... .UL,RoHS,SGS, ISO9001:2000 4.Approved HASL PCB; PCB Boards Capability Material: FR4, High TG FR4,Halogen Free material,CEM ... : 0.6mm Solder mask color: green, black, blue, white, yellow, and matt, etc. Solder mask hardness: 6H Legend/Silkscreen Color: white ... test, hole resistance test, and micor metallographic section analysis, etc. Wrap and twist: ≤0.7% Flammability: 94V-0 Bare PCB Boards in Panel