Liquid solder1/6/2024 Common uses of flux gel include BGA re-balling and the rework/repair of solder joints. This means that, when used directly as a soldering aid, a small amount of solder paste flux can be used in place of a relatively large amount of liquid flux. Solder paste flux gel can be brushed on where needed and, unlike liquid flux, will not flow away from the application area. A slow rise in temperature is necessary to prevent solder balling, but must be great enough to activate the flux, then melt the solder itself, and recool quickly enough to retain the desired shape. Once printed, the circuit board forming process is followed by pre-heating and reflow (melting).įor the flux, the temperature and rate of change in temperature are key in the reflow process. The solder paste flux component must have enough tackiness to secure the components while the fixture is processed through the manufacturing line. Paste is spread over a stencil in the pattern required on the final end product, a printed circuit board. Once mixed, solder paste is most commonly used in a stencil-printing process. Its tacky nature holds components together until the heat of the soldering process melts the solder and the parts are fused together. Solder paste flux can also act as a temporary adhesive. While the main use of solder paste flux is in the creation of solder paste, it is also sold directly as a gel or tacky flux. There are three types of solder paste flux: The J-STD-004 standard for electromigration and surface insulation resistance is >100 MΩ after one week at elevated temperature and humidity with a DC bias applied. The principal standard is J-STD-004, which categorize fluxes by composition, activity (strength), the presence or lack of halide activators, and reliability from electromigration standpoint and surface insulation resistance (SIR). Standards and DefinitionsĪ number of standards exist to define the various flux types. However, the non-metallic ingredients of the flux, due to their lower density, result in their comprising of nearly half the paste volume. Solder paste flux typically contains 60-80% by weight active ingredients, compared with liquid flux’s 2-25%.īy weight, a mixed solder paste commonly consists of 90% metal. Solder paste flux is different than liquid flux in both physical form and activity level. It also prevents the beading of the applied solder, facilitating easy flows and application. This prevents the formation of metal oxides on both the base and filler materials to which it is applied. Rheology Modifiers – any of a variety of compounds that allow a liquid to display Non-Newtonian properties that is, to change viscosity as pressure is variedįlux is nearly inert at room temperature but becomes strongly reducing when its temperature is increased.Activators – chemicals disrupting/dissolving metal oxides, typically acids of various corrosivity.Surfactants – a detergent used to lower the contact angle of the flux with the surface its applied to, allowing greater coverage.Rosins/Resins – high-temperature tolerant, non-volatile chemicals, most commonly forms of glycol.Solvents – liquid used an inert medium to combine the active ingredients, such as water. Above all, we provide timely delivery services at the most befitted price which has thus made us widely appreciated in the industry.Solder paste flux has a very complex chemical composition. Furthermore our skilled team of personnel is made responsible to carry stringent and rigorous inspections over the quality of product, so that no kind of conciliation is sought with the demands of our customers. All our products are fabricated from the most advanced technology and raw material under strict adherence to the laid down standard rules and principles. Our constant effort is to blend quality and cost effectiveness of products, so as to stand upon the multicolored demands of our reputed patrons. Incorporated in the year 2012, GEO TELENET is an eminent business name, actively affianced in the supplying, wholesaling and trading of premium quality mobile accessories like Mobile Cover, Night Glow Mobile Cover, Printed Mobile Covers, 2D And 3D Mobile Covers, Customized Mobile Covers, Unique Mobile Covers, Tempered Glass, Transparent Flip Cover and Leather Mobile Cover.
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