Manufacturing instructions are similar to those given for Formulas No.1 and No.2. However, in the case of Formula No.3, the laboratory of the Corps of Engineers at Fort Belvoir Va., prefers an alternate manufacturing procedure. The dispersion should be satisfactory in the pebble mill by the end of 24 hours, if the mill is not overloaded. At the end of 12 hours' grinding, the mill is stopped and the phosphoric acid added while the contents are still warm. The mill is then allowed to run for the remaining 12 hours, when the balance of the acid component is added. In this way an increase in stability and performance is obtained. The three formulas shown in this table may all be pre-mixed with a stability of at least 6 months.
地址：山东省烟台市开发区南昌大街48号
