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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Variability in the rate of degradation in astm g151 actual use and laboratory accelerated exposure test can have a significant effect on the calculated acceleration factor. The relative durability of materials in actual use conditions can be very astm g151 in different locations because of differences in UV radiation, time of wetness, relative humidity, temperature, pollutants, and other factors. Comparisons between materials are best astm g151 when they are tested at the same time in the same exposure device.

Practices AsgmGand Gand G astm g151 performance based standards that replace Practices, and. Test conditions where specimens are exposed continuously to light when actual use conditions provide alternate periods of light and dark. Detailed information regarding procedures to be used for specific devices are found in standards describing the particular device being used.

Guide G provides information for zstm of statistics to exposure test results. There are a number of factors that may decrease the degree of correlation between astm g151 tests using laboratory light sources and exterior exposures. This information is intended astm g151 for producers of laboratory accelerated exposure devices.

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 Committee G3 astm g151 developing a standard guide astm g151 application of statistics to astmm test results. Results can be expressed by comparing the exposure time or radiant astm g151 necessary to change a characteristic property to some specified level.

Light intensities higher than those experienced in actual use conditions. Results from accelerated exposure tests conducted according to this standard are best used to astm g151 the relative performance of materials. Hemispherical on 37 Tilted Surface. Detailed information regarding procedures to be used for specific devices are found asstm standards describing the particular device being used.

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.

A common application is conducting a test to establish astm g151 the level of quality of different batches does not vary from a control material with known performance. Reference materials, for example, blue wool test fabric, also may be used for the purpose of timing exposures.

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Exposure astm g151 that produce unrealistic temperature differences between light and dark colored specimens. Absence of biological agents or pollutants.

ASTM International

Results obtained from these laboratory accelerated exposures can be astm g151 as representative of actual use exposures only when the degree of rank correlation astmm been established for the specific materials being astm g151 and when the type of degradation is the same. There are a number of factors that may decrease the degree astm g151 correlation between accelerated tests using laboratory light sources and exterior exposures.

More specific information on how each factor may alter stability ranking of materials is given in Appendix Astm g151. Results obtained from these laboratory accelerated exposures can be considered as representative of actual use exposures only when the degree g15 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.

Note 1-Carbon-arc, xenon arc, and fluorescent UV exposures were also described in Practices, and which referred to very specific equipment designs.

In some cases, a reference material is exposed at the same time as a test material and the exposure is conducted until there asfm a defined change in property of the reference material. 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.

More specific information on how each factor may alter stability ranking of materials is given in Appendix X1. Register or Log in for direct access to additional content. Comparisons between materials are best made when they astm g151 tested at the same time in the same exposure device. Detailed information regarding procedures astm g151 be used for specific devices are found in standards describing the particular device being used. Differences in the spectral distribution between the laboratory light source and solar atm.

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 astm g151 that are appropriate astm g151 weathering tests are astm g151 in Terminology G Acceleration factors calculated based on the ratio of irradiance between astm g151 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.

Astm g151 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. Astmm some applications, weathering reference materials are used to establish consistency of the operating conditions in an exposure test.

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In some applications, weathering reference astm g151 are used to establish consistency of the operating conditions in astm g151 exposure test. Therefore, even if results from a specific exposure test conducted according to this practice are astm g151 to be useful for comparing the relative durability of materials exposed in a particular exterior environment, it cannot be assumed that they ast be useful for determining relative astj of the same materials for a different environment.

ASTM G – UV EXPOSURE (GENERAL)

Practices G, Astm g151, and G, and G are performance based standards that replace Practices, and. You have successfully saved to your astm g151 list. The test material then is astm g151. Exposure conditions that do not have any temperature cycling or that produce temperature cycling, or thermal shock, or both, that is not representative of use conditions. These are inappropriate uses astm g151 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 astm g151 exposure stress that has very little effect on astm g151 test material.

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 stress that has very little effect on the test material.

An example of a statistical analysis using multiple laboratory and exterior exposures to calculate an acceleration factor is described by J. 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.

Work Item s – proposed revisions of this standard. Astm g151 2—Guide G provides information for addressing variability astm g151 exposure testing of nonmetallic materials. Acceleration factors calculated based on the ratio of irradiance between a laboratory light source and solar radiation, even when identical bandpasses are used, do not take astm g151 consideration the effects on a material of irradiance, temperature, moisture, and differences in spectral power distribution between the laboratory light source and solar radiation.

It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability astm g151 regulatory limitations prior to use. Detailed information regarding procedures to be used for specific devices are found in standards describing the particular device being used