Product Model: ISOLA FR408 High-Performance Circuit Board Base Material: ISOLA FR408 high-Tg laminate Dissipation Factor (Df): 0.012 Dielectric Constant (Dk): 3.67 Glass Transition Temperature (Tg): 180℃ Thermal Decomposition Temperature (Td): 380℃ Layer Count: 8-layer multilayer structure Finished Board Thickness: 1.2 mm Copper Weight: 1 oz Minimum Line Width / Spacing: 6 mil / 6 mil Surface Treatment: Electroless Nickel Immersion Gold