ASTM D1925 PDF

ASTM D [ Withdrawn ]. Standard Test Method for Yellowness Index of Plastics. standard by ASTM International, 01/22/ View all. wnessIndex was developed for the definition of the Yellowness of homogeneous, non-fluorescent, almost. Yellowness – ASTM D A measure of the yellowing of a plastic, such as might occur after long-term exposure to light. The deviation in chroma from.

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Size of integrating sphere: True color screen that includes all colors Work temperature range: The ISO brightness value indicates the blue reflection of the paper. It can also be applied to materials other than plastic fitting this description.

The indices can be calculated, rounded, and adjusted in the last retained significant digit to minimize the residual error in the white point values. Allows medium and small companies to obtain high performance color management system with relatively low price. Shipped in 10 days after payment. Its derivation assumed that, because of the limitation of the concept 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. This makes the measurement more accurate. Standard illuminant D65 must be used for measurement of optically lightened papers.

Whiteness and Yellowness Indices in a SpectroEye

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. The optical lightener is d192 only due to the UV radiation.

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Not exactly what you want? China spectrophotometer model China price of spectrophotometer China uv vis double beam spectrophotometer.

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. China spectrophotometer price China digital spectrophotometer China atomic absorption spectrophotometer. However, this also intensifies ISO brightness. Global Gateway Please select your desired language.

Zstm method is based on the use of colorimeter readings Wstm and G. Values greater than indicate a bluish white, while values less then indicate a yellowish white. Comparable values between two instruments can be obtained only when both are measured with the same light.

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? Professional horizontal design and it does not have any moving parts, which avoids the shaking of the instrument during measurement process.

The greater the illumination intensity in the UV-range, the more the greater the detection of the optical lightener.

ASTM-D | Test Method for Yellowness Index of Plastics (Withdrawn ) | Document Center, Inc.

Adding powder test accessories, easily measure the color of the Powder, granules and other samples. Jinan Xinghua Instruments Co.

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It should be clear that the distribution of relative spectral radiation of the light on the sample during measurement plays an important role. In the case of non lightened samples, standard illuminant C, i.

Yellowness, as defined by ASTM Ehas been applied successfully to a variety of white or near-white materials, including paints, plastics, and textiles. 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. China uv spectrophotometer China spectrophotometer cuvette China uv visible spectrophotometer.

However, the equation is commonly used with other illuminants; therefore the value shown will depend on the primary illuminant you have chosen.

ASTM D1925, ASTM E313 Spectrophotometer

Standard ISO specifies a half peak width of 44 nm. The idea was that chromaticity factor G-B required three times the weighting of the lightness factor G of the lightness. For the purposes of this standard, the color of such a surface is known as preferred white. Professional design, powerful instrument functions Professional horizontal design and it does not have any moving parts, which avoids the shaking of the instrument during measurement process.

PC software for easy measurement data management.