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The AD260A from Arlon is a Laminate with Dk (Dielectric Constant) 3, Df (Dissipation Factor) 0.0015, CTE x-y 13, 16 ppm/°C, Thermal Conductivity 0.3 W/mK. More details for AD260A can be seen below.
Laminate for Microwave Printed Circuit Board with Enhanced Thermal Conductivity
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