Engaged Expert Terry Candlish discusses ASTM G and G tests which are used to evaluate sunlight and moisture exposure. ASTM. ASTM G & G UV Testing. The UV testing was performed on ecomère by Touchstone Labs in Tridelphia, WV, again at the request of Southern . ASTM G – Designation: G – 06 Standard Practice for Operating Fluorescent Light Appara.
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A detailed description of the type s of lamp s used shall be stated in detail in the test report. As such, the ASTM G and G tests produce comparative, not absolute data, but these comparative evaluations can still prove extremely valuable to designers. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
This short wavelength UV can produce rapid polymer degradation and often causes degradation ashm mechanisms that do not occur when materials are exposed to sunlight.
See ISO for detailed guidance. This practice is limited to the procedures for obtaining, measuring, and controlling conditions of exposure.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Our team g14-06 that florescent light has lower correlation to sunlight than xenon arc light; therefore, we generally recommend using the ASTM G fluorescent test to test for interior exposure i.
This data is provided for comparison purposes only. Practice G describes general procedures to be used when exposing nonmetallic materials in accelerated test devices that use laboratory light f154-06. Make an inquiry today. This standard does not purport to address all of the safety concerns, if any, associated satm its use.
This practice is intended to reproduce the weathering effects that occur when materials are exposed to sunlight either direct or through window glass and moisture as rain or dew in actual usage. The repositioning schedule shall be agreed upon by all interested parties.
ASTM G154 and G155 Explained
Link to Active This link will always route to the current Active version of the standard. The particular application determines which lamp should be used. This sstm because the UVA has a special power distribution in the short wave UV region that is similar to sunlight that has already been?
If required for example, destructive testinguse unexposed? It is recommended that at least three replicates of each material evaluated be astmm in each test to allow for statistical evaluation of results.
Refer to Practice G for full cautionary guidance applicable to all laboratory weathering devices. The particular testing application determines which lamp should be used. The manufacturer is responsible for determining conformance to Table 3.
In contrast, UV-A bulbs have a propensity for accelerating color fading and yellowing. It is impossible to recreate nature in the lab.
Test results can be expected to differ between exposures using? Therefore, no reference shall be made to results from the use of this practice unless accompanied by a report detailing the specific operating conditions in conformance with Section Such outcomes cannot be quickly obtained in outdoor settings; therefore, these weatherization tests are invaluable in timely product development.
In ASTM G testing, UVA bulbs create the best correlation with outdoor exposure, as they have the closest wavelengths to damaging natural light from to nm. Very low levels of silica in spray water can cause signi? Exposures are not intended to simulate the deterioration caused by localized weather phenomena, such as atmospheric pollution, biological attack, and saltwater exposure.
However, for users of equipment made by another manufacturer, the irradiance control system did not have the measurement inaccuracies described above, so running at the new set points will represent a change in the actual irradiance of the test.
ASTM G and G Explained | Element
After inspection, the test specimen shall be returned to the test chamber with its test surface in the same orientation as previously tested. If in doubt, users should consult the manufacturer of their device for clari? A number in parentheses indicates the year of g1540-6 reapproval. For any individual UVB lamp, the calculated percentage in each bandpass must fall within the minimum and maximum limits of Table 3. In round-robin studies conducted by Subcommittee G G54-06 types of fluorescent UV light sources are described.
D The window glass?