ASTM E313 PDF

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.

No other units of measurement are included in this standard. Send us a request Need help or have a question? However, the equation is commonly used with other illuminants and observer functions, therefore the value shown will depend on the primary illuminant and the observer function you have chosen. Send us a request Wilton UK: Stensby — based on Hunter Lab color coordinates.

Standards can be obtained from appropriate standard authorities. Select enough specimens or specimen areas to provide an average result that is representative of each sample to be tested. 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 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. 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. Historical Version s – view previous versions of standard Translated E3113 s: Need help or have a question?

In general, specimens e33 be prepared and presented for measurement in the manner that is standard for the test being performed.

Satm color deviation number Tw shows additionally, if there is a red hue negative value of Tw or a green hue positive value of Tw. In the case of non lightened samples, standard illuminant C, i.

Multiple samples should be measured and the readings averaged. What is mainly annoying with the one-dimensional white evaluation is, that in the same measurement value there is a quality valuation How white is the sample?

Global Reach Intertek is the industry leader with over 42, people in 1, locations in over countries. For whiteness astn, this practice is limited to specimens having Munsell value greater than 8.

Yellowness Index (YI) ASTM E313

Standard illuminant D65 must be used for measurement of optically lightened papers. This practice provides recommended equations for such scales and discusses their derivations and uses, and limits to their applicability see also Ref 1 2. The indices can be calculated, rounded, and adjusted in the last retained significant digit to minimize the residual error in the white point values.

This test is most commonly used to evaluate color changes in a material caused by real or simulated outdoor exposure. Formally confirming that your products and services meet all trusted external and internal standards. Inspection Validating the specifications, value and safety of your raw materials, products and assets.

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.

Whiteness and Yellowness Indices in a SpectroEye

Global Gateway Please select your desired language. For the purposes of this standard, the color of such a surface is known as preferred white.

Auditing Consulting Sourcing Training. The effect occurs at approximately nm; maximum radiation is at approximately nm. Validating the specifications, value and safety of your raw materials, products and assets.

Test sample packaging, handling, and preparation preferably no cleaning can affect the test results by modifying the surface of the sample. However, the equation is commonly used with other illuminants; therefore the value shown will depend on the primary illuminant you have chosen.

Some standards addressing astmm visual estimation aastm color and color difference are Practices DDEand Eand Guide E However, this also intensifies ISO brightness. Assurance Testing Inspection Certification. The greater the illumination intensity in the UV-range, the more the greater the detection of the optical lightener.

It entails a filter with a maximum transmission curve of nm wavelength lambda and a specific half peak width. 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. Comparable values between two instruments can be obtained only when both are measured with the same light.

CIE Whiteness — Some disadvantages of the previously-mentioned indices is that a whiteness that is calculated with this formula atsm not differ if the measured sample has a color drift or is just less white. For example, a series of asym to be compared should have generally similar gloss, texture, and if not opaque thickness, and translucency.

Values greater than indicate a bluish white, while values less then indicate a yellowish white. For near-white axtm, however, it is often useful to calculate single-number scales xstm yellowness or whiteness. The ISO brightness value indicates the blue reflection of the paper. Link to Active This link will always route to the current Active version of the standard. Yellowness, as defined by ASTM Ehas been applied successfully to a variety of white or near-white materials, including paints, plastics, asfm textiles.

Yellowness Index (YI) ASTM E

Yellowness Index is a number calculated from spectrophotometric data that describes the change in color of a test sample from clear or white to yellow. Certification Formally confirming that your products and services meet all trusted external and internal standards. It should be clear that the distribution of relative spectral radiation of the light on the sample during measurement plays an important role.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Standard ISO specifies a half awtm width of 44 nm. 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.

This method is based on the use of colorimeter readings B and G. Historical Version s – view previous versions of standard.

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