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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Active view current version of standard Translated Standard: These numbers represent the characteristic nominal wavelength in nm of peak emission for each of these lamp types.
ASTM Ga 非金属材料的萤光UV灯曝晒_百度文库
As a adtm guide, hours under UV-B bulbs is equivalent to 1 year of exposure in South Florida, while hours under UV-A bulbs can create the same exposure effects. 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. Aging of glass can result in a signi? Tests using UVA lamps have been g154-122 useful for comparing different nonmetallic materials such as polymers, textiles, and UV stabilizers.
Accelerated Weathering (QUV) ASTM G154, ASTM D4329, ASTM D4587, ISO 4892
It is impossible to recreate nature in the lab. Without testing in a specific location over a number of years, it is impossible to perfectly predict product response. E Previous versions of this standard used window glass?
See Practice G for detailed water quality instructions. Frequently, the irradiance is not controlled in this type of exposure device.
Atsm results can be expected to differ between exposures conducted in? UV-B light accelerates the brittleness that materials, particularly polymers, may suffer as they age indoors. This practice replaces Practice G53, which describes very speci?
If a radiometer is used, it shall comply with the requirements in Practice G 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 Enabling you to identify and mitigate the intrinsic risk in your operations, supply chains and business processes. See ISO for detailed guidance. As a result of? See Practice G for further guidance.
When reproducibility sstm results from an exposure test conducted according to this practice have not been established through round-robin testing, performance requirements for materials shall be speci? Assurance Testing Inspection Certification. Recreate specialized conditions with filters.
This data is provided for comparison purposes only.
ASTM G and G Explained | Element
A detailed description of the type s of lamp s used should be stated in detail in the test report. Exposures are not intended to simulate the deterioration caused by localized asm phenomena, such as atmospheric pollution, biological attack, and saltwater exposure.
A number of exposure procedures are listed in an appendix; however, this practice does 1g54-12 specify the exposure conditions best suited for the material to be tested. Active view current version of standard. The particular application determines which lamp should t154-12 used. 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.
Validating the specifications, value and safety of your raw materials, products and assets. These conditions are provided for reference only See Table X2.
Element provides both types of tests at our ISO accredited testing laboratories. Last previous edition approved in as G — 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. Test results can be expected to differ between exposures using? Overall, this test involves 21 days of exposure. Irradiance uniformity shall be determined in accordance with Practice G Remember, these accelerated weatherization tests cannot exactly reproduce outdoor conditions, as they cannot account for altitude, seasonal variations, local geographical features, and other variables.
Cycle 2 has been widely used for coatings. Therefore, there is a minimal difference between the temperature of an insulated or uninsulated black or white panel thermometer, specimen surface, air in the test chamber, or different colored samples 3. This practice is limited to the procedures for obtaining, measuring, and controlling conditions of exposure.
ASTM G154 and G155 Explained
Furthermore, tests using the same cycles and temperatures with these two lamps may exhibit differences in ranking of materials due to difference in the proportion of UV to moisture and temperature. Element has been helping companies make Certain for over years.
F For the benchmark solar spectrum, the UV irradiance to nm is 9. These are not necessarily preferred and no recommendation is implied.
Therefore, these bulbs are useful for testing interior applications. Certification Formally confirming that your products and services meet all trusted external and internal standards. 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.
Hemispherical on 37 Tilted Surface. The total irradiance in each wavelength bandpass is then summed and divided by the speci? Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.