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021200-65223 - 3M Scotch-Weld Urethane Adhesive EC-3549 B/A - Quart Kit MIL-PRF-23827C Preventing seizing and galling of021200 65223 3M Scotch Weld Urethane Adhesive EC 3549 B A The 3M Scotch Weld Urethane Adhesive EC 3549 B A is a two part, room temperature curing polyurethane adhesive engineered to form tough, high peel strength structural bonds. 3 Its formulation is designed for impact resistance and long term durability across various challenging environments, making it a versatile choice for bonding dissimilar materials. 4The $\mathbf{B A}$ designation confirms it