ASTM D4459 PDF

More D In addition, the viscosity of many petroleum fuels is important for the estimation of optimum storage, handling, and operational conditions. Thus, the accurate determination of viscosity is essential to many product specifications. Scope 1. If, however, the viscosity varies significantly with the rate of shear, different results may be obtained from viscometers of different capillary diameters.

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Indeed, the purpose of this method is to simulate the effects that are engendered by a solar radiation through glass with an exposure to a glass filtered Xenon arc illuminating light source. Click and Receive a quote within the next 4 hours.

Xenon-Arc exposure of plastics for indoor applications The ASTM D standard mainly tries to characterize the evolution of the aesthetics of the plastic over time. More specifically, this method aims to appraise the color differences of the sample in accordance with the ASTM D test protocol. In order to determine the variation of that property in terms of exposure time or radiant exposure, it is necessary to perform a periodical evaluation of the specimen.

The time or radiant exposure required to provoke a certain property change can be used to ascertain the stability of materials. Furthermore, in order to foresee the performance of the sample into the field, it is necessary to have the appropriate acceleration factor.

As a matter of fact, employing an acceleration factor that was obtained through an outdoor exposure or of another product will lead to flawed projections, because this factor is attributed to a specific material for a given situation.

Lastly, even though a Xenon-arc light exposure is essentially used to assess the aesthetics, because the light source has an emission spectrum that matches the portion of the solar spectrum responsible for causing color fading, other properties may be gauged as well if this practice is coupled with the right methods.

Typical experimental parameters for ASTM D testing The number of samples required is three and it is recommended to test them alongside a material of known performance, so that the latter one can be used as a control. The specifications of the test are listed in table 1.

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ASTM D4459

This practice uses exposure in a xenon-arc device equipped with window glass filters and operated in accordance with Practices G and G Therefore, all references to the use of this practice must be accompanied by a report prepared in accordance with Section 9 that describes the specific operating conditions used. Refer to Practice G for detailed information on the caveats applicable to use of results obtained in accordance with this practice. Note 3—Additional information on sources of variability and on strategies for addressing variability in the design, execution and data analysis of laboratory accelerated exposure tests is found in Guide G Significant factors include regulation of line voltage, temperature and humidity control, and condition and age of the lamps and filters. It is recommended that at least three replicates of each material be exposed to allow for statistical evaluation of results.

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ASTM D4459 – 屋内用途向けプラスチックのキセノン・アーク暴露の標準プラクティス

More D This practice uses exposure in a xenon-arc device equipped with window glass filters and operated in accordance with Practices G and G Therefore, all references to the use of this practice must be accompanied by a report prepared in accordance with Section 9 that describes the specific operating conditions used. Refer to Practice G for detailed information on the caveats applicable to use of results obtained in accordance with this practice. Note 3—Additional information on sources of variability and on strategies for addressing variability in the design, execution and data analysis of laboratory accelerated exposure tests is found in Guide G Significant factors include regulation of line voltage, temperature and humidity control, and condition and age of the lamps and filters. It is recommended that at least three replicates of each material be exposed to allow for statistical evaluation of results.

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ASTM D4459 test now offered at Micom Laboratories

This method details an accelerated weathering test which assesses the stability of plastics that are intended for indoor applications. Indeed, this standard relies on a periodical evaluation of the color difference between the file and exposed samples and on the use of a window glass filtered Xenon arc lamp in order appraise the behavior of the specimen in regard to the solar radiation that is going through a window. ASTM D test The purpose of the ASTM D standard is to determine the magnitude and the direction of the color difference between the file and exposed samples as a function of the time of exposure or of the radiant exposure. By assessing this characteristic, it is possible to foresee the performance of the plastic that is intended for an interior application through the use of an accelerating factor. The latter is material dependent and is obtained through a statistical study of the data gathered from past exposures. In order to achieve this purpose, this test relies on an accelerated weathering test which simulates an indoor exposure through a window, with a Xenon arc lamp as an illuminating source, and on a periodical assessment of the properties of the sample. As outlined in our UV testing eBook , an exposure to a Xenon arc light is mainly employed to evaluate the aesthetics of the specimen, because its light spectrum faithfully represents the whole solar spectrum.

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ASTM D4459测试标准

Douzshura Standards can be obtained from appropriate standard authorities. It is recommended that at least three replicates of each material be exposed to allow for statistical evaluation of results. Link to Active This link will always route to the current Active version of the standard. Testing Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards. Note 3 — Additional information on sources of variability and on strategies for addressing variability in the design, execution and data analysis of laboratory accelerated exposure tests is found in Guide G Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

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