????? ??????? ?????????? ????? ? (????????) (quartz powder (marshalit))

Grinding powders, grinding grain-powders, micro-grinding powders including sizes from n.125 to n.5, m63 to m5; electro-corundum 14a (normal); electro-corundum white 25a; silicon carbide green 63c; silicon carbide black 53c; boron carbide of fraction minus; boron amorphous; boron nitride hexagonal. any packing up from storehouse in moscow.