... 4Good after sales service Driver PCB board for air condition compressor(OEM PCBA):Material:FR-4Layer: 4 layers Surface finish, HAL ... Solder mask: GreenSilk screen: WhiteThe othere surface finish we could do are; Gold finger, OSP, ENIG, HAL, Gold plating, Chemical silver ... , etc.The other solder mask type we could do are: Red, yellow, white, black, purpleProcessing:uses the SMT non ...