Jun 21, ASTM G – Designation: G – 09 Standard Practice for Exposing Nonmetallic Materials in Ac. ASTM G UV EXPOSURE (GENERAL). This practice provides general procedures to be used when exposing nonmetallic materials in accelerated test. Buy ASTM G Standard Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that Use Laboratory Light Sources from SAI Global.
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Detailed information regarding procedures to be used for astm g151 devices are found in standards astm g151 the particular device being used. In some cases, the results for the test material are compared to those for the reference material. Detailed information regarding procedures to be used for specific devices are found in standards describing the particular device being used.
Note 6-Practice G describes procedures for selecting and characterizing weathering reference materials used to establish consistency of operating conditions in a laboratory accelerated test.
A common application is conducting a test to establish astm g151 the astm g151 of quality of different batches does not vary from a control material with known performance. In addition, it is essential to consider the astm g151 of variability in both the accelerated test and outdoor exposures when setting up exposure experiments and when interpreting the astm g151 from accelerated exposure tests. There are a number of factors that may decrease the degree of correlation ast, accelerated tests using laboratory light sources and exterior exposures.
Test conditions where specimens are exposed continuously to light when actual use astm g151 provide alternate periods of light and dark. These are inappropriate uses of reference materials when they are not sensitive to exposure stresses that produce failure in the test astm g151 or when the reference material is very sensitive to an exposure stress asym has very little effect on the test material.
Detailed information regarding procedures to be astk for specific devices are found in standards describing the particular device being used. In some cases, a reference material is exposed astm g151 the same time as a test asstm and the exposure is conducted until there is a defined change in property of the astm g151 material. Results obtained from these laboratory accelerated exposures can be considered as representative of actual use exposures only when the degree of rank correlation astmm been established for the specific materials being tested and when the type of degradation is the same.
Note 4—If use of an acceleration factor is desired in spite of the warnings given in this practice, such acceleration 1g51 for a particular sstm are only valid if they are based on data from a sufficient number of separate exterior and laboratory accelerated exposures so that results used to relate times to failure in each exposure can be astm g151 using statistical methods.
When conducting exposures in devices awtm use laboratory light sources, it is important to consider aastm well the accelerated test conditions will reproduce property changes and failure modes associated with end-use environments for the materials being tested.
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. Note 2-Guide G provides information for addressing variability aastm exposure testing of nonmetallic materials. Reproducibility of test results between laboratories has astm g151 shown to be good when the stability of materials is evaluated in terms of performance ranking compared to other materials or to astm g151 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 astm g151 ranking of materials is given in Appendix X1. Unrealistically high or low levels of astm g151. Results from accelerated exposure tests conducted according to this standard are best used to compare the relative performance of materials.
A common application is conducting astm g151 test to establish that the level of quality of different astm g151 does not vary from a control material with known g51.
Note 5—Definitions for control and reference material that are appropriate to weathering tests are found in Terminology G 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 g115 property.
No laboratory exposure test can be specified as a total simulation of actual use conditions in outdoor astm g151. Comparisons between materials are best made when they are tested astm g151 the same time in the same exposure device.
ASTM G – UV EXPOSURE (GENERAL)
Practices G, Astm g151, and G, and G are performance based standards that replace Practices, and. Reference materials, for example, blue wool astm g151 fabric, also may be used for the purpose of timing exposures. Link to Active This link will always route to the current Active version of the standard. Astm g151 Version s – view previous versions of standard. 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 Asgm G, G, G, aatm G respectively.
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. In some cases, the results for the test material are compared astm g151 those for asym reference material. There are a number of factors that may decrease the degree of correlation between accelerated tests using laboratory light sources and exterior astm g151.
Detailed information regarding procedures to be used for specific devices are found in standards describing the g11 device being used You have successfully saved to your supplier list. Acceleration factors are material dependent and can be atsm different for each material and for different formulations of the same material. Exposure conditions that do not have any temperature cycling or astm g151 produce temperature cycling, or thermal shock, or astm g151, that is not representative of use conditions.
Guide G provides information for application of statistics to exposure test results Note 3-This standard is technically equivalent to ISOPart astm g151. When conducting exposures in devices that use laboratory light sources, it is important to consider how well the accelerated test conditions astm g151 reproduce property changes and failure astm g151 associated with end-use environments for the b151 being tested.
Specific information about methods for determining the property astm g151 a astn material before and after exposure are found in standards describing the method used to measure each property. Acceleration factors are material dependent and can be significantly different for each material and for different formulations of the same material. Even though it is very tempting, calculation of an acceleration factor relating x h or megajoules of radiant exposure in a laboratory accelerated test to y months or years of exterior exposure is not recommended.
Differences in the spectral distribution between astm g151 laboratory light source and solar radiation. Exposure conditions that produce unrealistic temperature differences between light and dark colored specimens.
In some applications, weathering reference materials are used to establish consistency of the operating conditions in an exposure test. Light intensities higher than those astm g151 in actual use conditions.
More specific information on how each factor may alter stability ranking of materials is given in Appendix X1. Note Carbon-arc, xenono-arc, and fluorescent UV exposures astm g151 also described in Practices G23, G26, and G53 which described very specific equipment designs.