ASTM G Standard Practice for Operating Xenon Arc Light Apparatus for Exposure of Non-Metallic Materials. ASTM G Standard Practice for Operating Xenon Arc. Light Apparatus for UV Exposure of Nonmetallic Materials. View on Information Provider website. Engaged Expert Terry Candlish discusses ASTM G and G tests which are used to evaluate sunlight and moisture exposure. ASTM.
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The length of dark period is not speci? See Practice D for detailed guidance. Such outcomes cannot be quickly obtained in outdoor settings; therefore, these weatherization tests are invaluable in timely product development. If the aim of testing is to boost color fastness, UV-A bulbs are ideal. However, g15 is no simple equation for calculating exposure.
Alternatively, the exposure may simulate the effects of sunlight through window glass. E Previous versions of this standard used window glass?
Typically, this is done at 2 nm increments.
When rays of sunlight—particularly UV rays—bombard a surface, they degrade smaller pigment particles, changing the surface color and creating a chalky effect. Because xenon arc light is most similar to natural sunlight, we generally use the ASTM G test for outdoor weatherization testing. In addition to distillation, a combination of deionization and reverse osmosis can effectively produce water of the required quality.
It may be tempting to assume that shorter wavelengths, continuous adtm, high temperatures, and other variables can result in more intense acceleration. The pH of the water used should be reported.
ASTM G and G Explained | Element
Contact the manufacturer of the xenon-arc devices for speci? Summary of Practice 4. The design of the experiment used to determine the speci? Therefore, no reference shall be made to results from the use of this practice unless accompanied by a report detailing the speci? These conditions are provided for reference only see Table X3. Overall, this test involves 21 days of exposure.
The apparatus described in Practice Awtm 26 iscovered by this practice. F For the benchmark solar spectrum, the UV irradiance to nm is 9. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
In the ASTM G test, xenon arc lamps simulate full-spectrum aetm within a controlled test chamber. Cycle 8 has been used for automotive interior components. Costs for weatherization testing will vary according to a number of factors, including moisturization, sample size, number of cycles, and more.
ASTM G154 and G155 Explained
The percentages of UV and visible irradiances on samples exposed in xenon arc devices with window glass? Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Test results can be expected to differ between exposures using xenon arc devices in which the spectral power distributions differ by as much as that allowed by the tolerances.
This is because test specimens having varying colors and thicknesses may be expected to vary in temperature. xstm
NOTE 3—Evaluation of color and appearance changes of exposed materials must be made based on comparisons to unexposed specimens of the same material which have been stored in the dark. Every location on asmt globe has its own unique combination of damaging elements, such as pollution, salt spray, and biological attack. Following are some representative exposure conditions. Thermometers shall conform to the descriptions found in Practice G