HDI PCB with 1.0mm Board Thickness, Immersion Gold Finishing, Used for Telephone Purpose 1.UL,SGS,ROHS, ... IS09001,CE,IPC HDI PCB with 1.0mm Board Thickness, Immersion Gold Finishing, Used for Telephone Purpose 1.Base Material:FR42 ... Excellent Quality Assurance HDI PCB with 1.0mm Board Thickness, Immersion Gold Finishing, Used for Telephone Purpose