... , Blue Solder Mask, Vias Plugged with Solder Mask, RoHS Compliance. 2-Layer PCB,Gold Finger,Blue Solder Mask,Vias Plugged with Solder ... % Insulation Resistance1E+12Ω(Normal) Thermal Shock 3x10Sec@288 Centigrade DegreeWarp and Twist<= 0.7%Electric Strength> 1.3KV/mmPeel Strength1.4N ... , Peelable Mask, Carbon PrintingMaterialFR4, ROGERS, Taconic, ARLON, BT, Ceramic, Aluminum 2-Layer PCB with Gold Finger