Ingredients in Jointing Sand | Sciencing
Sand, or silica, makes up 80 percent to 95 percent of the mixture and is the primary ingredient in jointing sand. It is often called polymeric sand because of the chemical binder that is put into the mixture. The sand that is used is the same sand used in bags of play sand for filling a child''s sand box and in blending with other ingredients to make cement or concrete mixtures.