ARDEX FG-C MICROTEC Unsanded Floor & Wall Grout is a high-performance, Portland cement-based, unsanded grout that delivers fuller, more aesthetically pleasing grout joints with an ultra-smooth finish for floor and wall tile joints up to 1/4? (6 mm) or porcelain tile joints up to 1/8? (3 mm). Use for installations of porcelain, glass, quarry, ceramic and mosaic tile, as well as most natural stone tiles. ARDEX FG-C is freeze/thaw stable, naturally resistant to mold and mildew formation and can be open to traffic in just 4 hours. With its flexibility and high strength, ARDEX FG-C is ideal for interior and exterior floors, walls, countertops and showers.