Durability of R. F. Cured Urea Bonds

Twelve-year correlation data are presented on the durability of radio-frequency curing of urea bonds. The investigation was limited to only one brand of urea resin adhesive. The conclusions reached were: 1) The use of R.F. heating for curing urea-resin glue bonds is not detrimental to the durability of such bonds under normal interior exposure conditions. 2) The power concentration or the rate of cure employed with an R.F. heating process does not influence the durability of urea-resin glue bonds, provided the power concentration is not sufficiently high to cause burning or charring in the gluelines. 3) The weatherometer treatment employed as an accelerated aging test provided a satisfactory method for quickly evaluating the quality and durability of the glue bonds regardless of the method used for curing the bonds. In that all bonds were of high quality, and apparently of equal durability, the results of this study do not indicate if the treatment would distinguish bonds of lesser durability. The cyclic-soak treatment employed as an accelerated aging test produced significantly less deterioration in the bonds cured at room temperature than in the bonds cured under any other condition. For this reason, it was not satisfactory as an accelerated test for comparing the long-term durability of the bonds under normal interior condition.

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