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.
|Published (Last):||11 May 2017|
|PDF File Size:||1.59 Mb|
|ePub File Size:||2.31 Mb|
|Price:||Free* [*Free Regsitration Required]|
Without testing in a specific location over a number of years, it is impossible to perfectly predict product response.
Care should be taken to keep silica levels below 0. As such, the ASTM G awtm G tests produce comparative, not absolute data, but these comparative evaluations can still prove extremely valuable to designers. See Appendix X4 for more information comparing the solar radiation data used in the standard with that for CIE 85 Table 4.
Control samples and multiple material samples produce the best comparative data. A superscript epsilon e indicates an editorial change since the last ast or reapproval. When rays of sunlight—particularly UV rays—bombard a surface, they degrade smaller pigment particles, changing the surface color and creating a chalky effect. Due to time constraints, however, many producers employ asttm G and G laboratory chamber tests for reliable exposure results in shorter time periods.
Use of this equation requires that each spectral interval must zstm the same for example, 2 nm throughout the spectral region used. This practice is limited to the procedures for obtaining, measuring, and controlling conditions of exposure. 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 2 — Caution: See Appendix X4 for more information comparing the solar radiation data used in this standard with that for CIE 85 Table 4.
For any individual xenon-lamp with window glass? This allows for accurate comparison. Annex A1 states how to determine relative spectral irradiance.
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. Element provides both types of tests at our ISO accredited testing laboratories.
Alternatively, the exposure may simulate the effects of sunlight b155 window glass. Rotation g515 the holder on its axis alternately exposes each specimen to direct radiation from the xenon burner. Every location on the globe has its own unique combination of damaging elements, such as pollution, salt spray, and biological attack.
Xenon Arc Testing Weatherometers used in the G and G tests approximate performance via intense exposure to the damaging elements in sunlight. Suggested minimum irradiance is 0. Your comments are invited either for revision of this asgm or for additional standards and should be addressed to ASTM International Headquarters.
The spectral irradiance for a xenon arc with extended UV? D The benchmark solar radiation data is de? Exposures are not intended to simulate the deterioration caused by localized weather phenomena, such as atmospheric pollution, biological attack, and saltwater exposure.
ASTM G154 and G155 Explained
Cycle 4 has been used for indoor plastics. 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. We can work with you to ascertain the most cost-effective, accurate testing approach for your material.
Therefore, these bulbs are useful for testing interior applications. Because xenon arc light is most similar to natural sunlight, we generally use the ASTM G test for outdoor weatherization testing.
Interruptions to service the apparatus and to inspect specimens shall be minimized. Consult the applicable test method or material speci? In order for xenon arcs to simulate terrestrial daylight,?
The spectral power distribution data is for? astmm
ASTM G and G Explained | Element
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 who would normally conduct the exposure and property measurement.
However, each of these variables brings uniquely inaccurate results. For any individual xenon-arc lamp with extended UV? See Practice G for further guidance.