Non-metal building materials, namely, toughened and semi-toughened glazing and double-glazing, laminated glazing and double-glazing, glazing and double-glazing for heat and heat/sound insulation, protection glazing and double-glazing, glazing and double-glazing for renovation purposes, photosensitive glazing and double-glazing, double-glazing with integral blinds, convex glazing, clear or tinted glass, construction glass in the nature of super-glass, clear and tinted printed glass, safety gla...