Ultra fine mesh proppants are used in fracking for tight oil and gas formations. The particles are finer than conventional proppants, typically being between 70 and 140 mesh, but can be even finer than that. With any finer grade material, removing all undersize in a single pass is the key to an effective separation. The fine nature of the powder, combined with the sphericity of it can quickly clog and cause screen mesh blinding at finer meshes resulting in poor efficiencies. Furthermore, fine proppants are prone to sticking together when exposed to moisture, which can lead to inefficient screening. Many companies tend to opt for ultrasonic sieving machines or traditional vibratory screeners due to their lower entry price point but they quickly realize that these outdated technologies do not have the screen energy required to make effective particle separations at high efficiencies and yields in an industrial setting.