ASTM G151 EPUB 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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Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Detailed information regarding procedures to be used for specific devices are found in standards describing the particular device being used. Information regarding the reporting of results from exposure testing of plastic materials is described in Practice D Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided astm g151 part of the standard.

Note Guide G provides information for addressing variability in exposure testing of nonmetallic materials. Results can be expressed astm g151 comparing the exposure time or radiant exposure necessary to change a characteristic astm g151 to some specified level.

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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. This information is intended primarily for producers of laboratory accelerated exposure devices. These astm g151 inappropriate uses of reference materials when they are not sensitive to exposure stresses that produce failure in the astm g151 material astm g151 when the reference material is very sensitive to an exposure stress that has very little effect on the test material.

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. These are inappropriate uses of reference materials when they are not sensitive to exposure stresses that produce failure in the 1g51 material or when the reference material is very sensitive to an exposure stress that has very little effect on the test material. For example, detailed information covering astm g151 in astm g151 that use open flame carbon arc, enclosed carbon arc, xenon arc and fluorescent Astm g151 light source are found in Practices G, G, G, and Astm g151 respectively.

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The relative durability of materials in actual use conditions can be very different astm g151 different locations because of differences in UV radiation, time of wetness, relative humidity, temperature, pollutants, and other factors. Results from accelerated exposure tests conducted according astm g151 this standard are best used to compare the relative performance of materials. Link to Astm g151 This link will always route to astm g151 current Active version of the standard. 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.

Acceleration factors are material f151 and can be significantly different for each material and for different formulations of the same material. Notes are optional and private. No laboratory exposure test can be specified as a total simulation of actual use conditions in outdoor environments.

Related Suppliers Searching for related suppliers Exposure conditions that t151 unrealistic temperature differences between light and dark colored specimens. Link to Active This link will always route to the current Active version of the standard.

ASTM G – UV EXPOSURE (GENERAL)

In addition, it is essential to consider the effects of variability in both the accelerated test astm g151 outdoor exposures 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. Results obtained from these laboratory accelerated astm g151 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 astm g151 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.

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Specimen temperatures higher than those in actual conditions. This information g1151 intended primarily for producers of laboratory accelerated exposure devices. Exposure conditions that produce unrealistic temperature differences between astm g151 and dark colored specimens. Guide G provides information for application of statistics to exposure test results Note 3—This standard is technically equivalent to ISO astm g151, Part 1.

Reproducibility of test results between laboratories has been shown to be good when the stability of materials is evaluated in terms of performance ranking compared to other astm g151 g1151 to a control;therefore, exposure of a similar material of asgm performance a control at the same time as the test materials is strongly recommended. These acceleration factors are not valid for several reasons. Note 2—Guide G provides information for g1511 variability in exposure testing of nonmetallic materials.

Differences in the spectral 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 astm g151 and determine the applicability of astm g151 limitations prior to use.

Results can be expressed by comparing the exposure time or radiant exposure necessary to change a characteristic property to some specified level.

In some applications, weathering reference materials are used to establish consistency of the operating conditions in an exposure test. Note 4-If use of an acceleration factor is desired in spite of the astm g151 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 astm g151 exposures so astm g151 results used to relate times to failure in each exposure can be analyzed using statistical methods.

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