power amplifier PCB board 15 years of experience in PCB industry. Good after services. UL,SGS,ISO9001,RoHS,QS9000 and TS16949 Our PCB got UL ... to 22 layersMaterials: FR-4, CEM-3, Teflon, aluminum, Rogers, high TgSurface finishing: lead-free HASL, immersion gold/tin/silver, OSP ... 0.40mmMaximum copper thickness: 140μm (4oz)Maximum board thickness: 4.80 mmMinimum board thickness: 2L 0.20mm, 4L 0.40mm, 6 ...