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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Comparisons between materials are best made when they are tested astm g151 the same time in the same exposure device.
In astm g151 cases, the results for the test material are compared to those for the reference material. Results from accelerated exposure tests conducted according to this standard are best used to compare the relative astm g151 of materials.
Comparisons between materials are best made when they are tested at the same time in the same exposure device. Hemispherical on 37 Tilted Surface.
Note 4—If use of an acceleration factor is desired in spite of atm 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 astm g151 failure in each exposure can be analyzed using statistical methods.
Information regarding the reporting of results from exposure testing of plastic materials is described in Practice D These acceleration factors are not astm g151 for several reasons. In some applications, asym reference materials are used to 1g51 consistency of the operating conditions in an exposure test. Exposure conditions astm g151 do not have any temperature cycling or that produce temperature cycling, or thermal shock, or both, that is not representative of astm g151 conditions.
Exposure conditions that astm g151 not have any temperature cycling or that produce temperature cycling, or thermal shock, or both, 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 1. Note 2-Guide G provides information for addressing variability in astm g151 testing of nonmetallic materials.
Results obtained astm g151 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. 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, astm g151 G respectively.
Detailed information regarding procedures to astm g151 used for specific devices are found in standards describing g511 particular device being used.
Related Suppliers Searching for related suppliers These are inappropriate uses of reference materials when they are not sensitive to exposure stresses that produce failure in the test material or when the reference material is very sensitive to an exposure astm g151 that has very little effect on the test material. When conducting exposures in devices that astm g151 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 environm Results can be expressed by comparing the exposure time or radiant astm g151 necessary to change a characteristic property to some specified level.
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ASTM G – UV EXPOSURE (GENERAL)
astm g151 Link to Active This link will always route to the current Active version of the standard. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Note 1—Carbon-arc, xenon arc, and fluorescent UV exposures were also described in Practices, and which referred to very specific equipment designs. Guide G provides information for application of statistics to exposure test results Note 3—This standard is technically equivalent to ISOPart 1. Reference materials, for example, blue wool test fabric, also may be used for the purpose of timing exposures.
It is the responsibility of the user of this standard to establish appropriate astm g151 and health practices and astm g151 the applicability of regulatory limitations prior to use.
No laboratory exposure test can be specified as a total simulation astm g151 actual use conditions in outdoor environments. Differences in the spectral distribution between the laboratory light source and solar radiation.
When conducting exposures in devices that use laboratory light sources, it is important to consider how well the accelerated astm g151 conditions will reproduce property changes and failure modes associated with astm g151 environments for the materials being tested.
No laboratory astm g151 test can be specified as a total simulation of actual use conditions in outdoor environments. 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, g1511, and other factors.
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 astm g151 each property.
ASTM Committee G3 is developing a standard guide for application of statistics to exposure test results. In addition, it astm g151 essential to consider the effects of variability in both the accelerated test and outdoor astm g151 when setting up exposure experiments and when interpreting the results from accelerated exposure tests.
For example, detailed information covering exposures in devices that use carbon-arc, xenon-arc, and fluorescent UV light sources are found in Practices G, G, and G, and G respectively.