PCB Layer count: 6 layers PCB PCB Material: FR-4 with Tg170 PCB thickness: 1.6 mm +/-0.16mm PCB Surface Technique: Immersion gold: 2u" min PCB Finished copper thickness: 2oz for all layers PCB Minimum hole size: 0.25mm for through plating hole PCB Track width/spacing: 4mil/4mil PCB Solder Mask Color: Light Green (Taiyo PSR4000) Specialty: Telecommunication PCB PCB Specification: IPC class 2 Remark: All PCB from TP conform to international standards in accordance with MIL, IPC, UL and RoHS. We also conform to the quality standard as ISO 9000 and ISO14000;