The 5870 from Rogers Corporation is a Laminate with Dk (Dielectric Constant) 2, Td 500 °C, Thickness Inches 0.005” (0.127mm), 0.010” (0.254mm), 0.015” (0.381mm), 0.020” (0.508mm), 0.031” (0.787mm) 0.062” (1.575mm) 0.125” (3.175mm), Thermal Coeffecient 28 ppm/°C. More details for 5870 can be seen below.