摘要：

An improved pressure blasting product adapted for cleaning and peening operations in general but having a particular use in a method of shot peening objects made of aluminum. A substantially solid sphere of a refractory oxide material is formed that is adapted to be blasted against the object to be cleaned or tempered, preferably the sphere is a bauxite material that has been fused and subsequently solidified by air quenching to produce small spheres each having a microcrystalline structure, the spheres all being substantially solid.

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