Ardex FG-C MICROTEC Polar White Unsanded Grout is a high-performance, Portland cement-based grout that delivers a fuller, 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) wide on installations of porcelain, glass, quarry, ceramic, mosaic and most natural stone tiles. Freeze/thaw resistant, stain resistant, water repellent and naturally resistant to mold and mildew formation, Ardex FG-C is easy to mix and apply and can be open to traffic in just 4 hours. With excellent flexibility and high strength, Ardex FG-C is ideal for interior and exterior floors, walls, countertops and showers.