The AD255C-IM from Rogers Corporation is a Laminate with Dk (Dielectric Constant) 2.55 to 2.58, Df (Dissipation Factor) 0.0014, Td 550 Degree C, Thickness Inches 0.030 Inches, 0.060 Inches, Thickness 0.762 mm, 1.524 mm. More details for AD255C-IM can be seen below.