[CentOS] died again
John R Pierce
pierce at hogranch.com
Wed Dec 4 20:49:30 UTC 2013
On 12/4/2013 10:44 AM, Warren Young wrote:
> Bottom line: 70% is too impure for this task.
Huh?!? I've cleaned numerous CPU-heatsink surfaces with 70% isopropyl,
never had any problem.... heck, I clean optical lenses with it, in the
form of those eyeglass wipes you buy by the crate at Costco.
in tests we did 30 something years ago, the 90% medical stuff left a
white haze, while the 70% regular rubbing stuff didn't. we were using
it for cleaning the heads and tape paths of 9 track computer tape
drives. sure, the analytic laboratory grade was clean, but also
stupid expensive, as we were going through a quart a week cleaning a
dozen high speed tape drives 3 shifts a day 6 days a week (they were in
constant use loading tapes shipped to us from vendors, so got rather
dirty rather fast).
john r pierce 37N 122W
somewhere on the middle of the left coast
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