8-LAYER IMMERSION GOLD SOFT AND HARD COMBINATION PCB NO FURTHER A MYSTERY

OSP would be the abbreviation for Natural and organic Solderability Preservatives, also referred to as bare copper, Entek. To put it simply, OSP is surely an natural skin movie that grows chemically over a clear bare copper area. This film is resistant to oxidation, thermal shock and humidity and protects the copper floor from further rusting (oxid