Everwide newsletter No.458

skill484
Aug 4
3 min read

Experiment § Various types of underfill adhesives

Underfill adhesives are epoxy resins used in semiconductor packaging, primarily designed to fill the gaps between the die and the substrate. They are widely applied in mobile devices, high-frequency products, and electronic components that demand high reliability (Figure 1). After the chip has been soldered, such as in flip-chip technology with micro bumps, the underfill provides mechanical reinforcement, alleviates stress concentration caused by differences in the coefficient of thermal expansion (CTE), and enhances the durability and reliability of the solder joints. This prevents solder joint cracks or delamination due to thermal cycling or mechanical shock. Underfill materials require low viscosity to effectively penetrate narrow gaps, while also possessing excellent curing characteristics to ensure rapid capillary flow into the solder joint area upon heating. In simulation tests using glass substrates, we observed that the underfill quickly filled the solder bump regions (Figures 2–4). At Everwide Chemical, we have developed various underfill solutions tailored to different application needs, such as the JE540 series. Please feel free to contact us for more detailed information about our products. — Author: Mr. Tan-Yu Chen

Activity § 2025 Thailand International Electronics Manufacturing Exhibition

We participated in the Thailand International Electronics Manufacturing & Microelectronics Exhibition (NEPCON Thailand 2025), held from June 18 to June 21. This year, the event gathered 1,072 exhibitors from 30 countries, making it a truly global platform. At our booth, we showcased products made from four key material systems: epoxy resins, UV-curable resins, MS polymers, and silicone resins. An interactive demo zone was set up, allowing visitors to experience hands-on applications and directly feel the adhesive characteristics of different materials (Figures 1–4). During the exhibition period, we also arranged visits to local customers to gain deeper insights into real-world applications and provide on-site technical support. These customer visits greatly enriched the value of our trip and helped strengthen relationships in the region. We would like to extend our sincere gratitude to Panisa and our local distributor KNET for their tremendous support. Their assistance in delivering product introductions in Thai language made the communication smoother and enabled us to better understand customer needs (Figure 5).

Knowledge § Knowledge About Impact Strength (1)

Impact strength is a measure of a material’s ability to resist sudden impact forces. It quantifies the amount of energy absorbed by a test specimen at the point of fracture and is commonly expressed as the energy absorbed per unit cross-sectional area. The most widely recognized method for evaluating impact strength is the Izod Impact Test, which can be further categorized into Notched and Unnotched specimens, with the notched type being the most commonly used. In this method, a pendulum hammer strikes the notched side of the specimen at a velocity of approximately 3.46 m/sec. The energy required to fracture the specimen is measured and then divided by the specimen's thickness to obtain the Izod Impact Strength.

Living § My Most Accomplished Year — The Journey Beyond Malaysia

2025 has been the most fulfilling and transformative year of my life. It was the year I stepped out of my comfort zone and came to Taiwan alone—not for studying, nor just for sightseeing—but to learn and work here. Although I am a Malaysian Chinese born and raised in Malaysia, where Chinese culture is deeply ingrained in my upbringing, it wasn’t until I started living in Taiwan that I truly realized the many differences between the two places. We all speak Chinese, but the accents, tones, and choice of words are surprisingly different, revealing delightful little cultural surprises along the way. For example, Taiwanese people tend to speak in a more formal tone, whereas we Malaysians often mix in a variety of casual expressions when speaking Chinese. It’s common for us to end sentences with playful particles like “meh” or “leh.” There are also many items that we only refer to by their English names in Malaysia, such as “correction tape,” but in Taiwan, nearly everything has an official Chinese term. Even night markets are quite different. I absolutely love Taiwanese night market snacks—especially stinky tofu! The flavor here is far superior to what I’ve had in Malaysia. Besides the food, I was fascinated by the night market games, such as playing pinball to win sausages or participating in ring toss booths, which are rarely seen in Malaysia. I also found Taiwan’s lottery shops interesting; they release scratch cards with different festive themes throughout the year, which I had never encountered before. Although I was overwhelmed at first trying to adjust to this new environment, these experiences have been incredibly fun. I’m gradually getting used to the local language nuances and lifestyle, and I look forward to growing and becoming a better version of myself here in Taiwan. — Author: Ms. Tong-Er Liao