Global Hexagonal BN Market By Type (Premium Grade(PG) , Standard Grade(SG) , and Custom Grade(CG)), By Application (Hexagonal BN Composite Ceramics , Preparation of Cubic Boron Nitride (CBN) , Paints & Coatings and Lubricants Industry , and Cosmetics Industry), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029