Tuffbond® 42121 is a thixotropic and modified epoxy adhesive that provides a very fast room temperature cure. Tuffbond® 42121 exhibits very good moisture chemical and heat resistance. This very fast cure epoxy adhesive is specially formulated for rapid in-line assembly of loud-speakers. Tuffbond® 42121 is also recommended for bonding metals, wood, ceramics, etc., and can be used for potting and encapsulation of electrical and electronic components.