ZIRCAR Refractory Composites Inc is an American company producing multi shaped high performance refractory ceramics and reinforced composites.

ZIRCAR's type RSLE-57's reinforced silica matrix composite is an advanced insulation material for diamond segment sintering which reduces power consumption, improves graphite life and ensures correct distribution of heat for a better diamond segment. It also outlives traditional insulation boards by more than 10 times.