Yellowness of Plastic - ASTM D1925 Plastic Test Standard
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Property information for specific grades of resin are available in the Prospector Plastics Database. Property Search let's you search for plastics by more than 400 material properties. Yellowness - ASTM D1925A measure of the yellowing of a plastic, such as might occur after long-term exposure to light. The deviation in chroma from whiteness or water-whiteness in the dominant wavelength range from 570 to 580 nm as compared to a magnesium oxide standard. Yellowness is calculated using the three tristimulus values of a specimen as follows:
Positive yellowness values indicates presence and magnitude of yellowness, while a negative yellowness value indicates that a material appears bluish. Yellowness is a function of thickness, so comparison between data should be between specimens of comparable thickness. Property information for specific grades of resin are available in the Prospector Plastics Database. |
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