6 Apr
2011
6 Apr
'11
11:05 p.m.
I can rember my Father who was an apprentice refridgeration engineer in the
1930's saying that they used trichloroethane (AKA Trike) to degrease
compressor parts. The only problem was that when heated it turned into
Posgege gas as used in the first world war and they all smoked in those
days!
Asked what they did. He said if they felt a bit woozy they went outside for
a while and sat on a bench in the local graveyard just across the road!
Rod Smallwood
?
-----Original Message-----
From: cctech-bounces at classiccmp.org [mailto:cctech-bounces at classiccmp.org]
On Behalf Of Pete Turnbull
Sent: 06 April 2011 19:45
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Advice on Lisa 2 restoration
On 06/04/2011 13:11, Steven Hirsch wrote:
The only place I've seen this is in the form of
"Rubbing Alcohol" which
tends to be 65-70% concentration. Is that sufficient and/or safe to use
on electronic parts? Can anyone in the states recommend a good source
for larger (e.g. gallon) quantities of 99% propanol?
It might be good enough, but "rubbing alcohol" can be many things, many
of which are not isopropanol. 99% isopropanol won't stay 99% for very
long unless very carefully stored; it slowly absorbs water from air and
ends up about 90%.
Others have recommended Perc. Unless I'm
confusing that with something
similar-sounding, it's seriously nasty stuff. Back when flux remover
actually worked, it was perc based. The EPA has clamped down on the use
of perc, although I think it's still a component of "dry" cleaning.
Over here (UK) all the common flux removers we used to use were based on
1-1-1-TCE (trichloroethane). Not quite as horrible as PERC
(tetrachloroethylene) in many ways but now banned, while (to my slight
surprise) PERC isn't.
--
Pete Peter Turnbull
Network Manager
University of York