What is the difference between flux paste and flux

Both flux paste and flux play an important role in the soldering process, but there are some differences between them in terms of their appearance, how they are used, and so on.The following is a detailed comparison of the two:

I. Appearance

Flux: usually presented as a transparent liquid.

Flux paste: is a paste chemical substance, with solid form.

2. The main components and functions

Flux: generally rosin as the main component, may also contain resins, halide-containing active agents, additives and organic solvents.Its main function is to remove oxides on the surface of the solder and the base material to be soldered, to prevent re-oxidation of the surface of the solder, reduce the surface tension of the solder to improve soldering performance.

Flux paste: also has the role of removing oxides and reducing the surface tension of the material to be soldered.Flux paste also contains a variety of chemical compositions, but may be optimised for specific soldering needs, has an adhesive force, can be fixed chip devices, can be applied by printing dispensing, only the soldering area to apply flux paste.

3. the utilization

Flux: It is mainly used with the solder bar to provide the necessary assistance in the soldering process.

Flux paste: more commonly used in maintenance welding and BGA, pre-positioned solder package, because of its paste form to facilitate the precise application in the local area.

4. Application Scenarios

Flux: It is widely used in the soldering process of various electronic assemblies to ensure the quality of soldering.

Flux paste: Due to its specific paste form and function, flux paste is more suitable for clock and watch instruments, precision parts, medical devices and microelectronic semiconductor precision devices and other occasions that require high-precision welding.In addition, flux paste is also widely used in stainless steel crafts, mobile communications, digital products, air conditioning and refrigerator refrigeration equipment, glasses, cutting tools, automotive radiators and various types of PCB boards and BGA solder ball brazing and other fields.

In general, there are differences between flux paste and flux in terms of appearance, main components and functions, usage and application scenarios.When choosing which flux material to use, the decision should be based on specific soldering needs and process requirements.