ASTM G151 PDF
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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More specific information on how g11 factor may alter stability ranking of materials is given in Appendix X1. 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.
No laboratory exposure test can be specified as a total simulation of actual use conditions in outdoor environments. 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.
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. 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. These acceleration factors are not valid for several reasons.
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 g115 is intended primarily for producers of laboratory accelerated exposure devices.
Note 5—Definitions for control and reference material that are appropriate to weathering tests are found in Terminology G Read more about subscriptions. Detailed information regarding procedures to be used for specific devices are found in standards describing the particular device being used.
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. Guide G provides information for application of statistics to exposure test results.
ASTM G | Rycobel
Webprint Printed and bound. 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. 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.
NOK 1 ,00 excl. Exposure conditions that produce unrealistic temperature differences between light and dark colored specimens. Detailed information regarding procedures to be used for specific devices are found in standards describing the particular device being used. Variability in the rate of degradation in both actual use and laboratory accelerated axtm test can have a significant effect on the calculated acceleration factor. 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 G respectively.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Practices GGand Gand G are performance based standards that replace Practices, and.
Note 4—If use of an acceleration factor is desired in spite of ast, 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.
Work Item s – proposed revisions of this standard. Note 2—Guide G provides information for addressing variability in exposure testing ashm nonmetallic materials.
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.
Start Webshop Product catalog Product presentation. In some cases, the results for the test material are compared to those for the reference material. Techstreet standards in subscription. Work Item s – proposed revisions of this standard. The test material then is evaluated. If you awtm to be v151 to add standards to the monitoring service, you must register as a user with your own username and password. Link to Active This link will always route to the current Active version of the standard.
Reference materials, for example, blue wool test fabric, also may be used for the purpose of timing exposures.
Monitoring Standards monitoring is a free service designed for you who wish to be alerted of changes to or new editions v151 the standards required in your work. Link to Active This link will always route to the current Active version of the standard.
A web subscription provides an easy and secure access to standards, and you are guaranteed to always have the latest edition. The moment new editions of the standards you monitor are released, changes are made, or appendixes are published, you will be alerted by email. 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.
This service is not available if you are a URL user where you do not log in with an email address. ASTM Committee G3 is developing a standard guide for astn of statistics to exposure test results. Information regarding the reporting of results from exposure testing of plastic materials is described in Practice D