OSP surface treatment board

4 layer osp board. Base material FR4 TG135. Finished board thickness 1.0mm.  Unit size: 93*90mm. green soldermask and white silkscreen. Need to ensure keep the solder bridge.

Organic solderability preservative is a cheap surface treatment.This surface treatment can protect the PCB board surface and facilitate PCB assembly. 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).