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Solder

Regarding the use of flux, solder paste, flux-cored solder and all solder-related products
Controlling the Specific Gravity of the Flux
The quality of soldering can vary as the solvent of an alcohol-based flux is allowed to evaporate. Please be sure to use the special diluents for each flux and to adjust their specific gravity accordingly. When using a spray fluxer there should be no solvent loss so that adjustment of the specific gravity is not required
Preheating
Preheating is an essential part of the soldering process. Preheating ensures that the solvent, which is contained in the paste, is made to evaporate, which in turn activates the flux. Preheating also affixes the resin content to printed circuit boards, components and solder pads in addition to preventing the dispersal of the flux during the soldering process.
Moreover, when heat is applied after preheating, the incidences of heat shock are much fewer in number. In other words, proper application of the preheating process will make the difference as to how the solder disperses when applied and will also lower the incidence of bridging and balling, positively influencing the overall reliability of the solder in question.
Replacing the flux
Flux use and the results therein are affected by oxidization, moisture absorption, dust and oil traces on the printed circuit boards, all of which influence the overall result. In particular, resin type flux, when impregnated by moisture, can become cloudy and pipe blockages can form due to foaming. Increases in specific gravity can lead to increases in concentration in solution. Therefore it is advisable that the flux is replaced at regular intervals. Please be sure to thoroughly flush and rinse the solder tank and all pipes used with the special diluents.
Washing
Please use the specific cleanser for the particular flux in question when removing any residue after soldering. Moreover, please pay special attention to ventilation when using an organic solvent. Again, be sure to adhere to the rules and regulations regarding use and disposal.
When washing with water, the resulting effluent will contain flux residue and/or lead. Be sure to dispose of the effluent in line with local and regional laws and statutes for doing so, with particular reference to the pH, BOD and/or COD.
Other Points
Alcohol-based flux and our chemical products are highly inflammable so please keep these products away from heat sources and naked flames.
Please ensure that operators and workers are provided with adequate ventilation and are not obliged to inhale the fumes released during the soldering process. It is recommended that safety gloves and safety goggles are used at all times.
Please ensure that the flux is not mixed with any foreign body and that it is only housed in specific, specialized containers. Using metallic containers will lead to corrosion of said container.
When disposing of solder sludge, please ensure that the local and regional laws and statutes are upheld and that disposal takes place in a responsible fashion.
NS-22 NS-23 and NS-72 all contain zinc chloride.
Before placing an order for these products please check the laws and regulations relating the transport of hazardous materials in Japan as well as the country of destination.   Information relevant to their transportation is provided on the MSDS.
Prior to use, please be sure to read and understand the material safety data sheet (MSDS) for each and every product.
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