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 -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of [log in to unmask] Sent: Wednesday, March 08, 2017 8:22 AM To: [log in to unmask] 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,