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Author Topic: How do you prevent your solder paste drying out?  (Read 320 times)
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Cain
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« on: May 19, 2017, 09:01:23 21:01 »

Quite a few times it dry's out for me in the syringe (in the needle). To counter that I just started pushing a thin needle into the syringe (fits perfectly) and then place a blob of "clay" (don't know the English term for it but if I say it's used to put up posters on the wall you know what I mean ) to make it air tight.

Don't know it it works yet and curious how you guys are doing it?

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Checksum8
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« Reply #1 on: May 19, 2017, 10:01:49 22:01 »

I never had much luck with the syringes after couple of uses. So what I do now is spoon some out of the storage syringe and onto a plastic surface. Then I take some "Chipquick" SMD291 flux and mix it in a little at a time until I get the right consistency. Then I put this into a clean syringe. Or stencil it on. The flux brings the solder back to life. I wouldn't use this method on a production run or some critical application. But for protos and hobby use it seems to be okay.
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Gallymimu
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« Reply #2 on: May 20, 2017, 01:09:17 01:09 »

I use the tapered luer lock style http://www.newark.com/productimages/standard/en_US/3757518.jpg

I keep it in the fridge, in a ziplock, and generally don't have any problems.  We have some syringes that have been in the fridge for a year with use ever few months and it is generally OK.
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vern
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« Reply #3 on: May 21, 2017, 10:32:01 22:32 »

Put it in a Ziplock in a fridge. Smoothe out as much air from the ziplock as possible before closing it.
If you have some desiccant bag from buying components put them in the ziplock too. With moisture the solder paste will age faster.
Before using let it warm up to room temperature in the ziplock, because otherwise humidity from the air will condense on the cold paste and spoil your solder joints.
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