At 12:03 PM 2/5/2008, Jim Lux wrote:
>Michael Keane K1MK wrote:
>
>>The other thing about using RTV is that RTV needs to be exposed to
>>moisture to cure.
>
>I believe this is only true for the one-part RTVs.. the two part
>RTVs do not require exposure to moisture, and tend to outgas less.
>
>I suppose it comes down to whether one wants caulk or a potting compound.
That's correct. A two-part RTV is needed for use in enclosed spaces
or when used as a molding or potting compound.
Because the curing proceeds from the outside in, the cure time for a
one-part RTV sealant is a (non-linear) function of thickness. A
typical RTV might cure to a thickness of 75 mils in 24 hours,
1/4-inch in 72 hours and 1/2-inch in two weeks.
With care in its application, RTV will produce a conformal seal that
can be cut and peeled off later (if necessary) just like a tape wrap.
>Either type is available from the usual mail-order sources (Newark,
>Mouser, Allied)
McMaster-Carr carries electrical-grade, one-part RTVs as well.
73,
Mike K1MK
Michael Keane K1MK
k1mk@alum.mit.edu
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