Organic solderability preservative circuit board

Double side Organic Solderability Preservative printed circuit board. Organic solderability preservative is a cheap surface treatment.This surface treatment can protect the PCB board surface and facilitate PCB assembly. Its advantage is that it is easy to weld.this kind of PCB boards need to complete PCB assembly within three months. The board thickness from 0.2 mm to 6.0 mm, size from 5*5 mm to 600*650 mm can use the surface treatment of organic solderability preservative(Short name is OSP)