Citric Acid → Fluthiamide Metribuzin

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In this example the molar ratio of Fluthiamide to Metribuzin is varied from about 4:1 to about 2:1. Varying the ratio allows the use of the formulation on other crops with specific dosage needs, and also demonstrates that the same pH adjusting principle is effective at more than one active ingredient ratio. In this example, a 60% total a.i. formulation was prepared by preparing a dry premix containing 40.1% Fluthiamide, 20.1% Metribuzin, 5.0% Morwet D425, 8.0% Reax 907, 4.0% Wessalon S, 2.0% Zeolex 7A, 1.5% Citric Acid, and 16.0% Barden Clay. This differs from previous examples in which a 68% total a.i. package was assembled (approximately 54.4% Fluthiamide, 13.6% Metribuzin). The dry premix was prepared using the general procedure of hammering once followed by airmilling in a 4" airmill. The premix was then granulated on a 16" pan granulator then dried in a fluid bed dryer. The final, dried Dry Flowable, which had a pH of 3.81, was then placed under accelerated elevated temperature storage as shown in Table 11.

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