First of all, surface finish and surface roughness are the same concept, and surface finish is another term for surface roughness. The surface finish is put forward according to the human visual point of view, and the surface roughness is put forward according to the actual surface micro-geometry. Because of the conformity with international standards (ISO), China adopted surface roughness and abolished surface finish in the 1980s. After the promulgation of the national standards for surface roughness GB3505-83 and GB1031-83, the surface finish is no longer used.
There is a corresponding comparison table for surface finish and surface roughness. Roughness has a calculation formula for measurement, and smoothness can only be compared with a model gauge. Therefore, the roughness is more scientific and rigorous than the finish.
The surface glossiness indicates the strength of the diffuse reflection of light on the surface of the object. From the naked eye, if the surface diffuse reflection is strong, it is closer to the specular effect, and the glossiness is high. On the contrary, if the surface diffuse reflection is weak, the glossiness is low. Therefore, gloss is also called mirror gloss. The influencing factors of surface gloss are related to the physical properties of the surface and the chemical properties of the materials used on the surface. The method of detecting the surface glossiness of an object requires the use of a surface gloss meter.
