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58 DESIGN007 MAGAZINE I AUGUST 2022 With so many different encapsulation resin options on the market, selecting a resin that is best suited for your application can present a real challenge. Today, there is a wide range of different resin systems available that offer a comprehensive range of different properties. It is oen assumed that properties can vary mod- erately, however, resins can offer significantly different benefits. is month, I will explore the different factors you should consider when comparing resins for your application. Every project will differ in terms of the unit, the dis- pensing method and equipment that will be used, the cure time, and temperature limita- tions during the production process. First, I establish the the resin's ultimate oper- ating conditions, temperature range, and likely chemical exposures. I will look at resins that have the biggest impact on performance and reliability. Let's look at where to start and what you need to factor in using our signature five- point format. Resin Chemistry It's easy to assume that all polyurethane res- ins or epoxy resins would have broadly similar strengths and weaknesses as they belong to the same chemical family, but this isn't the case. Dif- ferent materials used in the part A and part B can have a big impact on the performance of the end material. Different fillers and loading can affect thermal conductivity, and various additives can influence processability, cure time, and operat- ing temperature range. An example is whether a polyurethane part A is polybutadiene (polyBD) or polyether/polyes ter based. All Resins Are Not Created Equal Sensible Design by Beth Massey, ELECTROLUBE

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