Jul 26, 2019 Kiln Dry Silica Sand 30. Kiln Dry Silica sand is the most economical infill and is available in two sizes 16 and 30 which are suitable for different type of grass applications. Smaller grains of 30 Silica Sand is applicable for putting greens. 16 Silica sand is standard for landscape applications of any kind. 100 lbs per box.Silica sand differs from regular sand as by definition, it must have 95 SiO2 (silicon dioxide) and less than 0.6 iron oxide. Because of its purer composition compared to ‘regular’ sand – which contains less than 80 SiO2 – it’s much less chemically reactive. It is added to artificial turf as infill because it.