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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Cycle 7 has been used for thermal shock and for erosion testing of coatings for wood. In tests using the same cycles and temperatures, shorter times to failure are typically observed when the lamp with g154-1 UV irradiance is used. Sstm apparatus described in Practice G53 is covered by this practice. Include a control, to act as a weatherization standard. Cycles 3 and 4 have been used for exterior automotive materials. See ISO for detailed guidance.
Accelerated Weathering (QUV) ASTM G154, ASTM D4329, ASTM D4587, ISO 4892
Asgm The data in Table 3 are based on the rectangular integration of 44 spectral power distributions for? Following are some representative exposure conditions. 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. D The window glass? Precision and Bias Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards.
ASTM G and G Explained | Element
The lamps shown in this section are representative of their type. Due to time constraints, however, many producers employ the G and G laboratory chamber tests for reliable exposure results in shorter time periods.
Frequently, the irradiance is not controlled in this type of exposure device.
Cycle 5 has been used for roo? Test results can be expected to differ between exposures using devices with? 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.
Prior to exposing the specimens, quantify the appropriate properties in accordance with recognized ASTM or international standards. This data is provided for comparison purposes only.
Test results can be expected to differ between exposures using? These exposures may include a means to introduce moisture to the test specimen.
Therefore, no reference shall be made to results from the use of this practice unless accompanied by a report detailing the speci? Send us a request Wilton UK: The shorter, more damaging UVB wavelengths are the most greatly affected.
See Appendix X3 for more information comparing the solar radiation data used in the standard with that for CIE 85 Table 4. Apparatus operated in ambient temperatures above or below this range may produce irradiances different from devices operated in the recommended manner. To assure uniform exposure conditions,? 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.
Global Reach Intertek is the industry leader with over 42, people in 1, locations in over countries. Accelerated weathering provides exposed samples for comparison to unexposed control samples. Other integration techniques can be used to evaluate spectral power distribution data, but may give different results.
Active view current version of standard Translated Standard: Contact the manufacturer of the? The manufacturer is responsible for determining conformance to Table 1.
Current edition approved Dec. Maintain these conditions throughout the exposure. It is impossible to recreate nature in the lab. The control specimens shall be exposed simultaneously with the test specimen s in the same device. These cycles would be continued for extended periods of time – up to thousands of hours – simulating even longer periods of time in the real world. Therefore, these bulbs are useful for testing interior applications. Consequently, the use of a radiometer to monitor and control the radiant energy is recommended.
The pH of the water used should be reported.
Generally, degradation processes accelerate with increasing temperature. Thermometers shall conform to the descriptions found in Practice G This practice is limited to the procedures for obtaining, measuring, and controlling conditions of exposure. The un-insulated thermometers may be made of either steel or aluminum.
D The benchmark solar radiation data is de? Accelerated weathering simulates damaging effects of long term outdoor exposure of materials and coatings.