TEC 15030457 AccuColor 40 lb AccuColor Premium Unsanded Grout Ta-620 / 912 Optic White is an unsanded cement grout that is specially formulated to assure you of smooth, color consistent, dense joints, even in hot, dry conditions or with highly absorptive tile. Designed for grouting small joints up to 1⁄8" (3 mm), primary uses include walls, tub enclosures and countertops. It's also used for grouting marble and other natural stone floor, where sanded grouts could scratch delicate tile surfaces.