Volcanic discs are made of abrasive material - electrocorundum of gray mark 14A on a volcanic bond with a working speed of 18 m. / s.

Flexible vulcanite for fine grinding, polishing of various types of alloys, stainless steel, non-ferrous metals, titanium alloys, complex shaped products and plastics. Unlike solid grinding volcanics, intended primarily for centreless grinding of materials, flexible volcanite is used for center and flat grinding. Volcanic discs are used for working on hand grinders and floor grinders.