Gray Scale Determination
This test method is used to determine optical surface changes induced by various stresses.
These stresses can include processing, after-treatment, light aging, weathering and temperature aging. The difference in color between a specimen that has been exposed to light and an unexposed specimen is compared with the gray scale sections. The light-exposed specimen is given the number closest to the color fastness level on the gray scale.
| Test specimen | Sample sheet |
| Basic dimensions | 60 mm x 40 mm x d |
Gray scale for determining color differences
