ASTM D1925 PDF

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ASTM D [ Withdrawn ].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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The optical lightener is effective only due to the UV radiation. However, this also intensifies ISO brightness.

True color screen that includes all colors Work temperature range: Jinan Xinghua Instruments Co. The effect occurs at approximately nm; maximum radiation is at approximately nm.

The idea was that chromaticity factor G-B required three times the weighting of the lightness factor G of the lightness. 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. Contact Supplier Start Order.

Values greater than indicate a bluish white, while values less then indicate a yellowish white. 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.

Whiteness Whiteness is defined as a measure of how closely a surface matches the properties of a perfect reflecting diffuser, i. It should be clear that the distribution of relative spectral radiation of the light on the sample during measurement plays an important role.

ASTM-D | Test Method for Yellowness Index of Plastics (Withdrawn ) | Document Center, Inc.

China spectrophotometer price China digital spectrophotometer China atomic absorption spectrophotometer. 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?

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This makes the measurement more accurate. Standard ISO specifies a half peak width of 44 nm. China uv spectrophotometer China spectrophotometer cuvette China uv visible spectrophotometer. 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 greater the illumination intensity in the UV-range, the more the greater the detection of the optical lightener.

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. PC software for easy measurement data management. Stensby — based on Hunter Lab color coordinates. Does not include UV light source. 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.

For the purposes of this standard, the color of such a surface is known as preferred white. 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. Yellowness, as defined by ASTM Ehas been applied successfully to a variety of white or near-white materials, including paints, plastics, and textiles.

Adding powder test accessories, easily measure the color of the Powder, granules and other samples. Comparable values between two instruments can be obtained only when both are measured with the same light.

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Whiteness and Yellowness Indices in a SpectroEye

The color deviation number Tw shows additionally, if there is a red hue negative value atsm Tw or a green hue positive value of Tw. However, the equation is commonly used with other illuminants; therefore the value shown will depend on the primary illuminant you have chosen.

It entails a filter with a maximum transmission curve of nm wavelength lambda and a specific half peak width. 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. In the case of non astn samples, standard illuminant C, i. Professional horizontal design and it does not have any moving parts, which avoids the shaking of the instrument during measurement process.

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.

ASTM D1925, ASTM E313 Spectrophotometer

Standard illuminant D65 must be used for measurement of optically lightened papers. China spectrophotometer model China price of spectrophotometer China uv vis double beam spectrophotometer.

Size of integrating sphere: Global Gateway Please select your desired language. This method is based on the use of colorimeter readings D11925 and G.