铸造用水玻璃粘结剂的主要参数之一是模数。模数的测定、采用什么方法较理想、造选用何种指示剂为合理、目前尚无定论。本文以理论推算和实验数据为依据,提出以澳甲酚紫为单一指示剂,用特殊的取样方法,特定的浓度比的标准,快速测定模数。本法终点明显、操作简便、计算简单、 One of the main parameters for casting water glass binders is modulus. Determination of modulus, what method is more ideal, made using what kind of indicator is reasonable, there is no conclusion. In this paper, theoretical calculations and experimental data as the basis, the proposed cortisol purple as a single indicator, with a special sampling method, the specific concentration ratio of the standard, rapid determination of modulus. The end of this method is obvious, easy to operate, simple calculation,