I can't help but feel that we're getting into the realms of academia here.
After we've measured the constituents on a molecular basis from a
temperature controlled environment, what do we do? Dunk it in a plastic
pot and stir as thoroughly as we can for around a minute with a wooden
medical spatula!!! I'm not a scientist, but I'll bet a pound to a penny
that that isn't sufficient to get each and every molecule of resin binding
with the appropriate molecule of hardener!! Any scientists out there??
Lloyd Owens
-----Original Message-----
From: Rowland and Wilma Carson <rowil@clara.net>
Date: 28 August 1998 00:41
Subject: Re: Epoxy/Resin Ratios
>
>> Of particular note the AEROPOXY ratios are 27:100 by weight or 1:3
>>by volume. I spent the extra and bought both a scale and a pump. The
pump
>>will save you a lot of time in the long run and provide an accurate mix
every
>>time. I am not sorry I bought the pump.
>
>Before you all rush out to buy a pump, remember that while it will deliver
>a constant ratio by volume, a change in working temperature will result in
>a different ratio by weight. It's the weight ratio that's important (so as
>to get the correct numbers of molecules interacting with each other), not
>the volume.
>
>For best accuracy (& remember, accurate measuring contributes to maximum
>airframe strength at minimum weight!) your pump should be calibrated and
>used at the same temperature. For this reason, many people like to store &
>use the pump (and the next batch of raw resin & hardener) in a
>temperature-controlled box.
>
>cheers
>
>Rowland
>
>
>... that's Rowland with a 'w' ...
>
>
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