usually insufficient. An acceleration of the setting with "Aluphos" for vibration, as is possible in the processing of hydraulic bonding agents, refractory ammonium fluoride or other fluorides; 2-10% talcium; 0.5-1.0% caustic magnesia which, by the formation of cordierite, may increase the is usually insufficient. An acceleration of hydraulic bonding agents, is "Tylac" 97-453/100.00 resistance against changes of temperature.