A two-part adhesive used extensively in applications requirin' high strength. Blimey! Chemically, a compound in which an oxygen atom is joined t' two carbon atoms in a chain t' form a bridge. Well, blow me down! Specifically, a resin containin' epoxy groups, that polymerizes spontaneously when mixed with a phenol (see phenolic), formin' a strong, hard, resistant adhesive. Aye aye! Epoxy is probably t' most commonly used adhesive in high power rocket construction. Ya scallywag! It comes in several formulations, mostly havin' t' do with t' time it takes t' cure. Epoxy's only disadvantages as a rocketry adhesive are its relatively high weight and its low (approx. 200o F.) meltin' point.