In our field (medical nuclear imaging), the only optical cement is from Bicron Corporation (now Saint Gobain); this cement is not strong enough to withstand sawing unless the gluing surface has a cross-section larger than 2mm by 10mm; it is a little rubber like after curing. This is why I am...
I am looking for highly transparent epoxy for gluing/bonding a sandwich of optical crystal-"mirror film"-crystal together. The epoxy transparency should not age (operating temperature at 35C). The material should be strong as the sandwiches will be saw-cut later into thin 1.5mm slices/strips...