Transparency refers to the optical distinctness with which an object can be seen when viewed through plastic film/sheet, glass, etc.
In the manufacture of sheeting/film, or glass the quantitative assessment of transparency is just as important as that of haze.
Small deflections of the light, caused by scattering centers of the material, bring about a deterioration of the image.
By this, we mean that haze measurements cannot provide information about the clarity of the specimen and vice versa.
For example: Incident light = 100% - (Absorption = -1% + Reflection = -5%) = Total Transmittance = 94% ASTM International (formerly known as the American Society for Testing and Materials) is the main body which works within the industry and develops standards for various tests/instruments.