On Sun, 2003-12-07 at 02:13, John Carmack wrote:
> I would strongly urge anyone working on peroxide concentration to start
> with unstabilized semiconductor grade. The past several years have clearly
> shown that making your own rocket grade peroxide with consistancy in usable
> quantities is not as easy as many people have assumed it to be. Removing a
> significant aspect of the process is easily worth doubling the price of the
> feedstock.
That only eliminates a significant aspect of the process if you are
satisfied with 85% or so maximum concentration. In order to go higher,
you need to freeze it anyways, and that removes the contaminants along
with almost all of the rest of the water.
-p
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