Portland cement dry grout used for joints up to 1/8"wide. For highly glazed ceramic tile or highly polished marble or natural stone that can be scratched by sanded grouts. Use on floors, countertops, walls, ceilings, showers, fountains and pools. Non-shri nking and durable. Meets ANSI A118.6 specifications. Rated (ASTM C67) for residential to extra heavy commercial use.