Electronics Forum: kester (Page 31 of 51)

Selective Solder Machine Solder Balls

Electronics Forum | Wed Apr 04 08:55:45 EDT 2012 | tombstonesmt

Dave, *The machine looks to keep a steady 290c (I can confirm) *This problem is machine/product specific. We have three other Pillarhouses that run the same alloy/flux but only run this one product at this station. *The solder does have a "tail" whil

PLCC LEADS not solder in SAC305 paste

Electronics Forum | Thu Jun 28 09:54:06 EDT 2012 | mosborne1

Dave, They rework fine. All solder joints on the whole board look great especially for lead free sac305. Here are the reflow specs: SAC305 no clean solder paste – Kester EM907 Kic thermal profiling device – 50%process window green light profile. • M

Flux thinning

Electronics Forum | Tue Feb 17 09:37:16 EST 2015 | charliedci

We made the same change a year ago, from foam to spray fluxer. One of the reasons we changed, to keep the acid number within specs (foam fluxing) we had to measure once or twice a day and add DI water to make up for evaporation, all along not able to

SMT Reflow temp

Electronics Forum | Tue Feb 24 15:40:08 EST 2015 | mbartel

I'm new in this industry and need a little direction. I have a wide verity of SM parts on a board, top and bottom. The larger components have a very nice reflow, good shine. The 0402/0201's has a dull almost cold solder look. The boards function and

SMT Reflow temp

Electronics Forum | Mon Mar 16 13:35:20 EDT 2015 | swiese242

This has been a challenge for most manufacturers. It depends on board thickness, lead or lead free paste/parts. We have a slim-kic to get the profiles correct in our 14 zone oven. I believe it may be the recently posted suggestion of too much heat in

Halogen-free Solder Re-flow Quality Issues

Electronics Forum | Mon Aug 24 10:26:39 EDT 2015 | derrikf

I've recently pushed the company I work for to switch to a halogen-free solder that our supplier carries, Kester's NP 505 HR, prior we were using Kester NXG1. NP 505 HR performs great on the screen, we have a lot of down time in between prints (we d

Contamination of the cleaning agent

Electronics Forum | Mon May 09 13:55:33 EDT 2016 | dyoungquist

Omega Aqua Clean LPH. The flux we use in our selective solder process is Kester 2235. Our process cleans water soluble flux very well if cleaned within 24 hours of the boards being processed. We have sent boards off for cleanliness testing per sta

Arguments against 1(or 2)-ethoxy-propanol (aka SC01)?

Electronics Forum | Thu Jul 21 23:06:51 EDT 2016 | adamjs

Water washable no-clean flux Hrm, I have not heard of paste that is both of these things (water-wash and no-clean-safe) at the same time, at least not as a solder paste vehicle. Does Kester make one? Can you recommend a particular product (prefer

NXP QFN Solderability Wetting Problems, Kester

Electronics Forum | Thu Aug 10 10:52:11 EDT 2017 | ttheis

We are just using a stereo microscope at this time. When we first started out with these parts a year ago they filleted very well but with no apparent change they began having problems. While the boards do work, we are concerned about the long term r

NXP QFN Solderability Wetting Problems, Kester

Electronics Forum | Thu Aug 10 11:24:18 EDT 2017 | dleeper

The exposed metallization on the sides of the QFN probably aren't tinned and therefore not expected to have solder wetted to them. If previous parts formed nice toe filets, it might just be that those parts were fresher and the exposed metal did not


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