cb Board thickness: 1.60 +/- 0.16mm . Pcb Minimum drill diameter: 0.25mm for through plating hole . Pcb Aspect ratio: 8.0: 1 . Pcb Line/space: 4mil/4mil . Pcb Solder mask: Light Green with Taiyo PSR4000 . PCB Surface finish: Immersion gold: 2u" min . PCB Material: Shengyi S1140 . Pcb material Tg: 140 . PCB Application: Medical equipment . Press fit plating hole with tolerance: +/-0.05mm . PCB manufactre specification: IPC class 2