Electronics Forum: storing solder paste

Criteria for storing finished SMT assemblies, shelf-life?

Electronics Forum | Thu Sep 11 14:20:07 EDT 2008 | pcbrown57

Is there any criteria or limitations for SMT pcba's? We have boards in stock that we built and a customer wants to know what our procedure is for "storing" these boards which will have a few through-hole modules soldered to them after they get pulled

Criteria for storing finished SMT assemblies, shelf-life?

Electronics Forum | Fri Sep 12 08:01:55 EDT 2008 | davef

There is no standard. On the web, you can find shelf life estimates for various types of solderability protection on bare boards. These estimates won't translate directly to the storage of assembled boards, because assembled boards [and the solderabi

solder paste

Electronics Forum | Thu Dec 10 09:06:47 EST 2009 | stepheniii

Just how cold do you store your paste? And what are your solder paste reps like? Here they fall over each other giving support for their paste. And have you seen the problem with flux separation or have you only heard about it?

solder paste

Electronics Forum | Thu Dec 10 12:53:12 EST 2009 | deanm

Bryan, Dyoungquist is correct. You should not need to mix solder paste. Overmixing solder paste can adversely affect it. Follow these guidelines and you should be fine: 1. Keep unopened containers of paste in the refrigerator. 2. Take one container

solder paste

Electronics Forum | Wed Jul 27 09:58:05 EDT 2011 | davef

Pressure printing systems Conventional stencil printing techniques have fundamental limitations as regards paste handling: The volume of paste available for printing is limited, so frequent replenishment is necessary Paste is difficult to c

voids in solder

Electronics Forum | Tue Mar 06 14:10:52 EST 2001 | CAL

Are the voids in the balls of a BGA? Are you verifying this through x-ray if they are? some voids depending on size and location are some what accepted. Solder paste type? Solder paste date code? Humidity high? PCB's been stored in a truck trailer?

cleaning wave solder pallets

Electronics Forum | Tue May 16 15:30:07 EDT 2006 | George

Hi John, Are you talking about cleaning the pallets after running to store them? or during production? well in any case...I recently started to use this cleaning solution "Cybersolv" from Kyzen. It is water soluble and also can be used instead of IP

Peelable solder stop

Electronics Forum | Wed Dec 23 03:33:14 EST 1998 | Charles Stringer

Can anyone recommend a solder stop that can be applied by our PCB supplier. Our current material form Tamura Kaken is causing problems. The material should be capable of withstanding 1 Surface mount IR reflow cycle and 1 wave solder cycle. We need t

expired solder paste

Electronics Forum | Fri Apr 04 08:49:45 EDT 2008 | ck_the_flip

Define "expired" though... 1 week? 6 weeks? 1 month? 6 months? Unrefrigerated life is generally 30 days. If paste has been stored refrigerated at manufacturer recommended temperatures, what would you guys do, like say, if you owned your own shop

solder dispencing vs printing

Electronics Forum | Thu Jun 21 22:04:18 EDT 2001 | davef

This is my attempt at beating the "Fuzzburg 7" translator used on the SMTnet Forum that mashes everything it sees. Below the next paragraph are three paragraphs,each with a common numering sequence, where each paragraph represents the columns of a t

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