>> There are neutral cure silicones, they don't use acetic acid.

> Thank You Isaac. I read between the lines that acetic acid silicone use i=
s a no-no?

Standard advice  is that acetic acid cure silicone rubbers "must not"
be used in electronic circuitry.
It affects not only the in-contact area but releases AA which can
corrode other components.

Cheap neutral cure SR's are alkoxy  cure which is OK for most things
but tends to corrode bare copper. There is usually not too much bare
copper around.

Most expensive and rarer SRs use a Methyl-alcohol only release cure.
Volume released is enough to be worth ventiallting for in a production
situation but is probably 'not too bad' for one offs.

Acetoxy cure release both MA and other components.

_____________

SMD soldering - much on web and many here are far far far more expert
than I re hand soldering but, contrary to hat may seem obvious, a
large broad tip is superior for small resistor soldering.
Tin pads if needed.
Place resistor with contacts touching pads but located on the side of
pads away from iron.
Place broad iron tip on both pads at once so solder melts at about the
same time om each and wave of melt will propagate across pad to far
side where resistor awaits.
Resistor will now pull itself into position.
Any technology sufficiently advanced is indistinguishable from magic.
In this case it's surface tension doing the magic.

The resistor gets a relatively gentle ride as the hot solder comes to
it and draws it into the hotter area.


         Russell
--=20
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