Mica
Fly ash
Graphite powder
Pencil graphite, graphite
Bentonite lumps
Silica sand
Kaolin
Natural expandable graphite powder
Zeolite
Ground granulated black slags
Rock phosphate
Rock phosphate
Bentonite
Mica flakes
Gypsum powder
Crystal gypsum, gypsum
Zirconium silicate
Silica sand