... 3.UL,RoHS,SGS, ISO9001:2000 4.11 years PCB experience. PCB Boards Capability Material: FR4, High TG FR4,Halogen ... Free material,CEM-3, Rogers HF material, etc. Layer counts: ... PTH Hole: 0.1mm Max. Board Thickness/Hole Ratio: 12:1 Min. Solder Mask Bridge: 4mil (Min. SMT ... Wrap and twist: ≤0.7% Flammability: 94V-0 PCB for Electronic LED Products