Everwide newsletter No.453

skill484
May 26
3 min read

Experiment § UV-curable epoxy adhesive resistant to pressure cooker test (PCT)

Many electronic components need to pass the Pressure Cooker Test (PCT), also known as the Saturated Steam Test, which is a highly stringent environmental simulation test. The test conditions involve placing the sample under saturated steam pressure at high temperature (100% relative humidity) to simulate whether the cured adhesive on the packaged component can withstand prolonged exposure to harsh conditions of high temperature, high humidity, and high pressure without adhesive failure or moisture barrier breakdown. Moisture ingress can cause short circuits, corrosion, and other failures in the packaged components. In this experiment, we compared the “pre-improvement” adhesive formulation with the “post-improvement” formulation. Both adhesives were dispensed onto glass substrates with identical bonding area and thickness, then sandwiched between two glass slides. After curing, the samples were subjected to the PCT at 121°C and 100% relative humidity. Every 24 hours, the bonding condition between the cured adhesive and the glass was inspected. Results showed that the “pre-improvement” adhesive completely detached from the glass after 24 hours of saturated steam exposure (Figure 1). In contrast, the “post-improvement” formulation only showed moisture ingress starting at the edges after 96 hours (indicated by darker coloration at the edges), while the adhesive bond between the adhesive and glass remained intact (Figure 2). Currently, we have developed a UV-curable epoxy adhesive capable of withstanding over 72 hours under the saturated steam test conditions at 121°C. This adhesive utilizes a cationic polymerization curing mechanism with epoxy resin as the main component. It features excellent processability, allowing dispensing at room temperature with automated dispensing equipment. The adhesive can be customized in black or other colors, and its physical properties can be tailored to specific requirements. We welcome you to contact us if you are interested. — By Miss Lei Ching-An

Activity § Let's Explore Science Together: The Secrets of Polarized Glasses!

Everwide participated in the 2025 International Women and Girls in Science Day event, themed “Dougao Magic Show: Seeing Through You” (Figure 1), supporting the 211 International Day of Women in Science. We actively promote STEM education—covering Science, Technology, Engineering and Mathematics—through engaging interactive activities designed to help participants understand the principles behind polarized sunglasses and explore the wonders of light. The event attracted attendees of various ages and backgrounds. With detailed explanations provided by students from Douliu High School, visitors learned about science in a fun way, experiencing the allure of technology firsthand. Together, we shared a science carnival filled with knowledge (Figures 2 and 3). We warmly invite you to join us in exploring the fascinating world of science!

Knowledge § What is dynamic fatigue? (1)

Dynamic fatigue refers to the failure of a material under repeated, cyclic loading. It is typically characterized by mean stress, amplitude, stress cycle (or frequency), and stress waveform. The stress levels that a material can endure under dynamic fatigue are significantly lower than the maximum stress it can withstand under a single static load, and its service life is considerably shorter than under static conditions. In general, the higher the mean stress, the greater the stress amplitude, and the shorter the stress cycle, the shorter the material's fatigue life. The causes of dynamic fatigue failure can be categorized into: Thermal fatigue failure and Mechanical fatigue failure.

Living § Japanese evolved from a hobby into a lifestyle

It is a great honor to share my journey of self-learning Japanese and obtaining certification in this edition of the Everwide Biweekly. I’ve always been passionate about Japanese culture—whether it’s anime, games, TV shows, or books, I’ve wanted to understand them instantly. I also love singing and was naturally drawn to Japanese music. Whenever I came across a song I liked, I would write down the lyrics, sing along, and use that to study Japanese. Over time, even without formal lessons, my love for the culture helped me gradually build up my reading and listening skills. Eventually, I could understand Japanese programs without subtitles. This hobby has also allowed me to meet many like-minded friends. Through our shared interest and conversations in Japanese, my speaking skills improved significantly. Encouraged by friends, I signed up for the Japanese Language Proficiency Test (JLPT) in July 2024, challenging N3 and N2 levels on the same day. To my surprise, I passed both exams. That moment was deeply rewarding—it was clear that all the years of effort had paid off. Looking back, I truly believe that a deep passion for something can be an incredibly powerful force. It drives us to stay committed and keep moving forward. Ten years have passed in the blink of an eye, and Japan has given me many wonderful memories and a strong sense of achievement. It has become an inseparable part of my life. I've never once regretted investing the time and energy into learning Japanese. Instead, I feel nothing but gratitude and pride for the journey I've taken. — By Miss Chen Chien-Yu