Good Morning Steve,
Are all cards from the same supplier? Were all three cards sitting in the
same area of the room, like next to each other, or were they spread around?
Think of a room like a big environmental chamber. If the cards were in
varying locations then it could be possible for there to be variation in
humidity. We have mapped chambers before (much smaller rooms) and you can
get a huge variation in the humidity from one area to another based on air
flow. So it may be possible if the cards weren't all in the same area. If
the cards were in the same location, then the results you're seeing could be
suspect. The question is which one is correct? I don't know an answer.
You might contact the supplier(s) and ask for any testing that was done
showing that those lots represented in the photograph were good.
Best Regards,
Joe Russeau
-----Original Message-----
From: Steve Gregory
Sent: Monday, April 23, 2018 11:25 AM
To: [log in to unmask]
Subject: [TN] HIC Card validity?
Morning all,
I have a question regarding HIC cards. We have one style here in our stock
room that we have new in a can. Last Thursday when it was 77% relative
humidity, you could take one of the HIC cards out of the can (it was the
lower right hand card in the photo) and literally watch the 5% & 10% dots
turn pink within 20-minutes. So according to the card, if a sealed MBB that
contained MSL3 parts was opened, and 20-minutes later both dots turned pink
I would have to bake the parts, correct? The problem with that is that the
bag was only opened for 20-minutes, not 168-hours. I'm just asking the
question the same way a stockroom clerk would ask it. What are they
supposed to do when they see a pink card?
http://stevezeva.homestead.com/HIC_Cards.jpg
BTW, all three cards have been sitting out all weekend and came in with
bare PCB's and other parts that we received in. I know the humidity has
been at least 77% over the weekend, and it's 57% this morning. All the dots
on all the cards should be pink, correct? How much faith do you put in the
HIC cards when you see this kind of variability?
Steve
--
Steve Gregory
Kimco Design and Manufacturing
Process Engineer
(208) 322-0500 Ext. -3133
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