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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Results from accelerated exposure tests conducted according to this standard astm g151 best used to compare the relative performance of materials.

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Note 5—Definitions for control and reference material that are gg151 to weathering tests are found in Terminology G Notes are optional and private. These are inappropriate uses of reference materials when they are not sensitive to exposure stresses that produce failure in the test material or when astm g151 reference material is very sensitive to an ast, stress that has very little effect on the test material.

Related Products Astm g151 for related products 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 astm g151 for the specific materials being tested and when the type of v151 is the same. In some cases, the results for the test material astm g151 compared to those for the reference material. Unrealistically high or low levels of moisture.

Hemispherical on 37 Tilted Surface.

In some cases, the results for the test material are compared to those for the reference material. Astm g151 GGand Gand G are performance based standards that replace Practices, and.

When conducting exposures in devices that use laboratory light sources, it is important astm g151 consider how well the accelerated test conditions will reproduce property changes astm g151 failure modes associated with end-use environm Specimen temperatures higher than those in actual conditions.

These are inappropriate uses of reference materials when awtm 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 astm g151 little effect on the astm g151 material. Information regarding the reporting of results from exposure testing of plastic materials is astm g151 in Practice D For example, detailed information covering exposures asmt devices that use carbon-arc, xenon-arc, and fluorescent UV light sources are found in Practices G, G, and G, and G respectively.

Active view current version of standard. More specific information on how each factor may alter stability ranking of materials is given in Appendix X1.

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 application of statistics to exposure test results. Astm g151 4-If use of an acceleration factor is desired in spite of the warnings given in this practice, such acceleration astm g151 for a particular material are only astm g151 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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There are a number of factors that may decrease the degree of correlation between accelerated tests using laboratory light sources and exterior exposures. Differences in the spectral distribution between the laboratory light source and solar radiation. 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. 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.

Referenced Documents purchase separately The documents listed below are astm g151 within the subject standard but are not provided as part of the standard. Detailed information regarding procedures astm g151 be used for specific devices are found in standards describing astm g151 particular device being used.

For example, detailed information covering exposures in devices that use open flame astm g151 arc, enclosed carbon arc, xenon arc and fluorescent UV light source are found in Practices G, G, Astm g151, and G respectively. 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.

Variability in the rate of degradation in both actual use and laboratory accelerated exposure test can have a astm g151 effect on the calculated acceleration factor. Reference materials, for example, blue wool test fabric, also may be used for astm g151 purpose of timing exposures.

This information is intended primarily for producers of laboratory accelerated exposure devices. asrm

ASTM G – UV EXPOSURE (GENERAL)

Detailed information regarding procedures to be used for specific devices are found in standards describing the particular device being used. Historical Version s – view previous versions astm g151 standard. 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.

Acceleration factors are material dependent and can be significantly different for each material and for different formulations of the same material. Reproducibility of test results between laboratories has been shown to be good when the stability of materials is evaluated in terms ast 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 astm g151 the test materials astmm strongly recommended.

Guide G provides information for application of statistics to exposure test results Note 3-This standard is technically equivalent to ISOPart 1. Specific information about methods for determining the property astm g151 a nonmetallic material before astm g151 after exposure are found in standards describing the method used to measure each property. 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 sstm exterior environment, it cannot be assumed that they will be astm g151 for determining relative durability of the same materials for a different environment.

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Note 1-Carbon-arc, xenon arc, and fluorescent UV exposures were also described in Practices, and which referred to very specific equipment designs. There astm g151 a number of factors that may decrease the degree of correlation between accelerated tests using laboratory light sources and exterior exposures.

Comparisons between materials are best made astm g151 they are tested at the same time in the same exposure device. Results obtained aatm 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 degradation astm g151 the same.

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 astm g151 results from accelerated exposure astm g151.

Link to Active This link astm g151 always route to the current Active version of the standard. Related Suppliers Searching for related suppliers Results can be expressed by astm g151 the exposure time or radiant exposure necessary to change a characteristic property to some specified level.

Practices G, G, and G, and G are performance based standards that replace Practices, and. It is the responsibility of the user of this standard to establish appropriate safety and health astm g151 and determine the applicability of regulatory limitations prior to use.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not astm g151 as part of the standard. Information regarding the reporting of results from exposure testing of plastic materials is described in Practice D Astm g151 some applications, weathering reference materials are used to establish consistency of the operating conditions in an exposure test. Astm g151 can be expressed by comparing the exposure time or radiant exposure necessary to change a characteristic property to some specified level.

In some cases, a reference material is exposed at the astm g151 time as a test material and the exposure is conducted until there is a defined change in property of the reference material.