| abstract |
Synthetic raw materials are used to prepare a sintered refractory body consisting essentially of doped cordierite having from about 47.5 to about 56 weight percent SiO 2 , from about 31 to about 40 weight percent Al 2 O 3 , from about 12 to about 19 weight percent MgO, from about 0.15 to about 1 weight percent CaO, from zero to 250 ppm Na 2 O, and from zero to about 150 ppm K 2 O, the body having a flexural strength of at least about 20,000 psi (about 140 MPa). |