The VT-4B5H from Ventec Electronics is a Laminate with Dk (Dielectric Constant) 4.8, Df (Dissipation Factor) 0.016, Td 400 Degree C, Tg 180 Degree C, Thickness Inches 0.002, 0.003, 0.004, 0.006, 0.008 Inches. More details for VT-4B5H can be seen below.