Sn42/Bi58 30g Lead Free Solder Paste 138℃ No Clean Low Temp Solders Pastes for Electronics Sn42% Bi58% Flux for SMD/BGA/SMT/IC/LED/PCB Repair (Pack of 1Pcs)

Love this stuff! I use it for SMD hand soldering, for tinning wires, in fact for just about every form of soldering where a little extra flux is needed, and that's most cases since the rosin core solder I use (SN96.5AG03CU.5 aka "lead-free") typically supplies an inadequate amount for the job. I even use it to clear pad-shorting solder blobs. This flux works great every time, and makes lead-free soldering a breeze.BTW: When I was first learning how to solder with lead-free (after decades of using lead-tin solder), using a temperature controlled soldering iron and bumping the temperature up to around 290°C for small SMD, and higher for through-hole and large copper surface area cases (like large PCB copper-pours) made all the difference. I use a higher temperature, which allows me to solder fast, thus actually reducing the thermal load on the part(s) involved. I also use a "chisel point" for most of my soldering.

It is my first time using this product and works much better than with roll welding, facilitates the job.

Appears to melt at the proper temperature and had no issues with achiving proper joints even with my budget hot air equiptment.

This low temperature solder paste helps prevent damage to heat-intolerant components. I practiced using it on a surface mount tantalum capacitor and a piece of dotboard. I used 350 degrees F (177 degrees C). It worked well, and the excess cleaned off with isopropyl alcohol.The only trouble I encountered was with the syringe. Upon inserting the plunger, there was a significant volume of trapped air between the black rubber tip of the plunger and the top of the white solder paste cap. The air-tight nature of the black rubber tip made it impossible for the trapped air to escape. This made controlling the dispensing of the paste difficult. Other solder pastes I have purchased have had the black rubber tip of the plunger already placed in the syringe, avoiding this problem. I burned a hole into the side of the syringe to let the air out, but found that what worked best was using the plunger with the rubber tip removed.To conclude: Using this solder paste without the black rubber tip of the plunger should provide better control over the dispensing of this otherwise good low temperature solder paste.

Haven't used it yet, got it for back up if needed for emergency repair for some surface mount electronics. I store it in fridge because it doesn't store forever (supposedly).

Great

Very quick shipping, and quality product.

I saw this ALLECIN Lead Free Solder Paste while browsing in Amazon recently, and being an electronics hobbyist for many years, I decided to order a tube to evaluate it for my purposes. The main thing that I wanted to try it for was to solder headers on microcontroller boards it with a hot air soldering/desoldering tool rather than doing it the conventional way: with a soldering iron and "regular" electronics solder. I figured that with the ultra-low melting point of the paste it would be a great way to ensure that I didn't overheat and damage the components on the boards. Unfortunately, this didn't work out for me quite the way I wanted, since although I could see the solder paste melt and flow when heated with the tool, it didn't properly make the connection from the header pins to the solder pads around the holes where the pins are inserted.That's OK, though, as I learned that the main purpose for this solder paste was for soldering SMD components to the surfaces of PC boards. Since most SMD components are tiny, it's difficult to solder them with a conventional soldering iron (at least, it is for me), and since I occasionally need to make repairs to such boards this solder should really help me make quick work of it the next time I have the need to do so.I love the way the syringe and various tips (one with a 1mm and one with a 1.3mm stainless steel "needles", plus a couple of plastic ones that can be cut to provide other sizes of openings) that came with the syringe allows for precise application of the paste where it's needed, and to help ensure that the proper amount is applied. So even though this product didn't work for my intended purpose, I was able to observe it in action and could see that it would be great for the SMD work. Thus I am awarding the full 5-star rating.