materials and characteristic

• State Standards GOST R 52381-2005 «Abrasive materials. Grit and grain distribution of grinding powders. Control of grain distribution»
• State Standards GOST R 52587-2006 «Abrasive tools. Designation and hardness measuring method»
• State Standards GOST 28818-90 «Grinding materials made from aluminum oxide. Technical conditions»
• State Standards GOST 26327-84 «Grinding materials made from silicon carbide.Technical conditions»