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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Interesting process to remove 'sunburn' from plastic cases
"Fascinating" -- as Spock would say.
Two points... First, the process /is/ patentable. Perhaps he meant that, for some reason (perhaps other people did most of the work), he and his cohorts could not patent it. It's possible that that there's enough prior art to prevent this process from being patented. Hydrogen peroxide has been used as a bleach for a long time, and the addition of a thickening agent and an activator such as "Oxy" may not be sufficiently novel to allow for a useful patent. Second... Since when is hydrogen peroxide a hazardous substance (in the US, anyway)? When I use mouthwash, I add a bit of peroxide. My mouth is in fine shape. It's really a matter of concentration. Household hydrogen peroxide is only a 3% solution (in water). Even at that concentration, it's strong enough to "burn" the mouth tissues somewhat if you use it right out of the bottle. I usually dilute it 1:1 with tap water or mouthwash, so the resulting solution is only 1.5% peroxide. In higher concentrations, hydrogen peroxide can be distinctly hazardous. It's an oxidizer and (as a result) a bleach, and when brought into contact with oxidizable materials it can result in a sudden chemical reaction that releases a lot of heat. And, as noted in the retr0bright pages, it can cause chemical burns all by itself. If you splash the 12% stuff around, and get a drop in your eye, you'll probably be in a world of hurt (literally). -- Dave Platt AE6EO Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
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