Loctite 331 is a toughened acrylic adhesive with medium viscosity. This adhesive is designed for bonding metal substrates and is well suited for DC motor assembly, magnet bonding and bonding of pre-coated sheet metal. The cured product provides high shear and impact strength with excellent environmental and chemical resistance. Loctite 331 Structural Adhesive is a two step acrylic, toughened, activator-cure adhesive. It is acid-free, non-corrosive to sensitive parts, fixtures in 20 seconds and develops full strength in 30 min. Excellent high temperature resistance. Ideal for bonding close-fitting metals and magnets.