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Subject:	Re: Moisture Barrier Bag WVTR
From:	Brian Ellis <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Sat, 2 Jun 2001 16:40:48 +0300
Content-Type:	text/plain
Parts/Attachments:	text/plain (46 lines)

You need triple layer bags: PE outside, then Al, then PP inside.

Brian

Nancy Reynolds/MKT/HQ/KEMET/US wrote:
>
> Hi TechNetters,
>
> Archives show that this question has been asked several times over the last
> year, but I find no answers...
>
> IPC/JEDEC J-STD-033, dated May 1999, states the WVTR for MBBs must be
> <=0.002 g/100 sq inch in 24 hours at 40C. I can find bags that meet <= 0.02
> g/100 sq inch, but nowhere have I found a bag at 0.002.  Is this a typo in
> J-STD-033?  And if not, can anybody tell me where to look for bags that
> meet this requirement?  Should I assume the formula for calculating how
> many desiccant units are required is correct as stated?  Sure is a lot of
> desiccant if the actual WVTR is 0.02 g/100 sq inch.
>
> TIA
> Nancy
>
> Nancy Reynolds
> Product Manager
> KEMET Electronics=
>
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