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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In xenon arc testing, different optical filters may be applied to shift testing conditions for daylight, window glass, or extended UV spectrum exposure. Use of this lamp is not recommended for sunlight simulation. A detailed description of the type s of lamp s used shall be stated in detail in the test report.
A detailed description of the type s of lamp s used should be stated in detail in the test report. Differences in lamp energy or spectrum may cause signi? If required for example, destructive testinguse unexposed? Note—A footnote was added to Table X2. NOTE 1—Practice G describes performance criteria for all exposure devices that use laboratory light sources.
The manufacturer is responsible for determining conformance to Table 1. In round-robin studies conducted by Subcommittee G When comparing relative spectral power distribution data to the spectral power distribution requirements of this standard, use the rectangular integration technique.
D The benchmark solar radiation data is de? Test results can be expected to differ between exposures conducted in? Link to Active This link will always route to the current Active version of the standard.
A number in parentheses indicates the year of last reapproval. The un-insulated thermometers may be made of either steel or aluminum.
Expose replicates of the test specimen and the control specimen so that statistically signi? Manufacturers of equipment claiming conformance to this standard shall determine conformance to the spectral power distribution tables for all?
A superscript epsilon e adtm an editorial change since the last revision or reapproval. Practice G axtm indicated that a cycle of 8 hours UV and 4 hours condensation is widely used.
Every location on the globe has its own unique combination of damaging elements, such as pollution, salt spray, and biological attack.
Practice Atm describes general procedures to be used when exposing nonmetallic materials in accelerated test devices that use laboratory light sources. Weatherometers used in the G and G tests approximate performance via intense exposure to the damaging elements in sunlight.
For instance, a slight shift in formula may produce twice as much resistance to weathering. For determining conformance to the relative spectral irradiance requirements for a? While this data is provided for comparison purposes only, it is desirable for the laboratory accelerated light source to provide a spectrum that is a close match to the benchmark solar spectrum.
This standard does not purport to address all of the safety concerns, if any, associated with its use. Because the primary emission of? Element provides both types of tests at our ISO accredited testing laboratories.
ASTM G154 and G155 Explained
It may be tempting to assume that shorter wavelengths, continuous exposure, high temperatures, and other variables can result in more intense acceleration. Cycle 5 has been used for roo? Test results can be expected to differ between exposures using devices with? The UVA is used for these applications because the low end cut-on of this lamp is similar to that of direct sunlight which has been? Cycles 3 and 4 have been used for exterior automotive materials.
Typically, water vapor shall be generated by heating water and? Tests using UVA lamps have g1154-06 found useful for comparing different nonmetallic materials such as polymers, textiles, and UV stabilizers. Misleading results may be obtained by this method, since the masked portion of the specimen is still exposed to temperature and humidity that in many cases satm affect results. Interruptions to service astk apparatus and to inspect specimens shall be minimized.
ASTM G and G Explained | Element
Remember, these accelerated weatherization tests cannot exactly reproduce outdoor conditions, as they cannot account g154-006 altitude, seasonal variations, local geographical features, and other variables. The minimum and asrm data are at least the three sigma limits from the mean for all measurements. Following are some representative exposure conditions. It is recommended that at least three replicates of each material evaluated be exposed in each test to allow for statistical evaluation of results.
NOTE 3—Do not mix different types of lamps.
In addition to distillation, a combination of deionization and reverse osmosis can effectively produce water of the required quality. Ordinary glass is essentially transparent to light above about nm. Aging of glass can result in a signi?
Different types of fluorescent UV lamp sources are described. See Practice G for detailed water quality instructions.
Masking or shielding the face of test specimens with an opaque cover for the purpose of showing the effects of exposure on one panel is not recommended.