A particulate such as silicon carbide is recommended over a softer garnet particulate when used to clean and profile harder metal pipes, such as steel, where the metal is a softer, such as copper it can be cleaned and profiled with a less hard particulate such as garnet.TABLE 2PARTICULATE SIZESIEVE SIZE OPENINGU.S. MeshInchesMicronsMillimeters4.18747604.768.093723802.3816.046911901.1925.0280710.71