MG Chemicals4860P-35G 4860P 63/37 No Clean, Leaded Solder Paste, 35 g (1.2 oz) Pneumatic Dispenser (Complete with Plunger & Dispensing Tip)

A comparación de otras pastas, esta me gusta porque no deja residuos.

Works like a charm! Just lay a little bit, put you component and when you use a heat gun, the paste just magically melts and makes a perfect joint between the board and component legs without shorting any connections!

At my day job - which I've been advised not to quit on numerous occasions - we buy and use Kester EP256 solder paste by the pound, and it is a most excellent paste for what I would call "semi-pro" operations, but for reflow soldering boards at home with ye olde toaster oven I found that EP256 wasn't nearly as tolerant as the promotional literature claims of such all-too-common abuses like taking more than a couple hours to populate the boards or not exactly following the recommended heating profile. Also, I really hated buying a pound jar of the stuff for $80 only to send most of it off to hazmat recycling a year later. And believe me, solder paste definitely goes bad over time (more precisely - it is the flux that goes bad, but the end result is the same: crappy/defective solder joints)Fortunately, MG Chemicals delivers the goods once again with this No Clean solder paste (the "No Clean" refers to the type of flux, which remains non-corrosive and non-conductive after soldering). It is easy to dispense and spreads well across a stainless steel stencil. It is also fairly easy to dispense directly to each pad through a 22ga. blunt needle.Even better is that it seems to tolerate real-world toaster oven reflowing. I have a modified toaster oven that uses a proper industrial PID temperature controller with a thermocouple that is pressed against the board to control actual board temperature, but in the pursuit of laziness I tried "open loop" reflowing of a non-critical test board by setting the toaster oven to "toast" and letting it rip up until the temperature hit 170C, then I dialed back the thermostat knob and let it dwell there for 30 seconds, then cranked the thermostat back up until the temp hit 225C then dialed it back once again and cracked the door just a tad after about 5 seconds at 225-ish. Surprisingly, there wasn't a single cold/failed joint and they all passed vibration testing. Attached is a picture of a portion of a board that was soldered using this commando process and the MG Chemicals paste.

A little pricey, but no more than equivalent products, and besides it works great so I can't complain. I guess I'm just cheap, or used to the prices of solder wire by the roll.Works well for SMD devices.

I've just used this paste to reflow solder a surface-mount pcb, and it worked great. I don't have a solder paste stencil for this board, so I had to apply the paste manually, As another reviewer mentioned, the dispensing tip that comes with this syringe is huge compared to common smt pads. Instead of using the included tip, I tried substituting a 22ga needle. The paste will go through the smaller needle, but the force required on the plunger is far too much for good control, so I tried putting some of this paste into a smaller 1mL syringe with the 22 ga tip. The smaller syringe is MUCH easier to dispense (the 22ga tip gave a bead small enough to lie inside an SOIC pad - for finer pitch parts, you might want an even smaller needle). Note that the tip included with this paste will fit inside the front of a 1mL syringe to easily fill the smaller syringe with some paste.Reflowing my PCB using this solder on a cheap electric skillet worked perfectly. I a few places, I has applied too much solder to the pads, and got a few solder balls, but they were easy enough to scrape out of the melted flux with a needle. A quick look through the inspection microscope showed nice, shiny joints everywhere with no bridges.