Electronics Forum | Sun Feb 20 20:52:26 EST 2011 | Jacki
I agreed not to ask the shelf life extension to the maker of solder paste. However, somtimes we have no chioce except using expired or used paste. When I have to, try the first PCB as a test. If Ok, just carry on other boards. Unless, use a new solde
Electronics Forum | Sat Feb 19 10:27:38 EST 2011 | kahrpr
Just a thought. What is the real shelf life of the past? Do manufactures low ball the self life to sell more paste. If the past is perfectly good one day before the expiration date is it still bad one day after I doubt it. Right or wrong I have seen
Electronics Forum | Wed Feb 23 07:36:22 EST 2011 | scottp
We have a new site that is in the process of starting up and doesn't run much (1 tube every couple weeks). They recently called me about using expired paste. I told them to print a few scrap boards and run them through SPI to verify good print and
Electronics Forum | Wed Feb 23 00:45:49 EST 2011 | tsvetan
Does someone with technical knowledge knows what exactly happend with the solder paste after the shelf life pass? What we have seen is sometimes flux separation which disapear after a good mix, and change of viscosity i.e. drying. The tin, silver and
Electronics Forum | Thu Feb 24 22:32:56 EST 2011 | rstadem
PKannan, Your opinion is contrary to J-STD-005 "Requirements for Soldering Paste". Within that document is included specific requirements for re-certification of expired solder paste. Paste that is expired can be used after a simple viscosity test an
Electronics Forum | Wed Feb 23 03:12:25 EST 2011 | pkannan
You are very right. There are 2 major factors 1) There is going to be Flux separation. This is basically due to fact that metal particles are heavier than the Flux vehicle system, and due to gravity effect they slowly drift downwards leaving the ligh
Electronics Forum | Wed Feb 23 03:22:47 EST 2011 | pkannan
(Corrected the Subject line - sorry for Spelling ) You are very right. There are 2 major factors 1) There is going to be Flux separation. This is basically due to fact that metal particles are heavier than the Flux vehicle system, and due to gravity
Electronics Forum | Fri Feb 25 02:30:32 EST 2011 | pkannan
Dstadem, Thanks for bringing your in valuable experience with the J STD 005 " Requirements of Solder Paste". I fully agree with you that the Solder Paste can be qualified for shelf life by doing simple viscosity test and visual inspection for coal
Electronics Forum | Fri Feb 18 11:24:52 EST 2011 | pkannan
The following is my opinion on the Shelf life of the Solder paste. Comments are welcome to support or against it. Solder Paste users often have the issue of Shelf life expiry condition. Companies including big MNCs, order certain quantities, but du
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