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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Enabling you to identify and mitigate the intrinsic risk in your operations, supply chains and business processes. Comparable values between two instruments can be obtained only when both are measured with the same light.
The indices can be calculated, rounded, and adjusted in the last retained significant digit to minimize the residual error in the white point values. It is the responsibility of the user of this aatm to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. However, the equation is commonly used with other illuminants; therefore the value shown will depend on the primary illuminant you have chosen.
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.
Yellowness Index is a asstm calculated from spectrophotometric data that describes the change in color of a test sample from clear or white to yellow. Link to Active This link will always route to the current Active version of the standard. For example, a series of specimens to be compared should have generally similar gloss, texture, and if not opaque thickness, and translucency.
Stensby — based on Hunter Lab color coordinates. The effect occurs at approximately nm; maximum radiation is at approximately nm. Assurance Testing Inspection Certification. The ISO brightness value indicates the blue reflection of the paper.
Whiteness and Yellowness Indices in a SpectroEye
Need e31 or have a question? After specifying the illuminant, observer angle, and the reference color, the test sample is inserted into the specimen holder, and the spectrophotometer takes the reading. The greater the illumination intensity in the UV-range, the more the greater the detection of the optical lightener. Formally confirming that your products and services meet all trusted external and internal standards. Validating the specifications, value and safety of your raw materials, products and assets.
Historical Version s – view previous versions of standard. Yellowness according to ASTM E D was developed specifically for determining the yellowness of homogeneous, non-fluorescent, nearly colorless, transparent, nearly white translucent, or e33 plastics, as viewed under daylight lighting conditions.
This test is most commonly used to evaluate color changes in a material caused by real or simulated outdoor exposure.
Standards can be obtained from appropriate standard authorities. Its derivation assumed that, because of the limitation of the w313 to yellow or blue colors, it was necessary to take account of variations in the amber or red colorimeter readings. Whiteness Whiteness is defined as a measure of how closely a surface matches the properties of a perfect reflecting diffuser, i. Some standards addressing the visual estimation of color and color difference are W313 DDE sstm, and Eand Guide E Multiple samples should be measured and the readings averaged.
For whiteness measurement, this practice is limited to specimens having Munsell value greater than 8. Global Gateway Please select your desired language. What is mainly annoying with the one-dimensional white evaluation is, that in the same measurement value there asm a quality valuation How white is the sample? In general, w313 should be prepared and presented for measurement in the manner that is standard for the test being performed. Because visual observing conditions can vary widely, users should compare calculated indices with visual estimates to ensure applicability.
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Values greater than indicate a bluish white, while values less then indicate a yellowish white. Assurance Enabling you to identify and mitigate the intrinsic risk in your operations, supply chains and business processes. For the purposes of this standard, the color of such a surface is known as preferred white. However, this also intensifies ISO brightness. The color deviation number Tw shows additionally, if there is a red hue negative value of Tw or a green hue positive value of Tw. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Inspection Validating the asgm, value and safety of your raw materials, products ast, assets. Historical Version s – view previous versions of standard Translated Version s: The idea was that chromaticity factor G-B required three qstm the weighting of the lightness factor G of the lightness.
No other units of measurement are included in this standard.
Yellowness Index (YI) ASTM E313
Whether your business is local or global, we can ensure your products meet quality, health, environmental, safety, and social accountability standards for virtually any market around the world. In the case of non lightened samples, standard illuminant Asfm, i. Auditing Consulting Sourcing Training. This method is based on the use of colorimeter readings B and G.
Yellowness Index (YI) ASTM E
Testing Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards. Global Reach Intertek is the industry leader with over 42, people in 1, locations in over countries. Test sample packaging, handling, and preparation preferably no cleaning can affect the test results asttm modifying the surface of the sample.