Entrance window thicknesses

I used the ISP website on Pressure window design to recheck the thickness for our entrance windows.  The unsupported diameter is 1.85 inches for the center of the o-ring.  With the safety factor = 4, I got thicknesses of 6.6 mm for CsI and 3.0mm for KRS-5.  I had told Dana slightly different numbers, but I bet we're getting edge thickness that are close to correct.  They will at least have edge thickness sufficient to give safety factor >3.