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.
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Note 1 — Practice G describes performance criteria for all exposure devices that use laboratory light sources.
ASTM G154 and G155 Explained
Annex A1 states how to determine relative spectral irradiance. If required for example, destructive testinguse unexposed? Contact the manufacturer of the xenon-arc devices for speci? For any individual xenon-lamp with window glass?
The type of thermometer used, the method of mounting on specimen holder, and the exposure temperature shall be stated in the test report. Historical convention has established Cycle 1 as a very commonly used exposure cycle. Expose replicates of the test specimen and the control specimen so that statistically signi?
Cycle 8 corresponds to the test cycles awtm In round-robin studies conducted by Subcommittee G In order for xenon arcs to simulate terrestrial daylight,? The glass transmission is the average for a series of single strength window glasses tested as part of a research study for ASTM Subcommittee G3. Care should be taken to keep silica levels below 0. The percentages of UV asstm visible irradiances on samples exposed in xenon arc devices with window glass?
To assure uniform exposure asstm The minimum and maximum data are at least the three sigma limits from the mean for all measurements. When reproducibility in 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? This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
aetm Following are some representative exposure conditions. The manufacturer is responsible for determining conformance to Table 1. These conditions are provided for reference only see Table X3. This practice is limited to the procedures for obtaining, measuring, and controlling conditions of exposure. E Previous versions of this standard used window glass? Summary of Practice 4. More specific information about methods for determining the change in properties after exposure and reporting these results is described in Practice D In contrast, UV-A bulbs have a propensity for accelerating color fading and yellowing.
Typically, these exposures would include moisture in the form of humidity. Refer to Practice G for full cautionary guidance applicable to all laboratory weathering devices. Rotation of the holder g15 its axis alternately exposes each specimen to awtm radiation from the xenon burner. Overall, this test involves 21 days of exposure. Hemispherical on 37 degree Tilted Surface. Referenced Documents purchase separately The documents listed below asym referenced within the subject standard but are not provided as part of the standard.
No other units of measurement are included in this standard.
Different size lamps operating in different wattage ranges may be utilized in different sizes and types of apparatus. These exposures may include a means to introduce moisture to the test specimen. Interruptions to service the apparatus and to inspect specimens shall be minimized. In xenon arc testing, different optical filters may be applied to shift testing conditions for daylight, window glass, or extended UV spectrum exposure.
Recreate specialized conditions with filters. Typically, these exposures would include moisture in the form of humidity. Misleading results may be obtained by this method, since the masked portion of the specimen is still exposed to temperature and humidity that in many cases will affect results. Therefore, no reference shall be made to results from the use of this practice unless accompanied by a report detailing the speci?