Stefan Trethan wrote:
>
> I expect it is similar to liquid gasket from auto stores, as long as it is
> high temp (200C+), however i bought it as high temperature silicone.
>
Have some in the US that is black in black tube, for making formed gaskets in
the higher temp areas of the engine. Pretty damn hard to see toner on it though
I bet.. :)
>
> What i noticed is that this one seems to have more acetic acid than my
> normal silicone. You can't keep your head close when spreading it. But i
> do not think this is important, it appears the lack of breakdown in the
> fuser is what makes it work. (It cures very fast tho)
>
More solvent to keep it more liquid, takes more solvent for denser materials.
The normal stuff dries out and shrinks with heat, losing seal. The black is
more dense and solid on initial drying, so there's less to shrink.
I've never seen a melted silicone gasket, at least certainly not at any sort
of reasonable temp like 400 + F that you sometimes see in engines. It dries out
and gets hard with heat and leaks not soft is the problem, I wouldn't expect
just a fuser pass is melting it. For that matter I've used it in solder bath
before as an emergency replacement for latex mask, but not there for long so not
100% sure it couldn't melt at 700 deg or something..
The normal stuff still works ok as gasket in high temp areas if you have good
surfaces and it's under compression, it just doesn't stay pliant enough so you
have more of a tendency to leak in the long term.
PS This all reminds me, put a peppermint in the oven sometime. With the
oils boiling and sugars cooking it foams and carbonizes, producing a light
fluffy solid black cloud-like object that hardly seems right weight to volume
wise, and really doesn't look like it would have come from the mint you started
with. Used to work at Dominos, with always on ovens and mints and a little too
much time..
Alan