本方法适用于通式M2O对应的产品。xSiO2，其中，对于硅酸钠，x的值介于1,5和3,5之间，对于硅酸钾，x的值介于1,9和3,9之间。由于溶解这些产品的细颗粒很难计数，因此首先对样品进行筛分以去除这些细颗粒。该程序包括在高压釜中处理，将试样溶解在无二氧化碳的水中。在去皮过滤坩埚上过滤和称量不溶物。将滤液稀释至给定体积，从中提取等分样品，以进行不同的测定。

The method is applicable to products corresponding to the general formula M2O. xSiO2, where the values of x lie between 1,5 and 3,5 in the case of sodium silicates and 1,9 and 3,9 in the case of potassium silicates. Because of the difficulty ancountered in dissolving fine particles of these products, the sample is first sieved to remove these fines. The procedure consists in dissolution of the test portion in carbon dioxide-free water, by treatment in an autoclave. Filtration and weighing of the insoluble matter on a tared filter crucible. Dilution of the filtrate to a given volume, from which aliquot samples are taken in order to carry out the different determinations.