Metallographic Preparation

DOCUMENT: Application | Ref: 200-976-016Download
Category: Analytical Elemental analysis, Grinding & Polishing, Metallography, Metallurgy and Metals

Surface Roughness

Surface roughness values are expressed in microinch units. A microinch is one-millionth of an inch (0.000001) and is abbreviated as (μin.). The American Standard specifies surface roughness measurements as an arithmetical average (AA) deviation from the mean surface. This average is somewhat less than the root mean square (RMS) average deviation which was formerly in wide use.