J-STD-033 has the "derating" tables you're looking for.

-----Original Message-----
From: Bob Perkins [mailto:[log in to unmask]]
Sent: Monday, February 11, 2002 3:54 PM
To: [log in to unmask]
Subject: [TN] FW: Moisture Sensitive Devices



Hi all,

 Regarding moisture sensitive devices, all the levels I see are  in respect
to  <=  30c 60%RH.  The time specified for these levels are clear but what
if I am dealing with 30%RH.  Is there a sliding scale that is applied to
this level of humidity or do I strickly go with the times given at 60%RH..
ex. The level 5 component has 48 hours, would that be 96 hours on my
production floor if I'm at 30% RH ?

Thanks
Bob  P