Grog (also called firesand) is a type of pre-fired clay that has been ground and screened to a specific particle size. For the town in the United States, see Clay, New York. ...

Grog is used in pottery and sculpture to add a gritty, rustic texture called "tooth". Grog also reduces shrinkage and promotes even drying. Grog adds structural strength to hand-built and thrown pottery. A man shapes pottery as it turns on a wheel. ... Sculptor redirects here. ...

Grog is a critical ingredient in ceramic rocket motor nozzles and bulkheads. Grog particles have sharp edges and angles which lock the clay structure together and prevent the clay layers from being ripped out by the supersonic exhaust jet. A rocket is a vehicle, missile or aircraft which obtains thrust by the reaction to the ejection of fast moving exhaust from within a rocket engine. ...