On Thu, 18 Jun 2009, Horace Heffner wrote: > The price of CR-39 is quite bothersome for amateurs like me though. > It would be good to find a cheaper alternative!
I have a couple pounds of it, 1.5mm thickness, unknown age. I only just started playing. I found that you can't mask it off with scotch tape during etch, the adhesive dissolves. Also it seems to etch asymmetrically unless the chips are positioned vertically in the bath. The samples I tested have 50-100 tracks per mm^2. Gonna try resetting the latent tracks by heat soak above 100C, or even melt some. Polycarbonate is also said to work. Originally discovered in Apollo crew helmets, Lexan? (((((((((((((((((( ( ( ( ( (O) ) ) ) ) ))))))))))))))))))) William J. Beaty SCIENCE HOBBYIST website billb at amasci com http://amasci.com EE/programmer/sci-exhibits amateur science, hobby projects, sci fair Seattle, WA 206-762-3818 unusual phenomena, tesla coils, weird sci
