As a China PCBA vendor,it would be a big mistake to send a quote and then wait for a deal,we must first stand on the customers point of view to understand the customers ideas.
PCB manufacturers in the production process of grinding board, etching, electroplating, Hole metallization, development, striping and other processes will produce waste water.
Whatever the internal quality is, the surface is almost the same. The internal differences is very important in the life of the PCB in the durability and function
In order to adapt to the development of electronic products, PCB circuit boards from simple single-sided PCB transit to double-sided/multilayer PCB/blind buried circuit board/multilayer impedance board, until todays high-density HDI circuit board