Concorde Electronics

Syringable solder paste requires a needle and plunger for application. The 100 g paste comes in a standard 30cc. syringe. 35 g samples come in a standard 10 cc syringe. Most distributors carry plungers and needles. Scientific supply companies such as Fisher Scientific (www.fishersci.com) and Cole Parmer (www.coleparmer.com) also carry plungers and needles. For dispensing SMT solder paste a 20 gauge needle is the smallest that is usable.

It is required to remove the residues of OA fluxes? You will get corrosion if you do not fully remove all the flux residues. The flux residues from organic fluxes are hygroscopic, they contain organic acids and they may contain halides. Over time the residues will absorb moisture and the halides will become mobile and corrosive. This will lead to ‘catastrophic failure’ of the assembly in question. We recommend cleaning with an aqueous cleaning system, it can be either batch type or in-line. The water temperature should be between 120-140°F. The important thing is to have lots of rinsing and flushing to completely remove all the flux residues. Source: Kester Solder Co.