How to test the quality of solder paste and solder paste? JJY Solder Paste Manufacturer

How to test the quality of solder paste and solder paste? There are many types of solder paste on the market at present. I believe everyone has come across many of them. Generally speaking, for many large companies, the impact on this aspect is not significant because they definitely have their own fixed merchants. However, it is different for some newly established companies. To choose the suitable solder paste, it is also necessary to consider whether it meets the product requirements of their own. Since the quality of solder paste can simultaneously affect the overall connectivity of electronic devices after electric soldering, not only in terms of structure but also in the on-off characteristics of electrical equipment, if the above-mentioned experimental testing method is applied, such as overcurrent remelting, not only will time be wasted, but also the differences among different circuit boards of the same batch number will be very large. Next, JJYSolder paste manufacturerCould you please tell me how the tests are usually conducted?

The first method to identify genuine and fake solder paste is as follows: Tin is a silvery-white metal. The surface of newly cast tin ingots made of environmentally friendly tin often forms a golden-yellow oxide film. When the tin bar is bent forcefully, due to the effect of the tin double crystal, a rustling sound will be produced. If you bite it hard with your mouth, it feels like you are biting into a rustling sound, which is called the tinkling sound. The louder the tinkling of tin, the better. This is the basic knowledge for understanding environmentally friendly tin. There are many unscrupulous merchants who often use "zinc" and "potassium" to deceive people. This is because potassium and zinc also make a rusting sound. The main difference lies in that when burned for more than two minutes, environmentally friendly tin is not afraid of fire, while potassium and zinc are. After being burned for more than two minutes, they will smoke. The colors are either blue or red. The difference lies here.

Inspection process for the quality of solder paste

1For the inspection of solder wire powder, a low-magnification optical microscope can be used to precisely measure the particle size of the tin powder to examine the division of tin powder particles. If the particle size of the metallic tin powder is relatively smooth and the sphericity is good, and the sphericity of the metallic tin repair liquid is very high, it indicates that the quality of this solder paste solder wire powder is relatively good. It is not easy to affect the quality of surface mount printing carried out on the screen. 

2The metal elements in solder paste are precisely measured by using an atomic absorption spectrometer. Generally, the test items are all harmful chemical elements such as cadmium, a fluorescent agent If the solder paste is a phthalate solder paste, it is also necessary to check in advance whether the halogen components in the solder paste meet the regulations.

3Viscosity test: The viscosity of solder paste can greatly affect its printability on the screen. If a solder paste has high viscosity, its slump properties will be greatly improved, but its printability will not be good, which may affect the demolding effect. The solder paste may stick to the stainless steel screen, resulting in poor printing. 

4Steel wire mesh printability testing, applicationsmtPrinting solder paste on steel mesh is an indispensable process in surface mount soldering methods. Therefore, it is essential for a solder paste to have good printability. ThusIQ CThe unit can take a small amount of solder paste to conduct printability tests to verify whether the printability of the wire mesh of this solder paste is excellent.

5The forgeability of the solder wire hook and the swewability of the solder paste can be further divided into moisture resistance and soldering resistance. The main function of this test is to check whether the solder paste will become rough. If it is not dry, does the strength of the connection after soldering meet the requirements? This process of testing for quality can be carried out using discarded circuit boards and electronic components that have long been disassembled. 

6The inspection process for whether the spot soldering is smooth and has a luster can be carried out by adhering solder paste to the glass window and then soldering it in a reflow oven. After the soldering is completed, it can be observed with the naked eye to see if the spot soldering has a luster. Can you also see a lot of residual solder paste from the glass window after the electric soldering? 

Summary of regulations for solder paste: 

1It has excellent flipping characteristics. 

2It has low viscosity throughout the printing process and high viscosity after printing. 

3It has an effective practical effect of getting rid of the steel mesh and the scraper. 

4It has the characteristic of not drying out at room temperature but drying out very easily at heating temperature. 

Want to know about solder paste, solder pasteLow-temperature solder pasteDear partners of solder wire and solder bar, welcome to consult Shenzhen JJY Industrial Technology Co., LTD. Let's learn and grow together!