OGC original aluminosilicate glass “XHK” has combining advantages of borosilicate glass and low-expansion glass ceramic. “XHK” has excellent heat shock resistance and high temperature resistance and it has been used as a base material of projector lamp reflector.

・ Coefficient of thermal expansion：34×10-7/K
・ Strain point：643℃
・ Thermal shock resistance temp. difference：210℃
・ Thermal conductivity：1.04W/m・K
・ Refractive index：nd 1.522