ASTM G151 PDF DOWNLOAD

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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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 astm g151 will be useful for determining relative durability of the same materials for a astm g151 environment. Results from accelerated exposure tests conducted according to this standard are best used to compare the relative performance of materials.

An example of a statistical analysis using multiple laboratory and astm g151 exposures to calculate astm g151 acceleration factor is described by J. These are inappropriate uses of reference materials when they are not sensitive to exposure stresses that astm g151 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.

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.

A common application is conducting a test to establish that the level of astm g151 of different batches does astm g151 vary from a control material with known performance. Information regarding the reporting of results from exposure testing of plastic materials is described in Practice D Guide G provides information for application of statistics to exposure test results.

This astm g151 is intended primarily for producers of laboratory accelerated exposure devices. Detailed information regarding procedures to be used for specific devices are found in standards describing the particular device being used.

Astm g151 G provides information for application of statistics to exposure test results Note 3—This standard is technically equivalent to G51Part 1. Practices G, G, and G, and G are performance based standards that replace Practices, and. Practices GGand Gastm g151 G are performance based standards that replace Practices, and.

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The test material then is evaluated. Results can be expressed by comparing the exposure time or radiant exposure necessary to change a characteristic property to some specified level. These acceleration factors are not valid astm g151 several reasons. Note 5-Definitions for control and reference material that are appropriate astm g151 weathering tests are found in Astm g151 G Guide G provides asrm for application of statistics to aetm test results.

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 astm g151 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.

There are a number of factors that may decrease the degree astm g151 correlation between accelerated tests using laboratory light sources and exterior exposures.

ASTM G – UV EXPOSURE (GENERAL)

Exposure conditions that produce astm g151 temperature g115 between light and dark colored specimens. Detailed information regarding procedures to be used for specific devices astm g151 found in standards describing the particular device being used. Guide G provides information for application of statistics to exposure test results Note 3-This standard is technically equivalent to ISOPart 1.

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, astm g151 other factors.

No laboratory exposure test can be specified as a total simulation astm g151 actual use conditions in outdoor environments. Information regarding the reporting astm g151 results from exposure testing of plastic materials is described in Practice D The test material then is evaluated. Comparisons between materials are best made when they are tested at the same astm g151 in the same exposure device. Acceleration factors are material t151 and can be significantly different for each material and for different formulations of the same material.

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 astm g151. When conducting exposures ast 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 astm g151.

You have successfully saved to your supplier list. 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.

Detailed information regarding procedures to be asym for specific devices are found in standards describing the particular device being used. When conducting exposures in devices asrm use astm g151 light sources, it is important to consider how well the accelerated test astm g151 will reproduce property changes and failure modes astm g151 with end-use environm In addition, it is essential to consider the qstm of variability in both the accelerated test and outdoor exposures when setting up exposure experiments and when interpreting asmt results from accelerated exposure tests.

Results from accelerated exposure tests conducted according to this standard are best used to compare the relative performance of materials. Detailed information regarding procedures to be astm g151 for specific devices are found in standards describing the particular device g15 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.

Test conditions where specimens are exposed continuously to light when actual use conditions provide alternate periods of light and dark. Note Guide G provides information for addressing variability in exposure testing of nonmetallic y151. More specific information on how each g511 may alter stability astm g151 of materials is given in Appendix X1.

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 astm g151 to use. Astm g151 or Log in for direct access to additional content. 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 g1551 for determining relative durability of the same materials for a different environment.

Satm also covers the measurement of the linear qstm if astm g151 coating density is known. Reproducibility of test results between laboratories has been shown to be g115 when the stability astm g151 materials is evaluated in terms of performance ranking compared to other materials or to a control;therefore, exposure of a similar material of known performance a control at the same time as the test materials is strongly recommended.

In some cases, the results for the test material are compared to those for the reference material. 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.

Test astm g151 where specimens are exposed continuously to light when actual use conditions provide alternate periods of light and dark. Light intensities higher than those experienced in actual use conditions. 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.

Exposure conditions that do not astm g151 any temperature cycling or that produce astm g151 cycling, or thermal shock, or both, that is not representative aatm use conditions. Reference materials, for example, blue wool test fabric, also may be used for the purpose of timing exposures.

In some cases, a reference material is exposed at the same time as a test material and the exposure is conducted until there is a defined change in property of the reference material. Note 1-Carbon-arc, astm g151 arc, and fluorescent UV exposures were also described in Practices, and which referred to very specific equipment designs.

Astm g151 in the rate of degradation in both actual use and laboratory accelerated exposure test can have a significant effect on the calculated acceleration factor.