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SiO2	>73%
Al2O3	17-25%
Fe2O3	<1.0%
CaO	<0.5%
MgO	<0.5%
K2O+Na2O	2-4%
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�ߴ� (mm)	�� (mm)	�ȱ��e (m2/m3)	��϶�� (%)	�ѷe��(g��)��(sh��) (��(g��)/m3)	�ѱ�� (Kg/m3)
80	8	120	54	1950	916
100	10	110	53	1000	930
150	15	60	58	296	960