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ASTM D [ Withdrawn ].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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Does not include UV light source.

PC software for easy measurement data management. Large data storage space: Shipped in 10 days after payment.

ASTM D1925, ASTM E313 Spectrophotometer

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 makes the measurement more accurate. However, this also intensifies ISO brightness. Comparable values between two instruments can be obtained only when both are measured with the same light. Whiteness Whiteness is defined as a measure of how closely a surface matches the properties of a perfect reflecting diffuser, i.

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. Yellowness, as defined by ASTM Ehas been applied successfully to a variety of white or near-white materials, including paints, plastics, and textiles. Operation system supports both English and Chinese interfaces, and we offer to design the interface in other languages based on the need of our customers.

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Size of integrating sphere: Stensby — based on Hunter Lab color coordinates.

Whiteness and Yellowness Indices in a SpectroEye

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. Values greater than indicate a bluish white, while values less then indicate a yellowish white. 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? Standard ISO specifies a half peak width of 44 nm.

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Professional horizontal design and it does not have any moving parts, which avoids the shaking of the instrument during measurement process. The ISO brightness value indicates the blue reflection of the paper.

Whiteness and Yellowness Indices in a SpectroEye

Not exactly what you want? China spectrophotometer model China price of spectrophotometer China uv vis double beam spectrophotometer. The software contains all necessary color equations, standard light sources, and a large number of standards for specific industries and applications.

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For the purposes of this standard, the color of such a surface is known as preferred white. The optical lightener is effective only due to the UV d19225. This method is based on the use of colorimeter readings B and G. Allows medium and small companies to obtain high performance color management system with relatively low price.

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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. True color screen that includes all colors Work temperature range: In the case of non lightened samples, standard illuminant C, i.

Yellow Index YI caculation standard E D_图文_百度文库

D1295 color deviation number Tw shows additionally, if there is a red hue negative value of Tw or a green hue positive value of Tw. 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. Whiteness and Yellowness Indices in a SpectroEye Yellowness Yellowness is defined as a measure of the degree to which the color of a surface astn shifted from preferred white or colorless towards yellow.

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