Yellowness Index (YI) ASTM E313

Yellowness Index (YI) ASTM E313

Determination of Yellowness Index (YI) by ASTM E313 is done to assess color changes in a substance caused by actual or simulated outdoor exposure. The test is performed using BYK Gardner Spectrophotometer which is highly automated.


    The Yellowness Index is a number derived from spectrophotometric data that defines the transition from clear to yellow in the color of a test sample. The most common application of this test by ASTM E313 is to assess color changes in a substance caused by actual or simulated outdoor exposure.

    Test Procedure:

    The BYK Gardner Spectrophotometer has a high degree of automation. The test sample is placed into the specimen holder, and the spectrophotometer takes the reading after determining the illuminant, observer angle, and reference color. Many samples are analyzed and the results are combined. Test sample packaging, handling, and preparation may affect the test results. These factors should be identified and reported prior to any YI testing since it is often a series of comparative measurements over long periods of time.

    Sample size:

    A sample size of 100 mm disk is generally used.


    Yellowness Index (YI)


    Core Materials Testing Services


    A variety of microscopy and spectroscopy tools available for precise measurements from the nano to the meter scale.

    Metrology Testing Services


    TEM SIMS Profilometry

    Materials Testing

    ASTM and ISO standard and custom chemical, mechanical, thermal, corrosion tests, etc. for all materials metals, ceramic or polymers.

    Materials Testing Services


    Nondestructive Testing Electrical Testing Chemistry Analysis

    Product Testing

    Thousands of tests for product quality and reliability under heat, humidity, temperature shock, vibration, drop, electrostatic discharge.

    Product Testing Services


    Vibration Testing Humidity Testing Accelerated Aging

    Looking for Material Testing?

    We have 500+ Material Test already Done for top companies

      Send us a request