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ASTM D [ Withdrawn ].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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Yellow Index YI caculation standard E D_图文_百度文库

However, the equation is commonly used with other illuminants; therefore the value shown will depend on the primary illuminant you have chosen. The ISO brightness value indicates the blue reflection of the paper.

D1295 powder test accessories, easily measure the color of the Powder, granules and other samples. Its sstm 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.

It should be clear that the distribution of relative spectral radiation of the light on the sample during measurement plays an important role. Shipped in 10 days after payment.

PC software for easy measurement data management. 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.

Allows medium and small companies to obtain high performance color management system with relatively low price. The indices can be calculated, rounded, and adjusted in the last retained significant digit to minimize the residual error in the white point values. China spectrophotometer model China price of spectrophotometer China uv vis double beam spectrophotometer.

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ASTM-D | Test Method for Yellowness Index of Plastics (Withdrawn ) | Document Center, Inc.

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.

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. D192 horizontal design and it does not have any moving parts, which avoids the shaking of the instrument during measurement process. Whiteness Whiteness is defined as a measure of how closely a surface matches the properties of a perfect reflecting diffuser, i.

Stensby — based on Hunter Lab color coordinates. Comparable values between two instruments can be obtained only when both are measured with the same light. True color screen that includes all asgm Work temperature range: The idea was that chromaticity factor G-B required three times the weighting of the lightness factor G of the lightness. This makes the measurement more accurate. It entails a filter with a maximum transmission curve of nm wavelength lambda and a specific half peak width.

China spectrophotometer price China digital spectrophotometer China atomic absorption spectrophotometer. This method is based on the use of colorimeter readings B and G. 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.

In the case of non lightened samples, standard illuminant C, i. The optical lightener is effective only due to astmm UV radiation. For the purposes of this standard, the color of such a surface is known as preferred white.

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Does not include UV light source. Standard illuminant D65 must be used for measurement of optically lightened papers. Not exactly what you want? The software contains all necessary color equations, standard light sources, and a large number of standards for specific industries and applications.

ASTM D1925, ASTM E313 Spectrophotometer

Contact Supplier Start Order. Values greater than indicate a bluish white, while values less then indicate a yellowish 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 is shifted from preferred white or colorless atm yellow. The color deviation number Tw shows additionally, if there is a red hue negative value of Tw or a green hue d925 value of Tw.

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

Size of integrating sphere: Large data storage space: Jinan Xinghua Instruments Co. It can also be applied to materials other than plastic fitting this description. Yellowness according to ASTM E D was developed specifically d925 determining the yellowness of homogeneous, non-fluorescent, nearly colorless, transparent, nearly white translucent, or opaque plastics, as viewed under daylight lighting conditions.

However, this also intensifies ISO brightness.