24 Oct
2011
24 Oct
'11
9:58 a.m.
On Mon, 24 Oct 2011, Richard wrote:
There's no evidence that the problem is the result
of mold, fungi, or
other living organisms. It is most likely chemical decomposition of
the material used to fill in between the tube and the safety shield.
Exactly.
It is probably just releasing some gas as a result of
it
decomposition and creating bubbles in the material.
I've done the procedure of removing the shield from an HP2648 terminal,
I've used the hot wire method. I can assure you that the spots are neither
living organisms nor gas bubbles, you'll feel a hard resistance trying to
cut through them. Those spots are hard globules, just like small plastic
balls. Somehow the "silicone" (or whatever the material is) hardens and
gets white, forming those spots. Perhaps there are impurities in the
material that cause a crystallisation of the filler material.
Christian