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= --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------