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The AD350A from Arlon is a Laminate with Dk (Dielectric Constant) 4, Df (Dissipation Factor) 0.003, CTE x-y 5, 9 ppm/°C, Thermal Conductivity 0.45 W/mK. More details for AD350A can be seen below.
Laminate for Microwave Printed Circuit Board with Enhanced Thermal Conductivity
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