How do ASTRA-GLAZE-SW® + blocks compare to structural glazed facing tile (SGFT); are there any advantages or disadvantages?
SGFT is available in Standard 8W Series which provides no fire rating or in 8WC PR Series which gives a one (1) hour fire rating for a 4″ wall. The fire rated units are priced so high as to be noncompetitive with ASTRA-GLAZE-SW® + units. [Note: Standard 4″ ASTRA-GLAZE-SW® + units give one (1) hour fire rating. Standard 8″ ASTRA-GLAZE-SW® + units give (2) hour fire rating. Standard 12″ ASTRA-GLAZE-SW® + units give a three (3) hour fire rating.] Standard 8W SGFT units are competitive with ASTRA-GLAZE-SW® + units in the 2″ and 4″ thicknesses but are much higher priced in 6″ and 8″ thicknesses (and in the fire rated units mentioned above) and are not available at all in 10″ or 12″ thicknesses. Having a vitrified, ceramic glazed surface, SGFT is slightly more chemical and stain resistant than ASTRA-GLAZE-SW® + units. However, like china, it is much more brittle and more easily damaged by impact. And unlike the smooth, even finish of ASTRA-GLAZE-SW® + units, SGFT surfaces tend to distort dur
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