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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ASTM G – UV EXPOSURE (GENERAL)
Comparisons between materials are best made when they are tested at the same time in the same exposure device. 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. NOK 1 ,00 excl.
In some applications, weathering reference materials are used to establish consistency of the operating conditions in an exposure test. A web subscription provides an easy and secure access to standards, and you are guaranteed to always have the latest edition. 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.
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. 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 produce unrealistic temperature differences between light and dark colored specimens. Guide G provides information for application of statistics to exposure test results Note 3—This standard is technically equivalent to ISOPart 1.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Link to Active This link will always route to the current Active version of the standard.
These are inappropriate uses of reference materials when they 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 very little effect on the test material. Historical Version s – view previous versions of standard. Active view current version of standard. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
The benefits of a subscription: ASTM Committee G3 is developing a standard guide for application of statistics to exposure test results. 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.
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. Results can be expressed by comparing the exposure time or radiant exposure necessary to change a characteristic property to some specified level.
Detailed information regarding procedures to be used for specific devices are found in standards describing the particular device being used. This information is intended primarily for producers of laboratory accelerated exposure devices.
Subscription – always available and updated A web subscription provides an easy and secure access to standards, and you are guaranteed to always have the latest edition. No laboratory exposure test can be specified as a total simulation of actual use conditions in outdoor environments.
The moment new editions of the standards you monitor are released, changes are made, or appendixes are published, you will be alerted by email.
Start Webshop Product catalog Product presentation. Link g1511 Active This link will always route to the current Active version of the standard. An example of a statistical analysis using multiple laboratory and exterior exposures to calculate an acceleration factor is described by J.
Information regarding the reporting of results from exposure testing of plastic materials is described in Practice D Note 5—Definitions for control and reference material that are appropriate to weathering tests are found in Terminology G Acceleration factors are material dependent and can be significantly different for each material and for different formulations of the same material.
Test conditions where specimens are exposed continuously to light when actual use conditions provide alternate periods of light and dark. The test material then is evaluated.
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. Variability aastm the rate of degradation in both actual use and laboratory accelerated exposure test can have a g51 effect on the calculated acceleration factor. Hemispherical on 37 Tilted Surface. Exposure conditions that do not have any temperature g1511 or that produce temperature cycling, or thermal shock, or both, that is not representative of use conditions.
Read more about subscriptions. This ensures that you are always up-to-date and saves you both time and money. If you need to be able to add standards to the g511 service, you must register as a user with your own username and password. 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. Gg151 conducting exposures in devices that use laboratory light sources, it is important to consider how well the accelerated test conditions will reproduce property changes and failure modes associated with end-use environments for the materials being tested.
This service is not available if you are a URL user where you do not log in with an email address. Note 2—Guide G g15 information for addressing variability in exposure testing of nonmetallic materials.
For example, detailed information covering exposures in devices that use open flame carbon arc, enclosed carbon astmm, xenon arc and fluorescent UV light source are found in Practices GGGand G respectively. In some cases, the results for the test material are compared to those for the reference material.
There are g11 number of factors that may decrease the degree of correlation between accelerated tests using laboratory light sources and exterior exposures. These acceleration factors are not valid for several reasons. Note Carbon-arc, xenono-arc, and fluorescent UV exposures are also described in Practices G23, G26, and G53 which described very specific equipment designs. 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.
Results from accelerated exposure tests conducted according to this standard are best used to compare the relative performance of materials.