Single crystals ( LN, LT, YAG, Al2O3, YVO4 etc.), heaters ( MoSi2, SiC) for annealing furnace and single crystal furnace, high purity oxides ( high purity rear earth oxides, SiO2, Al2O3, TiO2, Ti2O3 and Ti3O5 etc.) for crystal growth and optical coatings. W, Mo crucibles and W, Mo products for srystal growth, fire-resistant materials and products for heat isolating during crystal growth.