OSP will be the abbreviation for Natural Solderability Preservatives, also known as bare copper, Entek. To put it simply, OSP is surely an organic skin movie that grows chemically on a clear bare copper floor. This movie is resistant to oxidation, thermal shock and humidity and guards the copper surface https://16-layer-5-order-hdi-high84937.daneblogger.com/30374882/the-fact-about-10-layer-5g-communication-pcb-that-no-one-is-suggesting