Note : Your Quotation Request will be directed to Taconic.
The RF-41 from Taconic is a Laminate with Dk (Dielectric Constant) 4.1 +/- 0.15, Df (Dissipation Factor) 0.0038. More details for RF-41 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.