ASTM G is an accelerated UV ageing test using a Xenon Arc to simulate the impact of sun Exposure on coatings and other carbon based materials. 14 Sep Engaged Expert Terry Candlish discusses ASTM G and G tests which are used to evaluate sunlight and moisture exposure. ASTM. ASTM G – 00 Standard Practice for Operating Xenon Arc. Light Apparatus for Exposure of Non-Metallic Materials. View on Information Provider website.
|Published (Last):||11 December 2015|
|PDF File Size:||13.44 Mb|
|ePub File Size:||16.44 Mb|
|Price:||Free* [*Free Regsitration Required]|
Element has been helping companies make Certain for over years. From environmental and dynamic testing to highly specialized tests such as bird strike and hydrodynamic ditching testing, we’re the trusted testing partner to the world’s most recognized component and system manufacturers.
Link to Active This link will always route to the current Active version of the standard.
In the ASTM G test, xenon arc lamps simulate full-spectrum sunlight within a controlled test chamber. Ultimately, the most realistic way to test for weathering is to allow the product to degrade in real time, axtm outdoor testing panels. This practice is limited to the procedures for obtaining, measuring, and controlling conditions of exposure. We provide Xenon Arc testing, Carbon Arc testing and UV Exposure testing to simulate exposure of your products or materials to ultraviolet radiation, temperature and moisture.
Active view current version of standard. Recreate specialized conditions with filters. No other units of measurement are included in this standard. It may be tempting to assume that shorter wavelengths, continuous exposure, high temperatures, and awtm variables can result in more intense acceleration. 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.
ASTM G154 and G155 Explained
More specific information about methods for determining the change in properties after exposure and reporting these results is described in ISO Refer to Practice G for full cautionary guidance applicable to all laboratory weathering devices. Make an inquiry today. Therefore, no reference shall be made to results from the use of this practice unless accompanied by a g15 detailing the specific operating conditions in conformance with the Report Section.
As a general guide, hours under UV-B bulbs is equivalent to 1 year of exposure in South Florida, while hours under UV-A bulbs can create the same exposure effects. We can work with you to ascertain the most cost-effective, accurate testing approach for your material. This allows for accurate comparison. Cracking, peeling, de-glossing, asm, and tensile weakening are additional outcomes of exposure; sometimes such deterioration can even occur through window glass.
These exposures 1g55 include a means to introduce moisture to the test specimen.
Different types of xenon arc light sources and different filter combinations are described. When rays of sunlight—particularly UV rays—bombard a surface, they degrade smaller pigment particles, changing the surface color and creating a chalky effect.
Different UV bulbs are useful for different testing purposes. As such, the ASTM G and G tests produce comparative, not absolute data, but these comparative evaluations can still prove extremely valuable to designers.
ASTM International recommends that a comparable material of identified performance a control be exposed at the same time as the test specimen.
It is best practice to use control materials known to have relatively poor and good durability. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Therefore, these bulbs are useful for testing interior applications. Xenon Arc Testing Weatherometers used in the G and G tests approximate performance via intense exposure to the damaging elements in sunlight. However, each of these variables brings uniquely inaccurate results. Different types of xenon arc light gg155 and different filter combinations are described. Note 2 — Caution: Our Engaged Experts can help you select the best UV bulbs for your testing purposes.
Moisture takes its own toll on surfaces, and the combination of sunlight and moisture can amplify damage, costing millions of dollars of depreciation each year.
In contrast, UV-A bulbs have a propensity for accelerating color fading and yellowing. Historical Version s – view previous versions of standard. By blasting a product with UV rays, a weatherometer can simulate exposure results.
ASTM G and G Explained | Element
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.
Include a control, to act as a weatherization standard. In xenon arc testing, different optical filters may be applied to shift testing conditions for daylight, window glass, or extended UV spectrum exposure. This practice is limited to the procedures for obtaining, measuring, and controlling conditions of exposure.
For instance, constant exposure with no temperature cycling fails to recreate the expansion and contraction stress that materials face in outdoor locations. Remember, these accelerated weatherization tests cannot exactly reproduce outdoor conditions, as they cannot account for altitude, seasonal variations, local geographical features, and other variables. Note 1 — Practice G describes performance criteria for all exposure devices that use laboratory light sources. Overall, this test involves 21 days of exposure.
Exposures are not intended to simulate the deterioration caused by localized weather phenomena, such as atmospheric pollution, biological attack, and saltwater exposure.
The post ASTM G155 PDF appeared first on David Waters.
This post first appeared on David Waters Home Business Startup Help & Life Story, please read the originial post: here