Thoroughly or properly annealed (in various senses).

Of metal, glass, etc.: subjected to a process of heating and (typically slow) cooling in order to remove internal stresses and reduce…

Of glass: toughened in the course of manufacture; spec. bulletproof. Cf. armour glass n. at armour, n. compounds.

Supported, strengthened, or stiffened with wire; (of glass) strengthened by wire mesh.