a microwave. Even higher frequencies would work, but your food
wouldn't be cooked very deeply (as it would all be absorbed by the
outer layer of the food.)

Industrial microwaves often work at 915 MHz -- the middle of another
ISM band. The lower frequency is not absorbed by water as well as 2.4
GHz is, so it ought to be able to cook larger items more deeply than a
2.4 GHz microwave oven could.

| Epoxy does not have water in it unless you put some in there.

Right. I've no idea how well epoxy would absorb microwaves --
probably not well. The idea to heat it up in a glass of hot water is
a good one.

I have heated epoxy in the microwave many times and it heats faster than water. Never a problem with putting the bottle in the microwave.

.

Relevant Pages

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