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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Therefore, no reference shall be made to results from the use of this practice unless accompanied by a report detailing the speci? The default lamp for this and other cycles is the UVB lamps with peak emission at nm, but?
ASTM G154 and G155 Explained
Such outcomes cannot be quickly obtained in outdoor settings; therefore, these weatherization tests are invaluable in timely product development. This practice replaces Practice G 53, which describes very specific designs for devices used for fluorescent UV exposures. These exposures may include a means to introduce moisture to the test specimen.
There are two commonly available types of UVB lamps that meet the requirements of this document. Practice G describes general procedures to be used when exposing nonmetallic materials in g1540-6 test devices that use laboratory light sources.
No other units of measurement are included in this standard. This is because the UVA has a special power distribution in the short wave UV region that is similar to sunlight that has already been?
Make an inquiry today. Active view current version of standard. Cycle 5 has been used for roo? Use of this equation requires that each spectral interval must be the same for example, 2 nm throughout the spectral region used.
ASTM G and G Explained | Element
F For the benchmark daylight spectrum, the UV irradiance to nm is 9. B The data in Table 1 are based on the rectangular integration of 65 spectral power distributions for? These are not necessarily preferred and no recommendation is implied. 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.
These conditions are provided for reference only. If a radiometer is used, it shall comply with the requirements in Practice G 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?
Overall, this test involves 21 days of exposure.
Moisture takes its own toll on surfaces, and the combination of sunlight and moisture can amplify damage, costing millions of dollars of depreciation each year.
Without testing asm a specific location over a number of years, it is impossible to perfectly predict product response. 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. The apparatus described in Practice Axtm 53 is covered by this practice. When rays of sunlight—particularly UV rays—bombard a surface, they degrade smaller pigment particles, changing the surface color and creating a g15-406 effect.
ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
If the aim of testing is to boost color fastness, UV-A bulbs are ideal. Atsm G describes performance criteria for all exposure devices that use laboratory light sources. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
Frequently, the irradiance is not controlled in this type of exposure device. Typically, this is done at 2 nm increments. However, each of these variables brings uniquely inaccurate results. Precision and Bias If in doubt, users should consult g15-406 manufacturer of their device for clari?
Cycle 6 has been used for high irradiance exposures of coatings and plastics. 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. A detailed description of the type s of lamp s used should be stated in detail in the test report. Cracking, peeling, de-glossing, oxidation, and tensile weakening are additional outcomes of exposure; sometimes such deterioration can even occur through window glass.
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.
Our team understands 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.
Typically, water vapor shall be generated by heating water and?
A asm description of the type s of lamp s used shall be stated in detail in the test report. Different UV bulbs are useful for different testing purposes.
These conditions are provided for reference only See Table X2.