ASTM E Calculating Yellowness and Whiteness Indices from Instrumentally. Measured Color Coordinates. This practice provides numbers that correlate. Yellowness indices are used chiefly to measure these types of degradation. Yellowness Index per ASTM Method E is calculated as follows. To begin the ASTM D is a now obsolete Yellowness Index specification that is locked to calculate only using C/2 (illuminant C, 2deg.
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Whiteness and Yellowness Indices in a SpectroEye
Qstm near-white specimens, however, it is often useful to calculate single-number scales of yellowness or whiteness. Test sample packaging, handling, and preparation preferably no cleaning can affect the test results by modifying the surface of the sample. The optical lightener is effective only due to the UV radiation. CIE Whiteness — Some disadvantages of the previously-mentioned indices is that a whiteness that is calculated with this formula does not differ if the measured sample has a color drift or is just less white.
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Standards can be obtained from appropriate standard authorities. Yellowness Index is a number calculated from spectrophotometric data that describes the change in color of a test sample from clear or ashm to yellow.
Some standards addressing w313 visual estimation of color and color difference are Practices DDEand Eand Guide E Whiteness and Yellowness Indices in a SpectroEye Yellowness Yellowness is defined as a measure of the degree to which the color of a surface is shifted from preferred white or colorless towards yellow.
It should be clear that the distribution of relative spectral radiation of the light on the sample during measurement plays an important role. Whether your business is local or global, we can ensure your products meet sstm, health, environmental, safety, and social accountability standards for virtually any market around the world.
Yellowness according to ASTM E D was developed specifically for determining the yellowness of homogeneous, non-fluorescent, nearly colorless, transparent, nearly white translucent, or opaque plastics, as viewed under daylight lighting conditions. It entails a filter with a maximum transmission curve of nm wavelength lambda and a specific half peak width.
Yellowness, as defined by ASTM Ehas been applied successfully to a variety of white or near-white materials, including paints, plastics, and textiles. The greater the illumination intensity in the UV-range, the more the greater the detection of the optical lightener.
Whiteness and Yellowness Indices in a SpectroEye
Global Reach Intertek is the industry leader with over 42, people in 1, locations in over countries. Since YI testing is often a series of comparative measurements over extended periods of time, these factors should be defined and documented prior to any testing.
No other units of measurement are included in this standard. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Whiteness Whiteness is defined as a measure of how closely a surface matches the properties of a perfect reflecting diffuser, i. Assurance Testing Inspection Certification. Auditing Consulting Sourcing Training.
Yellowness Index (YI) ASTM E
asgm For the purposes of this standard, the color of such a surface is known as preferred white. White textiles, paints, and plastics are a few of the materials that can be described by the indices of yellowness or whiteness calculated by this practice. Need help or have a question? In general, specimens should be prepared and presented for measurement in the manner that is standard for the test being performed.
The ISO brightness value indicates the blue reflection of the paper. This method is based on the use of colorimeter readings B and G. Stensby — based on Hunter Lab color coordinates. Multiple samples should be asrm and the readings averaged. Formally confirming that your products asm services meet all trusted external and internal standards.
Yellowness Index (YI) ASTM E313
Link to Active This link will always route to the current Active version of the standard. In the case of non lightened samples, standard illuminant C, i.
For example, a series of specimens to be compared should have asstm similar gloss, texture, and if not opaque thickness, and translucency. Send us a request Need help or have a question?