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3M Scotch-Weld Acrylic Adhesive Accelerator A3-1 is the accelerator (Part A) of a two-part acrylic adhesive, engineered to be used with a B/A system. This accelerator is designed to use with 3M Scotch-Weld Acrylic Adhesives DP8405NS, DP8410NS and DP8425NS. The fast rate of cure from this system provides rapid strength build-up and produces tough, impact-resistant bonds.