Hi Victor-
The laminate doesn't swell significantly.
The problem is that when you go over about 50X optically, the depth of field becomes too small to get a clear image. There is at least one company who automatically creates a focused composite image from a motorized stage microscope, but I don't think you want to buy one (big $$). SEM doesn't have that problem.
Wayne
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Subject: [TN] PWB Laminate Swelling
Fellow TechNetters:
Does PWB laminae swell during the cross sectioning process on an encapsulated mount? During a 100x Optical inspection of the glass weave cloth I get a blur image. I get a sharp image of the glass cloth in the SEM. I can even count the individual rods and measure their diameters.
Victor,