ASTM G151 PDF

Significance and Use 4. In addition, it is essential to consider the effects of variability in both the accelerated test and outdoor exposures when setting up exposure experiments and when interpreting the results from accelerated exposure tests. 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. 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. 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.

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Detailed information regarding procedures to be used for specific devices are found in standards describing the particular device being used. 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 , G , G , and G respectively. Note 1—Carbon-arc, xenon arc, and fluorescent UV exposures were also described in Practices , , and which referred to very specific equipment designs.

Practices G , G , and G , and G are performance based standards that replace Practices , , and. This information is intended primarily for producers of laboratory accelerated exposure devices.

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. Information regarding the reporting of results from exposure testing of plastic materials is described in Practice D Note 2—Guide G provides information for addressing variability in exposure testing of nonmetallic materials.

Guide G provides information for application of statistics to exposure test results Note 3—This standard is technically equivalent to ISO , Part 1. 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.

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ASTM G151 PDF DOWNLOAD

Detailed information regarding procedures to be used for specific devices are found in standards describing the particular device being used. 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 , G , G , and G respectively. Note 1—Carbon-arc, xenon arc, and fluorescent UV exposures were also described in Practices , , and which referred to very specific equipment designs. Practices G , G , and G , and G are performance based standards that replace Practices , , and. This information is intended primarily for producers of laboratory accelerated exposure devices.

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Arashigul It is the responsibility of the astm g of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Exposure conditions that do not have any temperature cycling or that produce temperature cycling, or astm g shock, or both, that is not representative of use conditions. More specific information on how each factor may alter stability ranking of materials is given in Appendix X1. Guide G provides information for application of astm g to exposure astm g results Note 3-This standard is technically equivalent to ISOPart 1. Comparisons between materials are best made g15 they are tested at the same time in the same exposure device. ASTM International 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. Note 5—Definitions for control and reference material that are appropriate to weathering tests are astm g in Terminology G Note 4-If use of an acceleration factor is desired in spite of the warnings given in this practice, such acceleration factors for a particular material 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 analyzed using statistical methods.

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