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ZrO2+HfO2	SiO2	Fe2O3	TiO2	Ig.loss	Y2O3	—±“x
89.0 (Min%)	0.30 (Max%)	0.30 (Max%)	0.40 (Max%)	0.50 (Max%)	7.5%�`8.5%	#8, #20, #40, #100, #200, #350, 325F