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

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


White residue inside the reflow oven

Views: 1859

#40923

White residue inside the reflow oven | 11 April, 2006

Hi SMTnetters, I have a white residue coating all over my reflow oven innards (almost looks like white fungus). How can I absolutely be certain that it’s flux and not anything else?are there any tests available for this? I am planning to check the oven exhaust for correct air flow rates…..anything else I should be looking out for? We are using a water soluble halide free flux and SnPb solder

Thanks in advance for your collective wisdom

Amol Kane

reply »

Slaine

#40954

White residue inside the reflow oven | 13 April, 2006

I had something similar a while back it looked like fibreglass insulation in my case (was using no clean flux not water based), i took some and melted it with a soldering iron and it reacted like flux. and i tried disolving it with acetone.

reply »

#40955

White residue inside the reflow oven | 13 April, 2006

did you manage to get rid of it? if so, what steps did you take to eliminate it?

reply »

#40958

White residue inside the reflow oven | 13 April, 2006

Do a FITR analysis of this white material to help direct you in eliminating the choices. What do your paste and board suppliers say?

reply »

#40961

White residue inside the reflow oven | 13 April, 2006

I will be sending them the sample for analysis friday. hopefully that should shed some light on the subject

reply »


RDR

#40964

White residue inside the reflow oven | 13 April, 2006

I have always attributed to flux and "lint".

reply »

#40966

White residue inside the reflow oven | 13 April, 2006

lint from what?...also roughly how often do you clean the oven? (not the heated chamber) but other areas to keep them clean? The operator say he has had to do it twice in 2 weeks to keep it clean due to the residue

reply »


RDR

#40968

White residue inside the reflow oven | 13 April, 2006

lint from the factory conditions, enviromnent you know.

We clean every 6 mos. you seem to be accumulating quite rapidly. unless you are cleaning at the first spec of this showing up

reply »

Slaine

#41018

White residue inside the reflow oven | 18 April, 2006

we didnt see it as a potential risk, main accumilations we around the entry and exit curtains so we lived with it and cleaned (quick wipe with acetone) once a week.

reply »

reflow oven profiler

Reflow Oven