Mike,
check the web site...it also has the gas barrier bag... and RP system...
http://www.mgc-a.com/rpsystem/mgca.html
                                           jk
At 10:34 AM 8/19/00 +0300, you wrote:
>Mike
>
>The best one I've come across is a triply envelope: a very thin unplasticised
>polypropylene on the inside (to provide heat-sealing without evaporating
contaminants
>onto the contents, like PE does); the middle one is a thin Sendzimir-rolled
aluminium
>foil (to provide perfect barrier for moisture and chemical contaminants: do
NOT use
>evaporated aluminium) and a thicker polyethylene layer on the outside to
make it
>robust. Vacuum-sealing a bare PCB in that will give you virtually perfect
protection
>and conservation. We used these for individually packing m/ls and had no
blow-hole and
>no solderability problems with just Sealbrite on the copper for years (both
guaranteed
>for 6 months, provided soldered within 48 hours after opening). This was 30
years or so
>ago, when I was in charge of a PC fab shop.
>
>The bags I describe are sometimes used for the long-term conservation of
food without
>freezing, where cans are otherwise unsuitable or undesirable for whatever
reason.
>
>Brian
>
>"Mcmaster, Michael" wrote:
>
>> There's been a lot of talk about baking and packaging boards to avoid
>> problems from moisture sorption.  Does anybody have any recommended sources
>> for moisture barrier packaging for PWBs?
>> Mike McMaster
>> RF Product Engineer
>> Merix Corporation
>> Forest Grove OR
>> 503-992-4263
>>
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