I agree with Mike.  Biggest concern is a significant drop in activity.   Coalescence of the solder paste  into a single large ball when reflowed  on a  non-solderable  surface such as  a ceramic plate would  be a good start. One nice solder ball is what you're looking  for with minor if any adjacent solder fines not coalesced into  the large single ball.  If it looks good, I would still only keep it for about 25 % of its stated shelf life. 

Rich  Kraszewski /Plexus 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Leland Woodall
Sent: Friday, June 05, 2015 12:06 PM
To: [log in to unmask]
Subject: [TN] Solder Paste Question

Everyone,

We just received 25 tubes of solder paste that got misplaced by the carrier and was delivered in 6 days instead of the usual two.  When it arrived it was warm to the touch.

We performed a viscosity test after allowing it to stabilize to ambient, and the readings returned were within spec and very close to our typical results.

Is there any danger in using this shipment?

Thanks for your help!

Leland

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