The term "roughness values" is commonly used in connection with the surface finish of materials. As a rule, it refers to the microscopic irregularities and unevenness that are present on a surface. These irregularities can be the result of manufacturing processes, natural processes or wear and tear.
In the context of bulk sampling and analysis, roughness values could be used to characterize certain properties of the material that may be relevant to its processing or use. For example, the roughness of the particle surface could influence properties such as the friction between the particles, the flow behavior of the bulk material, its tendency to clump, and others.
There are several methods for quantifying surface roughness, and the specific roughness values may vary depending on the type of material, the measurement method, and the roughness parameters chosen. Important roughness parameters can be, for example, the arithmetic center roughness (Ra), the maximum roughness depth (Rmax) or the square average roughness (Rq).
Please note that the exact meaning and use of the term "roughness values" may vary depending on the context, and it is always best to obtain additional information from the specific source or context in which the term is used.