ASTM G – 00 Standard Practice for Exposing Nonmetallic. Materials in Accelerated Test Devices that Use Laboratory. Light Sources. View on Information. ASTM G UV EXPOSURE (GENERAL). This practice provides general procedures to be used when exposing nonmetallic materials in accelerated test. 21 Jun ASTM G – Designation: G – 09 Standard Practice for Exposing Nonmetallic Materials in Ac.
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In some cases, the results for the test material are compared to those for the reference material. Monitoring Standards monitoring is a free service designed for you who wish to be alerted of changes to or new editions of the standards required in your work. This information is intended primarily for producers of laboratory accelerated exposure devices. 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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Acceleration factors are material dependent and can be significantly different for each material and for different formulations of the same material.
Link to Active This link will always route to the current Active version of the standard. These acceleration factors are not valid for several reasons. Guide G provides information for application of statistics to exposure test results. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM G | Rycobel
The benefits of a subscription: Guide G provides information for application of statistics to exposure test results Note 3—This standard is technically equivalent to ISOPart 1. 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.
Results can be expressed by comparing the astk time or radiant exposure necessary to change a characteristic property to some specified level. Specific information about methods for determining the property of a nonmetallic material before and after exposure are g15 in standards describing the method used to measure each property.
Active view current version of standard. Note 5—Definitions for control and reference material that are appropriate to weathering tests are found in Terminology G 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 established for the specific materials being tested and when the type of degradation is the same.
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. 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 Atm respectively. 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.
More specific information on how each factor may alter stability ranking of materials is given in Appendix X1. For example, detailed information axtm exposures in devices that use open flame carbon arc, enclosed carbon arc, xenon arc and fluorescent UV light source are found in Practices T151GGand G respectively.
Hemispherical on 37 Tilted Surface. Note Carbon-arc, xenono-arc, and fluorescent UV exposures are also described in Practices G23, G26, and G53 which described very specific equipment designs. Work Item astk – proposed revisions of this standard.
Acceleration factors calculated based on the asym of irradiance between a 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.
An example of a statistical analysis using multiple laboratory and exterior exposures to calculate an acceleration factor is described by J. This service is not available if you are a URL user where you do not log in with an ast address. Practices GGand Gand G are performance based standards that replace Practices, and.
Note 2—Guide G provides information for addressing variability in exposure testing of nonmetallic materials. 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.
Comparisons between materials are best made when they are tested at the same time in the same exposure device. 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.
Note Guide G provides information for addressing variability in exposure testing of nonmetallic materials. This ensures that you are always up-to-date and saves you both time and money.
Differences in the spectral distribution between the laboratory light source and solar radiation. G1151 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 atm.
Work Item s – proposed revisions of this standard. Note 1—Carbon-arc, xenon arc, and fluorescent UV exposures were also described in Practices, and which referred to very specific equipment designs. Detailed information regarding procedures to be used for specific devices are found in standards describing the particular device being used.
ASTM G – UV EXPOSURE (GENERAL)
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. 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. You need to log in before adding standards to the monitoring service. Exposure conditions that produce unrealistic temperature differences between light and dark colored specimens.
There are a number of factors that may decrease the degree of correlation between accelerated tests using laboratory light sources and exterior exposures.
The moment new editions of the standards you monitor are released, changes are made, or appendixes are published, you will be alerted by email.