Electronics Forum | Mon Dec 17 08:34:58 EST 2012 | emeto
I would scrap it. As you said part of it is going to be old paste. All manufacturers don't recommend mixing old with new paste because you change the rheology of the paste.
Electronics Forum | Sat Dec 15 06:34:54 EST 2012 | sowmya
Normally paste manufacturer specifies stencil life of a paste is 10 hours. the question is, if i run a continuous manufacturing for 40 hours, we will be adding 250 g of paste for every two hours. The addition of 250 g will be mixed with the paste whi
Electronics Forum | Wed Jan 10 09:30:23 EST 2018 | buckcho
Hello, which type solder paste are you using?
Electronics Forum | Thu Jan 11 11:29:58 EST 2018 | mohammad
I use this one Chip Quik Inc. SMD291AX250T3
Electronics Forum | Sun Jan 07 08:46:08 EST 2018 | spoiltforchoice
Your paste should specify a number of times it is OK for various things to happen. The two you might care about are the "Stencil Time"/"Working life", which is how long the paste can be out of the pot on your stencil while you print PCBs. The othe
Electronics Forum | Sun Jan 07 07:40:31 EST 2018 | mohammad
Hi everybody. I'm new at SMT soldering. I'm using a stencil to print solder paste on PCB. and my board has 0402 components that it make assembling process long so I can't complete a set of board in a day and I have to continue in the next day. what
Electronics Forum | Tue Jan 23 02:50:57 EST 2018 | buckcho
8 hours @ 20-50% RH 22-28°C (72-82°F) >4 hours @ 50-70% RH 22-28°C (72-82°F)
Electronics Forum | Mon Jul 26 20:57:55 EDT 2010 | davef
It depends. Read "Evaluating Solder Paste - not an Option" by Phil Zarrow, ITM Consulting
Electronics Forum | Mon Jul 26 20:31:59 EDT 2010 | engr
When hand placing SMT components what is the working time before the solder paste become unusable (dry)?
Electronics Forum | Tue Jul 27 08:03:55 EDT 2010 | scottp
You have to figure this out for yourself for your paste. When I evaluate solder pastes I require good tack, no solder balls, and proper wetting after 4 hours at "reasonable" ambient conditions. I also print boards and put them in a temp/humidity ch
