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Two separate investigations are discussed concerning effect of early joint movements. 1. Continuous Cycling While Curing The overall physical properties of sealants cured in a joint undergoing continuous +/- 10% deformation for one week are compared to those of sealants cured under static conditions. Acetoxy, benzamide, alkoxy and oxime systems were studied. 2. “Crack Test” Freshly prepared joints of different formulations were elongated to 25% of their original width starting 15 minutes after preparation. The effect on the surface and body of the sealants as well as the displacement from substrate was observed.
This test, the so called “crack test” was performed on acetoxy, benzamide, alkoxy, amine, and oxime.
Early joint movement, cracking, curing systems, oxime cure
Market Applications Manager, Allied-Signal, Morristown, NJ