100% new brand s 1PCS NC-559-ASM Lot#081-188 volume:100g Used in mobile phone PCB, BGA and PGA SMD rework solder paste, it is used in low ionic activator system, run tin speed, smoke degree is very low, surface residue after curing of the insulation resistance value is very high, therefore, the interference of electric mobile phone and other communications products is very small. Two. Product performance: NC-559-ASM is a disposable type paste flux residue color, very pale, has a high SIR value, BGA, CSP ball array of solder ball for repair and mending suggestions. To play in the welding process: "the oxide removal" and "reduce the paste chemical two major role of material surface tension" by welding. Widely used in watches apparatus, precision parts, medical equipment, arts and crafts, stainless steel tableware, mobile communications, digital products, air-conditioning and refrigerator refrigeration equipment, glasses, knives, auto radiator and all kinds of PCB plate soldering. Edit this paragraph effect of removal of surface oxides because of atmospheric oxygen, a variety of material reality is surrounded by a layer of oxide, its thickness is about 2 * 10-9 to 2 * 10-8m. When in welding, film will prevent the solder wetting on base metal, welding is not normal, and therefore must be in the surface coating base material flux, the reduction of the oxide on the surface of the parent material, so as to achieve the purpose of removing the oxide film. On the other hand, the high temperature of welding is easy to make the welding material surface oxidation. Solder paste is helpful in preventing oxidation process. To reduce the surface tension of the material surface tension material will influence the welding quality, reduce material tension another effect of the solder paste. The surface tension of molten solder will prevent to parent metal surface overland flow, influence the wetting of the normal. When the flux is covered on the surface of molten solder, can reduce the surface tension of liquid solder, the wetting performance improved significantly. Edit this paragraph paste flux types according to welding masterbatch can be divided into stainless steel solder paste, solder paste help et al cu. In accordance with the composition of the material (1) chemical effect of inorganic series inorganic series flux flux flux of strong, performance is very good, but the corrosion effect, belonging to the acidic flux. Because it is soluble in water, so it is also called the water soluble flux, it includes 2 kinds of inorganic acid and inorganic salt. The main ingredients containing flux of inorganic acid is hydrochloric acid, hydrofluoric acid, the main component of flux containing inorganic salt is zinc chloride, ammonium chloride, after using them must be immediately cleaned very strict, because any residue in the process of the halide will lead to serious corrosion. This flux is usually used for welding of non electronic products, the use of this type of inorganic series of flux is strictly prohibited in the electronic device assembly. (2) organic series of flux (OA) between organic series flux soldering flux and interaction between inorganic series resin series of flux, it also belongs to the acid, water-soluble flux. Contains organic acid water soluble flux with lactic acid, citric acid as the foundation, due to the welding residue which can be welded on the retention period of time without serious corrosion, thus can be used in automatic assembly of electronic equipment, but generally not in SMT solder paste, because it is not sticky rosin flux (prevent the SMD components mobile role). (3) resin series of fluxes in the welding of electronic products used in the largest proportion is resin type flux. Because it can only be dissolved in the organic solvent, it is also known as the organic solvent flux, it is the main component of rosin. Rosin is non activity in the solid state, only the liquid is active, its melting point is 127 DEG to 315 DEG C activity can be sustained. The optimum temperature of soldering is 240 to 250 DEG C, so is in the active temperature range of rosin, and its welding residue does not exist the problem of corrosion, these characteristics make the rosin is non corrosive flux is widely used in the electronic equipment in welding. Function of flux function part edit this paragraph solder paste help include: matrix, to film agent and surface active agent. Matrix is the main component of flux, control the flux melting point, melting after covering the solder joint surface, plays the role of isolated air, at the same time, it is also the other functional components of the solvent. To the film agent is removed by physical and chemical processes, breaking or loosening of parent metal oxide film on the surface of molten solder wetting, makes to fresh surface of the parent metal. Surface active agent can further reduce the interfacial tension between the molten solder and parent material, causes the molten solder better in mother? For hulling and Mo Tao Geng? The main role of flux: (1) the removal of base metal and the oxide on the surface of the liquid solder brazing process, create the conditions for the spreading of liquid solder. (2) with a thin liquid layer in the base metal and filler metal surface protective effect of air isolation. (3) play a role to improve the interfacial activity, wetting and spreading properties of liquid brazing filler metal on the surface of the parent metal. Edit this paragraph to help the solder paste selection and the melting point of the solder to match in order to match the solder used, selected the melting point of solder paste should be lower than the melting point of the solder 10-30 C. The melting point of solder paste as below the melting point and is easy to melt early and that the flux of active ingredients of premature failure. According to the welding material selection for the oxide film surface characteristics of alkaline oxide film, should choose acid paste flux; and for acidic oxide should choose flux alkaline. According to the brazing process used to select according to the different shape of solder paste specific processes, such as soldering to the choice of liquid solder paste, high frequency or intermediate frequency induction brazing to choose Paste flux, flame brazing to choose powdered flux or paste flux etc.. According to the characteristics of welding material and its main base alloy with different matrix materials because of the oxide film on the surface of different, its choice of solder paste type also exists bigger difference, especially some metal difficult to weld, such as containing magnesium alloy, stainless steel, hard alloy etc.. In order to ensure the welding performance of aluminium alloy containing magnesium, usually choose flux activity stronger. Edit this paragraph note 1, do not add food helps the soldering paste. 2, the skin do not contact with the solder paste. Ready in time, can be successively with dry towel, cotton cloth to wipe with alcohol, finally soap cleaning carefully. 3, because of containing flammable solder paste in the solvent, when using, should keep away from fire. 4, the use of lead-free solder paste of the plant must be installed within the ventilation device, often into the fresh air. In 5, when the solder paste reflow soldering, because within the solvent decomposition will produce gas, you must have a local exhaust device. 6, different types of solder paste is not mixed use. Cleaning liquid, cleaning circuit boards, 7 templates use do not mix in the solder paste. 8, waste solder paste help please strictly in accordance with the relevant regulations for processing. 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