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Old 06-09-2019, 05:49 PM   #81
diif
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Default Re: Does flux expire ?? Flux discussion.

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Originally Posted by RJARRRPCGP View Post
Is that a counterfeit flux?
Sure is. Mine is about 3 years old and has the same Lot# as half of those sold today. It's like a copy of a copy of a copy. A bit pot luck how good it is, some stays thick longer than others.
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Old 06-09-2019, 06:01 PM   #82
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Default Re: Does flux expire ?? Flux discussion.

Coliformia is the state made of colifony of course <BOOO! HISS!>
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Old 06-14-2019, 06:45 AM   #83
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Default Re: Does flux expire ?? Flux discussion.

Remember that can of polish flux ? The one I said I had no idea what it was called because the sticker was on the bottom ? Gave it a whirl today and it was....meh. I had to reflow some connections on a QFP and a USB mini-B connector. It went...mediocre at best: solder blobs everywhere and the flux seemed to dry rather quickly. The tip I used was the bevel one (slanted) and it seem to go worse than the T-IS (curved) one, so I ended up using that one instead and I kept adding flux and wicking around until I managed to get somewhat acceptable results, but it wasn't fast and not exactly professional....a pro tech would not be impressed with the time it took me to reflow those....

The tips and temperature also seem to play a role. I ended up dialing down the temp from 420C to around 390C (on the display at least) on my Gordak because the tip was starting to get gray and looked burnt and charred, so solder wasn't sticking to it and was instead blobbing on my pins instead . Lowering the temperature allowed it to stay shiny a bit longer and I got somewhat more acceptable results, but STILL had to wick around more than I would like....or perhaps that's not a bad thing.
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Old 06-14-2019, 08:02 AM   #84
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Default Re: Does flux expire ?? Flux discussion.

i wouldnt go over 350 with flux of any type.
it is pretty crap though, i only use mine for tinning old wires
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Old 06-14-2019, 01:39 PM   #85
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Default Re: Does flux expire ?? Flux discussion.

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i wouldnt go over 350 with flux of any type.
it is pretty crap though, i only use mine for tinning old wires
The temperature on the display is probably considerably off compared to the actual temperature at the tip, so I prefer to keep it a bit higher, knowing the tip is going to be colder anyway. Besides, I mostly go by feel rather than numbers and I sometimes found that not enough heat can lead to poor/frustrating results just as well as TOO MUCH heat....
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Old 06-15-2019, 08:38 PM   #86
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Default Re: Does flux expire ?? Flux discussion.

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Originally Posted by diif View Post
Sure is. Mine is about 3 years old and has the same Lot# as half of those sold today. It's like a copy of a copy of a copy. A bit pot luck how good it is, some stays thick longer than others.
Yup.

Apparently, Kingbo is just another generic Chinese RMA flux, so the quality will vary. But from what I've seen myself and heard from others so far, it's anywhere from acceptably working to very decent. So it's not junk / terrible, typically.

My jar is about 7 years old now. It used to be light tan when it was new. Now it's piss-yellow (the kind of yellow urine you get after not drinking enough water and eating salty shit all day.) It still works, though. Just seems to smoke a lot more and definitely smells worse. Also doesn't seem to stay active for as long at high temperatures / gunks up faster. But like I said, it still works okay, more or less.

So I wouldn't say flux expires - especially rosin fluxes. But in the case of my Kingbo, it did drop down a bit of its stability at high temperature, it seems. And in the case of rosin fluxes... well, those could dry up due to the alcohol evaporating from them - but that's usually fixable by adding more alcohol.

Last edited by momaka; 06-15-2019 at 08:39 PM..
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Old 06-16-2019, 02:00 AM   #87
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Talking Re: Does flux expire ?? Flux discussion.

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Now it's piss-yellow (the kind of yellow urine you get after not drinking enough water and eating salty shit all day.)
ROFL ! I think I just spat my drink all over the laptop - liquid damage !

Ok, so it wasn't the flux that was bad after all, it was just me who sucked on those QFNs back there

I too noticed the kingbo flux I pictured below smokes a LOT - Mr G. let me use some once when I quickly needed to desolder something at his table and I dipped the wick in it to make it more absorbent and it smoked so much that I couldn't see what I was doing and choked on the smoke. Then again, he keeps his iron turned all the way up, so it was probably REALLY hot...
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Old 06-16-2019, 05:28 AM   #88
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Default Re: Does flux expire ?? Flux discussion.

Could it be hot air settings?
if the "air" is too high, when the fluxes melted it will go everywhere but the "place you want to melt"
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Old 06-16-2019, 05:55 AM   #89
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Default Re: Does flux expire ?? Flux discussion.

True, though I did turn it way down because of this reason. Not to mention, it also tends to blow away the part you're working on as well, plus other smaller ones around it, quickly turning a 5 minute repair job into a 1 hour nightmare....
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Old 06-16-2019, 06:28 PM   #90
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Default Re: Does flux expire ?? Flux discussion.

The air speed is too high if you're blowing away other parts.
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Old 06-21-2019, 08:22 PM   #91
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Default Re: Does flux expire ?? Flux discussion.

Can confirm momaka's experience with kingbo. It has darkened, especially where I dip the tip in. When new, it was a light cream color. Still seems to work just fine. It does smoke a lot, I hold my breath when soldering anyway, helps to keep the hands steady. I used to seal it after using and it stayed the same color, but it has spent the past three years open on my bench.

The only way the residue will come off is with brake cleaner in my experience. Must be careful about that stuff, the cleaner must be completely gone before soldering.
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