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.
|Genre:||Health and Food|
|Published (Last):||3 August 2015|
|PDF File Size:||18.14 Mb|
|ePub File Size:||1.40 Mb|
|Price:||Free* [*Free Regsitration Required]|
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.
Variability in astk rate of degradation in both actual use and laboratory accelerated exposure test can have a significant effect on the calculated acceleration factor.
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 atsm. Guide G provides information for application of statistics to exposure test results. Note Carbon-arc, xenono-arc, and fluorescent UV exposures are also described in Practices G23, G26, and G53 which described very specific equipment designs.
Webprint Printed and bound. Active view current version of standard.
The test material then is evaluated. 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.
Acceleration factors are material asm 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.
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.
For example, detailed information covering exposures in awtm that use open flame carbon arc, enclosed carbon arc, xenon arc and fluorescent UV light source are found in Practices GGGand G atm. 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 applications, weathering reference materials are used to establish consistency of the operating conditions in an exposure test. Read more about subscriptions. 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.
An example of a statistical analysis using multiple laboratory and exterior exposures to calculate an acceleration factor is described by J. NOK 1 ,00 excl.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Note 1—Carbon-arc, xenon arc, and fluorescent UV exposures were also described in Practices, and which referred to very specific equipment designs.
ASTM G – UV EXPOSURE (GENERAL)
This information is intended primarily for producers of laboratory accelerated exposure devices. ASTM Committee G3 is aastm a standard guide for application of statistics to exposure test results. A common application is conducting a test to sstm that the level of quality of different batches does not vary from a control material with known performance.
For example, detailed information covering exposures in devices that use carbon-arc, xenon-arc, asmt fluorescent UV light sources are found in Practices G, G, and G, and G respectively. When 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.
Note 5—Definitions for control and reference material that are appropriate to weathering tests are found in Terminology G Hemispherical on 37 Tilted Surface. Monitoring Standards monitoring is a free service designed for you who wish to be alerted of changes to atsm new editions of the standards required in your work.
Reference materials, for example, blue wool test fabric, also may be used for the purpose of timing exposures. Note 2—Guide G provides information for addressing variability in exposure testing of nonmetallic materials.
Work Item s – proposed revisions of this standard. Practices GG asrm, and Gand G are performance based standards that replace Practices, and.
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 can be expressed by comparing the exposure time or radiant exposure necessary to change a characteristic property to some specified level. 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. A web subscription provides an easy and secure access to standards, and you are guaranteed to always have the latest edition. Note Guide G provides information for addressing variability in exposure testing of nonmetallic materials.