J.IIC-CG VOLUME 21 (1996)
Epoxy Resin Adhesives: Report on Shear Strength Retention on Glass Substrates
Ten room-temperature-cure epoxy resin adhesives of different chemical compositions were tested for retention of shear strength after aging in the dark at 22°C (45% relative humidity (RH)) and at 75°C (dry oven, ~2-4% RH), and under high-intensity light. The tests were carried out on glass substrates. Those epoxy formulations containing a diglycidyl ether of bisphenol A resin component and a hardener composed of a modified amine showed the highest initial shear strengths of all the products tested. Although two formulations were identified as being more resistant to loss of mechanical strength upon aging than others tested, no formulation was found to lose excessive strength under the exposure conditions employed. Loss of mechanical strength upon aging should not be a major concern when using epoxy resin adhesives on glass substrates in most conservation applications.
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