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The N4000-7 EF from Park Electrochemical Corp is a Laminate with Dk (Dielectric Constant) 4.1 at 1 MHz, 4 at 1 GHz, Tg 165 °C. More details for N4000-7 EF 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.