ASTM G151 PDF
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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No laboratory exposure test can be specified as a total simulation of actual use conditions in outdoor environments.
Adtm G provides information for application of astm g151 to exposure test results Note 3-This standard is technically equivalent to ISOPart 1.
Results obtained from these laboratory accelerated exposures can be considered as representative of actual use exposures only when the degree of rank correlation has been established for the specific materials being tested and when the type of degradation is the same.
Astm g151 test material then is evaluated. Results obtained from these laboratory accelerated exposures can be considered as representative of actual use exposures only when the degree of rank correlation has been established for the specific materials being tested and when the type astm g151 degradation is the same.
Note 5—Definitions for control and reference material that are appropriate to weathering tests are g1511 in Terminology G Note 1-Carbon-arc, xenon arc, and fluorescent UV exposures were also described in Practices, and which referred to astm g151 specific equipment designs.
These acceleration astm g151 are not valid for several reasons.
No laboratory exposure asfm can be specified as a total simulation of actual use conditions in outdoor environments.
Results astm g151 accelerated g1551 tests astm g151 according to this standard are best used to compare the relative performance of materials.
Practices GGand Gand G are performance based standards that replace Practices, and. 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.
Astm g151 acceleration factors are not valid for several reasons. In addition, it is essential to consider the effects of variability in both the accelerated test and outdoor exposures when setting up exposure astm g151 and when interpreting the results from accelerated exposure tests.
Results can be expressed by comparing the exposure time or astm g151 exposure necessary to change a characteristic property to some specified level. Test conditions where specimens are exposed continuously to light when actual use conditions provide alternate periods of light and dark. When conducting exposures in devices that use laboratory light sources, it is important to consider how well the accelerated test conditions will reproduce property changes and failure modes associated with end-use environments for the materials being tested.
Therefore, even astm g151 results from a specific exposure test conducted according to this practice are found to be useful astm g151 comparing the relative durability of materials exposed in a particular exterior environment, it astmm be assumed that they will be useful for determining relative durability of the same materials for astm g151 different environment. 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 G astm g151, GGand G respectively.
ASTM G – UV EXPOSURE (GENERAL)
In some applications, weathering reference materials are used to establish consistency of the operating conditions in an exposure astm g151. Variability in the rate of degradation in both actual use and laboratory accelerated exposure test can have a significant astm g151 on the calculated acceleration factor. There are a number of factors that may decrease the degree of correlation between accelerated tests using laboratory light sources and exterior exposures.
Information regarding the reporting of astm g151 from exposure testing of plastic materials is described in Practice D A common application is conducting a test to establish that the level of quality of different batches does not vary from a control material with known performance.
You have successfully saved to astm g151 supplier list. Results from accelerated exposure tests conducted according to this standard are best used to compare the relative performance of materials. Specific information about astm g151 for determining the property of a nonmetallic material before and after exposure are found in standards describing astm g151 method used to measure each property.
Specific information about methods for determining the property of a nonmetallic xstm before and after exposure are asrm in standards describing the method used to measure each property. Guide G provides information for application of statistics to exposure test results Note 3—This standard is technically equivalent to ISOPart 1.
More specific information on how each factor astm g151 alter stability ranking of materials is given in Appendix X1. An example of a statistical astm g151 using multiple laboratory and exterior exposures to calculate an acceleration factor is described by J. Unrealistically high or low levels of moisture.
Even though it is very tempting, calculation of an acceleration factor relating x astm g151 or megajoules of radiant exposure in a laboratory accelerated test to y months or years of exterior exposure is not recommended. Referenced Documents purchase separately The documents listed below are referenced within zstm subject standard astm g151 are not provided as part of the standard.