Re: Microwave Epoxy set in the bottle?

On Jun 27, 12:25 am, "Doug McLaren" <dougmc
+usenet-20070...@xxxxxxxxxxx> wrote:
In article <1182902796.742996.206...@xxxxxxxxxxxxxxxxxxxxxxxxxxx>,

<b...@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.

--
Doug McLaren, dou...@xxxxxxxxxxx
They say only the good die young. If it works the other way, I'm immortal.

You are correct that water has a very, very wide and strong absorption
band. But most organics absorb very poorly at the frequency used in
microwave ovens. Just do a simple test. Put a cup of water and a cup
of cooking oil in your kitchen nuke. Run the nuc until the water is
boiling. Now check the temp of the oil. It will be barely warmer
then when you put it in.

I would expect epoxy to behave much more like oil then water in a
kitchen microwave as chemically the bonds in the epoxy are much like
those in cooking oil and not at all like those in water. If you used
the right frequency I am sure you could heat either oil or epoxy just
fine in a microwave but the commercial units are not tuned to those
frequencys.

.

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