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The CER-10 from Taconic is a Laminate with Dk (Dielectric Constant) 10.0 nominal +/- 0.50, Df (Dissipation Factor) 0.0035. More details for CER-10 can be seen below.
Laminate for Microwave Printed Circuit Board with Enhanced Thermal Conductivity
You can now find similar products from multiple companies on everything RF.