BS EN ISO 7668:2018 Anodizing of aluminium and its alloys. Measurement of specular reflectance and specular gloss of anodic oxidation coatings at angles of 20 degrees, 45 degrees, 60 degrees or 85 degrees

Coatings
Specular reflection
Reflection factor
Gloss (of surface)
Angles (geometry)
Aluminium
Optical measurement
Optical properties of materials
Aluminium alloys
Anodizing
Anodic coating

Link: BS EN ISO 7668:2018 Anodizing of aluminium and its alloys. Measurement of specular reflectance and specular gloss of anodic oxidation coatings at angles of 20 degrees, 45 degrees, 60 degrees or 85 degrees
Source: BSI Standards