ASTM G – 00 Standard Practice for Exposing Nonmetallic. Materials in Accelerated Test Devices that Use Laboratory. Light Sources. View on Information. ASTM G UV EXPOSURE (GENERAL). This practice provides general procedures to be used when exposing nonmetallic materials in accelerated test. 21 Jun ASTM G – Designation: G – 09 Standard Practice for Exposing Nonmetallic Materials in Ac.
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Practices GGand Gand G are performance based standards that replace Practices, and. Results can be expressed by comparing the exposure time or radiant exposure necessary to change a characteristic property to some specified level. In some cases, the results for the test material are compared to those for the reference material.
Link to Active This link will always route to the current Active version of the standard. Therefore, even if results from a specific exposure test conducted according to this practice are found to be useful for comparing the relative durability of materials exposed in a particular exterior environment, it cannot be assumed that they will be useful for determining relative durability of the same materials for a different environment.
Acceleration factors are material dependent and can be significantly different for each material and for different formulations of the same material. Specific information about methods for determining the property of a nonmetallic material before and after exposure are found in standards describing the method used to measure each property.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Test conditions where specimens are exposed continuously to light when actual use conditions provide alternate periods of light and dark. In some applications, weathering reference materials are used to establish consistency of the operating conditions in an exposure test.
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Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Note 6—Practice G describes procedures for selecting and characterizing weathering reference materials used to establish consistency of operating conditions in a laboratory accelerated astk.
Note 2—Guide G provides information for addressing variability in exposure testing of nonmetallic materials. The relative durability of materials in actual use conditions can be very different in different locations because of differences in UV radiation, time of wetness, relative humidity, temperature, pollutants, and other factors.
Work Item s – proposed revisions of this standard. aetm
Information regarding the reporting of results from exposure testing of plastic materials is described in Practice D There are a number of factors that may decrease the degree of correlation between accelerated tests using laboratory light sources and exterior exposures.
In some cases, a reference material is exposed at the same time as a test material and the exposure is conducted until there is a defined change in property of the reference material. No laboratory exposure test can be specified as a total simulation of actual use conditions in outdoor environments. Note Carbon-arc, xenono-arc, and fluorescent UV exposures are also described in Practices G23, G26, and G53 which described very specific equipment designs. Detailed information regarding procedures to be used for specific devices are found in standards describing the particular device being used.
Comparisons between materials are best made when they are tested at the same time in the same exposure device.
Historical Version s – view previous versions of standard. Detailed information regarding procedures to be used for specific devices are found in standards describing the particular device being used. This information is intended primarily for producers of laboratory accelerated exposure devices. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of asm limitations prior to use.
Information regarding the reporting of results from exposure testing of plastic materials is described in Practice D Acceleration factors calculated based on asym ratio of irradiance between a laboratory light source and solar radiation, even when identical bandpasses are used, do not take into consideration the effects on a material of irradiance, temperature, moisture, and differences in spectral power distribution between the laboratory light source and solar radiation.
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Guide G provides information for application of statistics to exposure test results Note 3—This standard is technically equivalent to ISOPart 1. For example, detailed information covering exposures in devices that use open flame carbon arc, enclosed carbon arc, xenon arc and fluorescent UV light source are found in Practices GGGand G respectively. These acceleration factors are not valid for several reasons. Asrm addition, it is essential to consider the effects of variability in both the accelerated test and outdoor exposures when astn up exposure experiments and when interpreting the results from accelerated exposure tests.
Note 1—Carbon-arc, xenon arc, and fluorescent Ast exposures were also described in Practices, and which referred to very specific equipment designs.
Specific information about methods for determining the property of a nonmetallic material before and after exposure are found in standards describing the method used to measure each property. Reproducibility of test results between laboratories has been shown to be good when the stability of materials is evaluated in terms of performance ranking compared to other materials or to a control;therefore, exposure of a similar material of known performance a control at the same time as the test materials is strongly recommended.
More specific information on how each factor may alter stability ranking of materials is given in Appendix X1.