IDES
Plastics   Generics   Properties   Manufacturers   Articles   Webinars
Login to Prospector
Don't have an IDES account?
Create an account now
Home > Resources > Material Properties

Yellowness of Plastic - ASTM D1925 Plastic Test Standard

Share This Page Share This Page  •  Free Access to 80,000 Datasheets

Yellowness - ASTM D1925

Purchase and download official ASTM standards today!

A 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:
Yellowness = [100(1.28XCIE - 1.06ZCIE)]/YCIE
where XCIE is the tristimulus value for Red,
YCIE is the tristimulus value for Green,
and ZCIE is the tristimulus value for Blue. (CIE stands for the Commission International de l'Eclairage).

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.
If you already have an account, you can login here or you can register for free, instant access:

Join the IDES Network:   Email Alerts  •  Blog  •  Twitter  •  LinkedIn

Share This Page - Services - Advertise With Us - About IDES - Contact Us NA: 800-788-4668, 307-742-9227  |  EU: 0033 (0) 471 759 577 Chat ©1986- IDES