Designation: G? 12a Standard Practice for Operating Fluorescent Ultraviolet (UV) Lamp Apparatus for Exposure of Nonmetallic Materials1. ASTM CommiKee E44 intends to address these concerns by creaIng a standard on meeIng the ASTM G‐ Standard PracIce for. OperaIng Fluorescent. Engaged Expert Terry Candlish discusses ASTM G and G tests which are used to evaluate sunlight and moisture exposure. ASTM.
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Such outcomes cannot be quickly obtained in gg154-12 settings; therefore, these weatherization tests are invaluable in timely product development.
Annex A1 states how to determine relative spectral irradiance. Following are some representative exposure conditions. These numbers represent the characteristic nominal wavelength in nm of peak emission for each of these lamp types.
In the ASTM G test, xenon arc lamps simulate full-spectrum sunlight within a controlled test chamber. 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.
As such, the ASTM G and G tests produce comparative, not absolute data, but these comparative evaluations can still prove extremely valuable to designers. Assurance Testing Inspection Certification. 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.
NOTE 9—Typically, these devices control by black panel temperature only. Hemispherical on 37 Tilted Surface. B The data in Table asm are based on the rectangular integration of 44 spectral power distributions for?
Different UV bulbs are useful for different testing purposes. We can work with you to ascertain the most cost-effective, accurate testing approach for your material.
Note 1 — Practice G describes performance criteria for all exposure devices that use laboratory light sources. See ISO xstm detailed guidance. Overall, this test involves 21 days of exposure. The spectral power distribution data is for lamps within the aging recommendations of the device manufacturer. Precision and Bias Whether your business is local or global, we can ensure your products meet quality, health, environmental, safety, and social accountability standards for virtually any market around g154-1 world.
Accelerated Weathering (QUV) ASTM G154, ASTM D4329, ASTM D4587, ISO 4892
The manufacturer is responsible for determining conformance to Table 3. Other lamps, or combinations of lamps, may be used.
The control specimens shall be exposed simultaneously with the test specimen s in the same device. The particular testing application determines which lamp should be used. Cracking, peeling, de-glossing, oxidation, and tensile weakening are additional outcomes of exposure; sometimes such deterioration can even occur through window glass. Element provides both types of tests at our ISO accredited testing laboratories. The lowest asmt measured shall be no greater than nm.
Asrm Arc Testing Weatherometers used in the G and G tests approximate performance via intense exposure to the damaging elements in sunlight.
Accelerated Weathering (QUV) ASTM G, ASTM D, ASTM D, ISO
Because the primary emission of? Frequently, the irradiance is not controlled in this type of exposure device. As shown in Fig.
As a general guide, hours under UV-B bulbs is equivalent to 1 year of exposure in South Florida, while hours under UV-A bulbs can atsm the same exposure effects. These lamps emit different amounts of total energy, but both peak at nm and produce the same UV wavelengths in the same relative proportions. The un-insulated thermometers may be made of either steel or aluminum. Aging of glass can result in a signi? The apparatus described in Practice G53 is covered by this practice.
Ordinary glass is essentially transparent to light above about nm. 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? Costs for weatherization testing satm vary according to a number of factors, including moisturization, sample size, number of cycles, and more.
Test results can be expected to differ between exposures using? These are not necessarily preferred and no recommendation is implied.
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 immersion of the test specimen in water.
See Appendix X1 for lamp application guidelines.
ASTM G154 and G155 Explained
Originally approved in 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. Brass, steel, or copper shall not be used in the vicinity of the test specimens. Up to 20 test samples are mounted in the QUV and subjected to a cycle of exposure to intense ultraviolet radiation followed by moisture exposure by condensation.
Corrosion resistant alloys of aluminium or stainless steel have been found g154-21. Because xenon arc light is most similar to natural sunlight, we generally use the ASTM G test for outdoor weatherization testing.
Generally, degradation processes accelerate with increasing temperature. Weatherometers used in the G and G tests approximate performance via intense exposure to the damaging elements in sunlight.
Global Reach Intertek is the industry leader with over 42, people in 1, locations in over countries. Test results can be expected to differ between exposures conducted in? Permission rights to photocopy the standard may also be secured from the ASTM website www.