OSP is the abbreviation for Organic Solderability Preservatives, also known as bare copper, Entek. To put it simply, OSP is really an natural pores and skin film that grows chemically with a clear bare copper surface. This movie is immune to oxidation, thermal shock and humidity and shields the copper https://8-layer-thick-copper-powe51594.kylieblog.com/31502006/top-pcb-electronic-component-for-air-conditioner-secrets