Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Zero flux or paste spattering?

tommy

#26816

Zero flux or paste spattering? | 10 January, 2004

Is it possible to have zero flux or paste spattering for all smt reflow pcbs. We are seeing around 0.4% of flux spattering and looking forward to zero defect.

reply »

Hussman

#26827

Zero flux or paste spattering? | 12 January, 2004

I don't believe you'll get an exact zero flux with no-clean pastes. Water soluable yes, but I don't see it happening with no-clean; at least not this year. As for spatter, you should be able to control this. Can you define what you call "spatter"?

reply »

tommy

#26887

Zero flux or paste spattering? | 14 January, 2004

We see spattered(spitting of flux or solder to nearby area) solder/flux on gold fingers.We view the gold fingers area under 30x before reflow and it is cleaned but after reflow we see flux droplets or solder on gold fingers. We tried to changed a new jar of solder paste,other brand of solder paste,increase the soaking time and temperature,change to linear ramp up profile,clean the reflow oven and we are still seeing 0.4% rejects due to spattering.

reply »

#26890

Zero flux or paste spattering? | 14 January, 2004

Search the fine SMTnet Archives for background on solder on gold fingers. As we recall: * Paste selection * Proper reflow recipe tuning

... are important.

reply »

Facility Closure

 Reflow System