1.UL,SGS Test,RoHS and ISO9001:2008 2.1-16 layer,FR-4,Alu 3. Immersion gold,HASL,OSP 4. 9 years of PCB factory experience Black Mask FR-4 PCB Board Sampling based on customized gerber or original sample:Double sided: Sample lead time: 2-3 daysMultilayer: Sample lead time: 3-4 daysMass production: Production lead time: Double sided: 5-7days Multilayer: 7-10 days Remark: (since the date of received ...