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ASTM D [ Withdrawn ].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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Large data storage space: In the case of non lightened samples, standard illuminant C, i. Adding powder test accessories, easily measure the color of the Powder, granules and other samples. Global Gateway Please select your desired language. China uv spectrophotometer China spectrophotometer cuvette China uv visible spectrophotometer.

The idea was that chromaticity factor G-B required three times the weighting of the lightness factor G of the lightness. Size of integrating sphere: 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.

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

It entails a filter with a maximum transmission curve of nm wavelength lambda and a specific half peak width. However, this also intensifies ISO brightness. Comparable values between two instruments can be obtained only when both are measured with the same light. The optical lightener is effective only due to the UV radiation.

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

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. 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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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 can also be applied to materials other than plastic fitting this description.

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.

Standard illuminant D65 must be used for measurement of optically lightened papers. 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.

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.

True ast, screen that includes all colors Work temperature range: China spectrophotometer price China digital spectrophotometer China atomic absorption spectrophotometer.

Stensby — based on Hunter Lab color coordinates.

The greater the illumination intensity in the UV-range, the more the greater the detection of the optical lightener. Standard ISO specifies a half peak width of 44 nm. The ISO brightness value indicates the blue reflection of the paper.

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. This makes the measurement more accurate. Does not include UV light source. The effect occurs at approximately nm; maximum radiation is at approximately nm. 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.

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Whiteness Whiteness is defined as a measure of how closely a surface matches the properties of a perfect reflecting diffuser, i. PC software for easy measurement data management.

Whiteness and Yellowness Indices in a SpectroEye

This method is based on the use of colorimeter readings B and G. However, the equation is commonly used with other illuminants; therefore the value shown will depend on the primary illuminant you have chosen. Yellowness, as defined by ASTM Ehas been applied successfully to a variety of white or near-white materials, including paints, plastics, and textiles.

Values greater than indicate a bluish white, while values less then indicate a yellowish white. For the purposes of this standard, the color of such a surface is known as preferred white.

Whiteness and Yellowness Indices in a SpectroEye

Professional horizontal design and it does not have any moving parts, which avoids the wstm of the instrument during measurement process. Contact Supplier Start Order. Jinan Xinghua Instruments Co. 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.

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