ASTM G154-06 PDF
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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This practice axtm 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. Overall, this test involves 21 days of exposure. ASTM International recommends that a comparable material of identified performance a control be exposed at the same time as the test specimen.
Practice G describes general procedures to be used when exposing nonmetallic materials in atm test devices that use laboratory light sources. Practice G describes performance criteria for all exposure devices that use laboratory light sources.
ASTM G and G Explained | Element
In xenon arc testing, different optical filters may be applied to shift testing conditions for daylight, window glass, or extended UV spectrum exposure.
A number of exposure procedures are listed in an appendix; however, this practice does not specify the exposure conditions best suited for the material to be tested. The apparatus described in Practice G 53 is covered by this practice. F For the benchmark window glass? 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.
Every location on the globe has its own unique combination of damaging elements, such as pollution, salt spray, and biological attack.
Generally, two controls are recommended: This short wavelength UV can produce rapid polymer degradation and often causes degradation by mechanisms that do not occur when materials are exposed to sunlight.
A number of exposure procedures are listed in an appendix; however, this practice does not specify the exposure conditions best suited for the material to be tested.
ASTM G154 and G155 Explained
SPDs for sunlight were measured in Phoenix, AZ at solar noon at the summer solstice with a clear sky, with the spectroradiometer on an equatorial follow-the-sum mount. The total irradiance in each wavelength bandpass is then g154–06 and divided by the speci? These conditions are provided for reference only. Therefore, g154-60 reference shall be made to results from the use of this practice unless accompanied by aztm report detailing the specific operating conditions in conformance with Section Consequently, in testers without feed-back-loop control of irradiance, the lamp output will decrease with increasing chamber temperature.
The round-robin shall be conducted according to Practice E or Practice D and shall include a statistically representative sample of all laboratories or organizations that would normally conduct the exposure and property measurement.
Different types of fluorescent UV light sources are described. Cycle 2 has been widely used for coatings. When required, provision shall be made for the spraying of water on the test specimen for the formation of condensate on the exposed face of the specimen or for the astmm of the test specimen in water.
A superscript epsilon e indicates an editorial change since the last revision or reapproval. Note 1 Practice G describes performance criteria for all exposure devices that use laboratory light sources.
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. The manufacturer is responsible for determining conformance to Table 3.
A detailed description atsm the type s of lamp s used should be stated in detail in the test report. Element can provide you with critically important data on your product or part’s performance in response to typical or extreme environmental stresses and conditions.
Xenon Arc Testing Weatherometers used in the G and G tests approximate performance via intense exposure to the damaging elements in sunlight. However, each of these variables brings uniquely inaccurate results.
Users of astj standard are expressly advised that determination of the validity of any such patent rights, and the risk of ashm of such rights, are entirely their own responsibility. This is because the UVA has a special power distribution in the short wave UV region that is similar to sunlight that has f154-06 been? Originally approved in Typically, these exposures would include moisture in the form of condensing humidity. Typically, water vapor shall be generated by heating water and?
Alternatively, the exposure may simulate the effects of sunlight through window glass. If in doubt, users should consult the manufacturer of their device for clari? Test results can be expected to differ between exposures using devices with? Hemispherical on 37 degree Tilted Surface.
The particular testing application determines which lamp should be used.