What number corresponds to a standard polish in the finish/luster scale of metals?

A standard polish in the finish/luster scale of metals is characterized by a specific level of reflectivity and smoothness that differentiates it from other finishes. This scale usually ranges from a dull or rough surface at the lower end to a highly reflective, mirror-like finish at the upper end.

The value that corresponds to a standard polish is typically a 4 on this scale. A finish designated as a 4 offers a moderate level of gloss and shine, indicating it has been polished to a smooth surface without reaching the extreme reflective qualities of higher designs.

In contrast, the other values represent different types of finishes. A 2 would reflect a more matte surface with minimal luster, while a 3 may have slightly more reflectivity but still doesn't meet the criteria for a full standard polish. A 5 would denote a mirror finish, which exceeds the typical characteristics of standard polish by exhibiting a higher level of gloss and reflectivity. Understanding this scale helps in determining appropriate finishes for various applications in manufacturing, design, or engineering processes.