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One of the most significant challenges in the electronics industry is the formation of voids in solder joints. Voiding typically occurs when flux or solvent in the paste becomes trapped in the joint, or paste oxidises, and empty spaces are created within the joint. Too many voids in a solder joint will impact the joint’s reliability, so it’s important this issue is avoided.

Examples of high levels of voiding within a solder jointExamples of high levels of voiding within a solder joint

Examples of high levels of voiding within a solder joint

Because there in an increasing use of power transistor components in surface mount electronics, the reflow discharge of generated gas, and the subsequent voiding, is becoming a more critical issue with these larger-sized components.

Koki, our partner for soldering solutions, has developed S3X58-G803, which is a lead-free, ultra-low voiding solder paste. But what does that mean, and what sets it apart from other solder pastes?

How does S3X58-G803 reduce solder joint voiding?

The G803 solder paste is engineered so the oxide reduction reaction occurs before the solder melts or during pre-heating stage.

G803 void reduction technique

Koki G803 solder paste void reduction technique

Then a very fast solder wetting action discharges flux gas as the solder melts. This means that almost no non-wet locations are left, no flux remains in the joint and there is no continuous outgassing. No flux trapped in the joint means the opportunity for voiding to take place is significantly reduced.

This formula ensures stable and consistently low voiding, regardless of the metallisation condition of the component or PC board; the type or shape of the components; or the reflow profiles.

Another benefit of G803 is consistent, continual printability with fine pitch component board pad patterns. And in terms of electronic compatibility, a heat-resistant flux activator system enables good solder coalescence with micro-components, even under harsh reflow profiles.

How does S3X58-G803 compare to other solder pastes?

As the below image illustrates, the G803 solder paste significantly reduces voiding compared to similar products.

G803 voiding results within a solder joint

G803 voiding results within a solder joint

G803 also has powerful wetting performance, which combats another common challenge in the electronics industry of poor wetting paste, and in turn increases soldering speed. A balance of both important capabilities creates an overall high quality of performance, and reliable effectivity in use.

For more information about our range of Koki solder paste, visit our webpage here, read more about Koki and its products here.

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Fraser Technologies are proud to have supported the cleaning industry for last 50 years, working closely with their customers to understand their challenges and their expertise to offer best-in-class cleaning solutions. From component cleaning, electronics soldering, and heat transfer & carrier fluids they have built their expertise over the last 50 years and still continue to offer technological advances, adapt to legislative changes and embrace environmental challenges.

Fraser Technologies are well known for being considered one of the leaders within the Precision Cleaning industry and offer a wide range of new generation chemistries coupled with both solvent and aqueous cleaning systems. They can help extend the life of existing processes and equipment, recommend and install new equipment, or look at how best to improve efficiency and reduce environmental impact. This is all achieved through their superior trial and demonstration facilities and first class after sales service.

Companies from the aerospace & defence, electronics, medical, optics and automotive industries have chosen to work with them because of their expert knowledge in their industries, their independent range of products, and their can-do tried and tested approach to ensuring they provide access to the latest technologies – improving performance, productivity, environmental performance and operator safety.

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