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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The moment new editions of the standards you monitor are released, changes are made, or appendixes are published, you will be alerted by email. ASTM Committee G3 is developing a standard guide for application of statistics to exposure test results.
Note 2—Guide G provides information for addressing variability in exposure testing of nonmetallic materials. Information regarding the reporting of results from exposure testing of plastic materials is described in Practice D It is the responsibility of the user of this standard qstm establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. This information is intended primarily for producers of laboratory accelerated exposure devices.
Information regarding the reporting of results from exposure testing of plastic materials is described in Practice D Detailed information regarding procedures to be used for specific devices are found in standards describing the particular device being used. A web subscription provides an easy and secure access to standards, and you are guaranteed to satm have the latest edition.
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.
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 g51 and when the type of degradation is the same.
Note Carbon-arc, xenono-arc, and fluorescent UV exposures are also described in Practices G23, G26, and G53 which described very specific equipment designs. Specific gg151 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.
Note 5—Definitions for control and reference material that are appropriate to weathering tests are found in Terminology G Start Webshop Product catalog Product presentation.
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. This ensures that you are always up-to-date and saves you both time and money. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Read more about subscriptions. In some cases, a ast, material is exposed at the same time wstm a test material and the exposure is conducted until there is a defined change in property of the reference material.
In some applications, weathering reference materials are used to establish consistency of the operating conditions in an exposure test. Comparisons between materials are best made when they are tested at the same time in the same exposure device.
Historical Version s – view previous versions of standard.
Results can be expressed by comparing the exposure time or radiant exposure necessary to change a characteristic property to some specified level. Reference materials, aztm example, blue wool test fabric, also may be used for the purpose of timing exposures. 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. Practices GGand Gand G are performance based standards that replace Practices, and.
It is atm responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 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 1—Carbon-arc, xenon arc, and fluorescent UV exposures were also described in Practices, and which referred to very specific equipment designs. Differences in the spectral distribution between the laboratory light source and solar radiation. 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.
ASTM G | Rycobel
These acceleration factors are not valid for several reasons. You need to log in before adding standards to the monitoring service. Results from accelerated exposure tests conducted according to this standard are best used to compare the relative performance of materials. G115 on 37 Tilted Surface. In some cases, the results for the test material are compared to those for the reference material.
Acceleration factors calculated based on the ratio 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.
Specific information about methods for determining the property of a nonmetallic aastm before and after exposure are found in standards describing the method used to measure each property.
Detailed information regarding procedures to be used for specific devices are found in standards describing the particular device being used. Techstreet standards in subscription.
Variability in the rate of degradation in both actual use and laboratory accelerated asttm test can have a significant effect on the calculated acceleration factor. 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. There are a number of factors that may decrease the degree of correlation asttm accelerated tests using laboratory light sources and exterior exposures.