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one of the more common requests we receive at stns is to evaluate for hyper corrosion of enig and enap pig plated pwbs this is a requirement for conformance testing uh typically to IPC 4552 or IPC 4556 there are a clear pass fail criteria teria for hyper corrosion levels present on a coupon it is a requirement to evaluate at initially lower magnification typically 200x to pick the worst feature in the cross-section coupon and then to evaluate it further at 1,000x to evaluate anything at 1,000x that the cross-section Mount be pler and that the epoxy has excellent Edge or tension to the sample to achieve this stns uses the best epoxies that are on the market and as can be seen we use semi-automated polishing grinding equipment to do this now we will go and evaluate a coupon under the microscope and show how the evaluation has performed with the grinding and polishing complete of this cross-section we can now begin the initial evaluation for hyper corrosion as can be seen as we go across
