Hill and coworkers (8) on the oven drying of fresh and aged superphosphate.Two further experiments showed that the calcium sulfate in a fresh sample of single superphosphate was mostly not in the form of dihydrate and that it was resistant to hydration. In the first experiment a 100-gram sample was washed with 1.5 liters of water and dried in an air stream at 60°C. The dried sample contained 3.2% phosphorus pentoxide and yielded 1.0% moisture and only 2.5% water of crystallization on distilling with benzene and xylene, thus showing that the calcium sulfate in the superphosphate

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