Abstract: Disclosed is a two-part polyurethane structural adhesive and method of bonding structural components, that exhibits at least 25 minutes of open time at 32° C. in large beads and cures to high strength under ambient conditions. The adhesive composition in one part is an isocyanate or isocyanate prepolymer and in a second part is a polyol mixture (I) or (II), wherein 75% to 100% by weight of the polyol mixture (I) or (II) are polyols having secondary hydroxyl functionality and the polyol mixture (I) or (II) contains a long chain secondary polyol defined hereinbelow. The polyol mixture in one embodiment is substantially absent short chain polyols having functionality of 2, and includes an amount from 30% to 80 % by weight on total polyol weight in (I) of long chain secondary polyol of molecular weight from 2000 to 12000 and from 20% to 70% by weight on total weight of the polyol mixture and of a short chain secondary polyol with functionality greater than 2 and a molecular weight of from 90 to 800.

Abstract: Dental X-ray films for the direct absorption of x-radiation are disclosed in which silver halide emulsion layers are coated on the opposite faces a transparent film support. To achieve direct absorption of X-radiation with the low image noise levels required for dental diagnostics while enhancing image invariance as a function of processing solution seasoning silver halide grains containing less than 5 mole percent iodide, based on silver, forming the emulsion layers are coated on each face of the support at a silver coverage of greater than 7.5 g/m.sup.2, greater than 75 percent of total grain projected area being accounted for by tabular grains having an average equivalent circular diameter of less than 5.0 .mu.m, an average thickness of less than 0.36 .mu.m, and an average aspect ratio of at least 5.