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The IS620i from Isola Group is a Laminate with Dk (Dielectric Constant) 4, Df (Dissipation Factor) 0.006, Td 364 °C, Tg 225 °C. More details for IS620i 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.