Electronics > Beginners

Solder Paste Recommendations.

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Bud:
A while ago someone recommended Spray Nine, which i tried with Kester leaded stuff and it worked as per the recommendation said. it said use with an electric toothbrush but I used a regular one. Did not try fully soaking the board though. Seems also to be less expensive than crude cutter. Available in Canadian Tire

http://www.canadiantire.ca/en/pdp/spray-nine-multi-purpose-cleaner-0534223p.0534223.html

jmelson:

--- Quote from: tooki on October 09, 2018, 01:26:28 am ---
--- Quote from: jmelson on September 27, 2018, 07:02:52 pm ---
--- Quote from: joeyjoejoe on September 20, 2018, 01:08:50 pm ---Is there a no-clean flux that cleans easily with Isopropyl?

--- End quote ---
If you INTEND to clean the board, use WS (Water Soluble) paste.  It works better than NC, in my opinion, and washes off easily with either water or solvent.

Jon

--- End quote ---
Except that, as others have explained in detail in other threads, without a high quality ultrasonic cleaner and well defined cleaning regimen, you cannot be certain that you removed all traces of flux, and residual water soluble flux is extremely damaging in the long run. For that reason, using water soluble flux is highly unrecommended for home use of any kind. (And even in professional use, there are some applications where it is categorically prohibited, like stranded wire.)

--- End quote ---
Yes, OK, quite valid points!  I currently use WS only on some through-hole connectors that I then wash with a water/toothbrush scrub.  So, there really isn't any place for the flux to get into that isn't removed.  This board is then tested on a bed-of-nails fixture, and I was having problems with no-clean flux preventing the through-hole connections from working.  Soldering those with WS and then a very easy clean-up with water solved the issue.  But, I can see if WS flux got under SMT components that it could cause real problems long-term.

Jon

cdev:
Another much cheaper option short term for desoldering is 'chip quik' and similar alloy solder. Its a low melting point, special solder for desoldering use. Dave did a video on it, check it out. Its very fast and convenient to use.

I agree with what mrpackethead says.


--- Quote from: mrpackethead on September 19, 2018, 06:10:45 am ---Are you hoping to place parts on paste and then reflow with hot air to solder them?

thats fraught with lots and lots of challenges.   Hot Air is not a good tool for putting parts on boards.  Its a good tool for getting them off.

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