We use heat sealed MBB's with a dry nitrogen purge during sealing.  This has
worked very well for us, and we don't have any problems with moisture
indicators showing moisture intrusion into these bags.

> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian
> Sent: Tuesday, August 30, 2005 1:31 PM
> To: [log in to unmask]
> Subject: Re: [TN] Sealer for resealing MS components...
>
> There is no easy answer to this.  A vacuum seal insures you are starting
> out with no moisture in the gas phase, but you now have quite a pressure
> differential so any leak, no matter how small, will result in moisture-
> laden air getting in.  What I don't know is how effective air molecules
> inside the bag would be in keeping out moisture as they exhibit their
> usual kinetic movement.
> Bev
> RIM
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Stadem, Richard
> Sent: August 30, 2005 1:25 PM
> To: [log in to unmask]
> Subject: Re: [TN] Sealer for resealing MS components...
>
>
> I have seen this question come up many times. There is nothing in
> J-STD-033 that addresses whether or not a vacuum seal is required, just
> that the bag needs to be sealed with Moisture Indicator Card and fresh
> dry dessicant.
> I am not sure which is better, vacuum seal or not. In the places I have
> worked, they have never used a vacuum seal, just a heat seal.
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Charles Caswell
> Sent: Tuesday, August 30, 2005 12:19 PM
> To: [log in to unmask]
> Subject: Re: [TN] Sealer for resealing MS components...
>
> Steve, I don't know about the theories about this but we just put in the
> desiccant and card, squeeze most of the air out and seal. If the card is
> good when the bag is reopened we use the parts. ( As long as they are
> within the original shelf life )
>
> -----Original Message-----
> From: Steve Gregory [mailto:[log in to unmask]]
> Sent: Tuesday, 30 August 2005 8:43 AM
> To: [log in to unmask]
> Subject: [TN] Sealer for resealing MS components...
>
> Good Day Everyone!
>
> First, I would like to offer my sympathies to all Technetters who were
> affected, or had families or freinds affected by hurricane Katrina.
>
> When resealing MS components after they've been opened, I've heard that
> it's not really necessary to vacuum seal them. In fact, that it's not
> recommended to vacuum seal them, it's better to put fresh dessicant and
> a HIC in the bag and then seal it.
>
> The reasoning is that if you pull a vacuum on the bag and seal it, the
> air inside the bag doesn't have a chance to circulate around and allow
> the dessicant to be as effective as it could be. Is this true?
>
> If so, doesn't anybody know of just a straight sealer without vacuum?
> The vacuum sealers are not cheap, and if I could find just a basic
> sealer that would be great.
>
> Kind regards,
>
> -Steve Gregory-
> Senior Process Engineer
> LaBarge Incorporated
> Tulsa, Oklahoma
> (918) 459-2285
> (918) 459-2350 FAX
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