Everwide Newsletter
Everwide Newsletter No.305
Date:2019-08-12

Experiment report §Dielectric strength tester

Dielectric strength test is often abbreviated as Dielectric strength. According to ASTM D149, its full name is "test of dielectric breakdown voltage and dielectric strength of solid electrical insulating materials at commercial power frequencies." The experimental equipment is shown in Figure 1,2. Place the test piece between the two electrodes (Figure 3), and select a specific method to increase the voltage, for example: fast boost, slow boost, step-by-step boost... etc. As the voltage rises, the material will suddenly conduct local conduction at a certain voltage, sometimes accompanied by flashing (Figure 4, 5), this time is called material breakdown. A small hole is often seen at the location of the high voltage breakdown, which is the evidence that the material has been destroyed and the charge has passed (Figure 6). The dielectric strength is the maximum value of the electric field strength divided by the material thickness, and the unit is kV/mm.

The dielectric strength experiment can be divided into two types: direct current and alternating current. The measured dielectric strength of the former is relatively high, taking epoxy resin as an example, it can be as high as 60-80 kV/mm. But as far as application is concerned, the AC data is more in line with the actual situation. The molecules of the material move with the change of the electric field, and the measured dielectric strength is relatively low. The epoxy resin is about 20 kV/mm. The equipment purchased by Everwide has a capacity of 100,000 volts, and both AC and DC experiments can be performed, which will enable a better grasp of material properties.
─ Author: Mr. Ren Solvay
About Everwide § Internal auditor training

In June of this year, we opened the IATF16949 internal auditor training course (Figure 1). Course syllabus: 1. Process method and risk thinking audit skills 2. ISO9001 and IATF16949 provisions 3. Planning, execution, preparation of audit reports and methods for missing cases 4. Five core tools 5. Customer special requirements. In addition to the explanation of the provisions in the course, PFMEA & DFMEA are also produced in the form of group discussions. During the discussion, everyone puts forward their own opinions, and can also have the opportunity to review the course content again and understand the problems and blind spots encountered in practical applications. In addition to meeting certain standards and passing examinations, the attendance rate of audit training students must also participate in internal audits (Figures 2, 3) and output audit records. Learning from each other and practicing at work allows us to continuously improve and enhance our abilities.

Knowledge Exchange § Where did the name MS resin come from?

The main chain of the traditional RTV1 silicone resin (RTV1 Silicone) is composed of polydimethylsilane, and the hydrolyzable silane at the end of the molecular chain is used for cross-linking reaction. The main chain of MS resin (Modified Silicone, modified silicone resin) is the most common polyether type (Polyether) and polyacrylic type (Polyacylate). The molecular chain end of MS resin is the same as the silicone resin of RTV1, using hydrolyzable Silane for cross-linking reaction. Because the main chain is different and the reaction mechanism is the same, it is named MS resin. It is worth mentioning that the main chain is Polyurethane, and the end is connected to hydrolyzable silane. The reaction is the same as that of MS resin. Sometimes called STPU (Silane terminated polyurethane).

Bi-weekly strike § Everwide in my eyes

Speaking of "chemistry", it can be said to be quite unfamiliar to me who is studying management. The first time I went to work in a "company" type of place, it inevitably made me a little nervous. There is also a lot of learning and understanding about company management in university textbooks, but it is only learned from textbooks. After entering Everwide, I was curious to know what kind of Everwide belongs to? So while learning how to complete the work, I also observe the people, things, and things around me. Everything here deeply moved me: I deeply felt the "learning organization management model". how to say? Because in each department, not only new colleagues are learning, but many colleagues around them are also learning from each other. In addition, I also feel the importance of team division and cooperation. There is no differentiation between managers and managed. Colleagues discuss and complete work projects together. The atmosphere is pleasant and humane. Colleagues follow their own pace to find the most suitable way to complete the work. These experiences gave me a different understanding of the "company". When colleagues do not understand something or make small mistakes, they will not blame each other but will teach and remind again, pointing out what needs more attention, so that the process of mutual sympathy and empathy is naturally better than scolding, Employees are better able to exert their abilities and limits. In my eyes, Everwide is a team where employees and the company trust each other, without sharp eyes staring at their every move, I think this can improve the loyalty of employees to the company. I am very grateful to Everwide for giving this internship opportunity. In addition to learning work skills, he also learned a lot in interpersonal communication and relationship promotion. Although Everwide has a low connection with what I have learned, I take this opportunity to learn cross-field knowledge, accumulate different experiences, and have a broader thinking and vision. I believe it will be helpful to the future.
─ Author: Miss Li Tianhui

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