Which is a good practice anyway. You should never mix paste that has been sheared on the printer or exposed back in with good paste, as their rheologies are now completely different. Dispense only enough to print a few assemblies at a time and properly discard the remainder when finished. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian Sent: Thursday, November 10, 2005 2:48 PM To: [log in to unmask] Subject: Re: [TN] Solder paste control Yannick, Jeff is right. AND if you have a rule that anything left at the end of the shift/day (depending on what the supplier provides) on the stencil is tossed, then you should be able to convince your ISO guy. Bev RIM -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Jeffrey Bush Sent: November 10, 2005 3:35 PM To: [log in to unmask] Subject: Re: [TN] Solder paste control You supplier should be able to give you both the shelf and pot life of the paste. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Yannick Brisson Sent: Thursday, November 10, 2005 2:57 PM To: [log in to unmask] Subject: [TN] Solder paste control Hi, I had a question from our ISO guy asking me how I know that the paste we use is in good condition? The problem is that he saw our operator put some old paste back in a empty jar to reuse it the next day. So his question is how do you know the paste has been on the stencil below the maximal hour wrote in the datasheet? Do you know any measure than I can take to certify that the paste in good? like viscosity or something else? And how I do that? Because I'm pretty sure that is next question will be how I know the new paste we just receive is good too. 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