A rapid method of disaggregating sandstones was investigated, with emphasis on reducing specimens to individual grains without destroying surficial or volumetric parameters. Specific quantities of samples were used to test three ultrasonic generators with focused horns utilizing varying degrees of acoustical intensity and frequencies for preset periods of time. Results indicate that (1) ultrasonic energy with acoustical power input between 55 and 100 watts per cm 2 and a frequency of 10 to 20 kilocycles per second can be successfully used to disaggregate friable to moderately cemented sandstones, (2) lower frequencies and higher intensities promote disaggregation and reduce the time required, and (3) rate of disaggregation is a function of the type of cementing materials involved, and may be controlled by the shape and volume of irradiation chamber and the pressure within the chamber.

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