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34 DESIGN007 MAGAZINE I JANUARY 2021 and are used in a multitude of combinations; your fabricator can help you find the best laminate solution for your needs. Chart 1 and Chart 2 show a variety of performance specifi- cations for Isola and DuPont laminates. Physical (thermal) parameters: • (Tg)—Glass transition is the transition temperature at the lower end of the thermal excursion, whereby the resin changes from a semi-solid state to a rubbery state. This is very important for high layer-count boards. • (Td)—Decomposition temperature is at the higher end of the thermal excursion, whereby the material may start to decom- pose or breakdown from excess heat. This is very important for boards that may Chart 1: Isola rigid laminate specs. Chart 2: DuPont flexible polyimide specs.

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