[time-nuts] wwvb weak on east coast especially when the pre-amps under wa...
GandalfG8 at aol.com
GandalfG8 at aol.com
Tue May 15 09:08:21 UTC 2012
I really don't know who actually made it, what we generally used came from
RS Components as an aerosol spray and Farnell carried a similar product.
It was an RS "own brand" product, indicated as suitable for protecting
circuit boards and probably marked up as something exciting, like "printed
circuit board spray":-)
I've just checked the RS web site and can't find anything similar to what I
remember, but it was quite a long time ago, probably over thirty years
ago when I first specified it and at least ten since I had any involvement.
I wasn't looking to satisfy any particular requirement other than my own
specification, there was no certification or compliance requirement in this
instance so using a generic product wasn't an issue, but it checked out ok
and, on some sites at least, the protected boards would have run
continuously for 20 years plus, so I guess it did a reasonable job:-)
Anyway, we've rather drifted off topic again and I wasn't intending to do
that, but it's good to hear that Paul seems to be close to up and running
again.
regards
Nigel
GM8PZR
In a message dated 15/05/2012 08:07:12 GMT Daylight Time, attila at kinali.ch
writes:
On Mon, 14 May 2012 19:01:55 -0400 (EDT)
GandalfG8 at aol.com wrote:
> I can't remember now exactly what this stuff was called, but it was
> readily available in the UK from both RS and Farnell as an aerosol
plastic spray
> that provided a good barrier but was a bit more flexible than the usual
MOD
> spec conformal coatings.
> It melted easily under a soldering iron, albeit with a foul pong:-), so
> reworking was no problem, and resisted moisture remarkably well.....
Do you mean "Plastik 70" or "Urethan 71" from Kontakt Chemie?
At least that's what we use when we do not have high requirements.
For implants we usually use a parylene coating, which does a very
good job in keeping the moisture out that the epoxy lets trough.
Attila Kinali
More information about the time-nuts
mailing list