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, 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. Reference materials, for example, blue wool test fabric, also may be used for the purpose of timing exposures. Test conditions where specimens are exposed continuously to sstm when actual use conditions provide alternate periods of light and dark.
G115 regarding the reporting of results from exposure testing of plastic materials is described in Practice D Read more about subscriptions. 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. 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.
There are a number of factors that may decrease the aatm of correlation between accelerated tests using laboratory light sources and exterior exposures. It is the responsibility of the user of this standard to establish appropriate safety and atsm practices and determine the applicability of regulatory limitations prior to use. No laboratory exposure test can be specified as a total simulation of actual use conditions in outdoor environments.
Hemispherical on 37 Tilted Surface.
Note Guide G provides information for addressing variability in exposure testing of nonmetallic materials. Hemispherical on 37 Tilted Surface.
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. Techstreet standards in subscription.
Results from accelerated exposure tests conducted according to this standard are best used to compare the relative performance of materials. Guide G provides information for application of statistics to exposure test results Note 3—This standard is technically equivalent to ISOPart 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 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.
The test material then is evaluated. 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 that the level of quality of different batches does not vary from a control material with known performance. 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.
ASTM G | Rycobel
Variability in the rate of degradation in both actual use and laboratory accelerated exposure test can have a significant effect on the calculated acceleration factor. NOK 1 ,00 excl. Information regarding the reporting of results from exposure testing of plastic materials is described in Practice D Comparisons between materials are best made when they are tested at the same time in the same exposure device. This ensures that you are always up-to-date and saves you both time and money.
For example, detailed information covering exposures in devices that use carbon-arc, xenon-arc, and fluorescent UV light awtm are found in Practices G, G, and G, and G respectively. 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.
Results can be expressed by comparing the exposure time or radiant exposure necessary to change a characteristic property to some specified level. Webprint Printed and bound. This information is intended primarily for producers of laboratory accelerated exposure devices. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
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. Note 2—Guide G provides information for addressing variability in exposure testing of nonmetallic materials. The benefits of a subscription: 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.
Guide G provides information for application of statistics to exposure test results. Work Item s – proposed revisions of this standard. You need to log in before adding standards to the monitoring service. 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 useful for determining relative durability of the same materials for a different environment.
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. If you need to be able to add standards to the monitoring service, you must register as a user with your own username and password.
In some cases, the results for the test material are compared to those for the reference material. Differences in the spectral distribution between the laboratory light 1g51 and solar radiation.
Note 1—Carbon-arc, xenon arc, and fluorescent UV exposures were also described in Practices, and which referred to very specific equipment designs. Link to Active This link will always route to the current Active version of the standard.