ASTM G154 PDF
ASTM G is a standard that is used as the basis for all other accelerated weathering standards that use fluorescent UV light sources to simulate exposure to. Scope: Standards include: ASTM G, ASTM D, ASTM D, ISO , SAE J The effect is being measured by exposing test samples to varying. 1 Nov Smithers Rapra laboratories references ASTM G Standard Practice for Operating Fluorescent Ultraviolet (UV) Lamp Apparatus for Exposure.
|Published (Last):||9 October 2015|
|PDF File Size:||5.27 Mb|
|ePub File Size:||7.12 Mb|
|Price:||Free* [*Free Regsitration Required]|
Historical Version s – view previous versions of standard. It may be tempting to assume that shorter wavelengths, continuous exposure, high temperatures, and other variables can result in more intense acceleration. Element has been helping companies make Certain for over years. Link to Active This link will always route to the current Active version of the standard. The standard sample holders can hold one sample 3 x 12 inches 75 x mm or two samples 3 x 6 inches 75 x mm.
Element provides both types of tests at our ISO accredited testing laboratories. In xenon arc testing, different optical filters may be applied to shift testing conditions for daylight, window glass, or extended UV spectrum exposure.
ASTM G154 and G155 Explained
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.
Typically, flat plaques t154 disks are used for accelerated weathering studies. For instance, constant exposure with no temperature cycling fails to recreate the expansion and contraction stress that materials face in outdoor locations.
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. This allows for accurate zstm.
Typically, these exposures would include moisture in the form of condensing humidity. Need help or have a question? It is impossible to recreate nature in the lab.
Such outcomes cannot be quickly obtained in outdoor settings; therefore, these weatherization tests are invaluable in timely product development.
Element can provide you with critically important data on your product or part’s performance in response to typical or extreme environmental stresses and conditions.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Often several exposure times such as, and hours also will be 1g54 to each other.
Overall, this test involves 21 days of exposure. Practice G describes general procedures to be used when exposing nonmetallic materials in accelerated test devices that use laboratory light sources. If the aim of testing is to boost color fastness, UV-A bulbs are ideal. Our team understands that florescent light has lower correlation asrm sunlight than xenon arc light; therefore, we generally recommend using the ASTM G fluorescent test to test for interior exposure i.
Accelerated Weathering (QUV) ASTM G, ASTM D, ASTM D, ISO
UV-B light accelerates the brittleness that materials, particularly polymers, may suffer as they age indoors. However, there is no simple equation for calculating exposure.
Accelerated weathering provides exposed samples for comparison to unexposed control samples.
Assurance Testing Inspection Certification. Therefore, these bulbs are useful for testing interior applications. Testing Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards. Standards can be obtained from appropriate xstm authorities. A number of exposure procedures are listed in an appendix; however, this practice does not specify the exposure conditions best suited for the material to be tested.
ASTM G and G Explained | Element
When rays of axtm UV rays—bombard a surface, they degrade smaller pigment particles, changing the surface color and creating a chalky effect. Alternatively, the exposure may simulate the effects of sunlight through window glass. Formally confirming that your products and services meet all trusted external and internal standards.
ASTM International recommends that a comparable material of identified performance a control be exposed at the same time as the test specimen. Generally, two controls are recommended: In the ASTM G test, xenon arc lamps simulate full-spectrum sunlight within a controlled test chamber. As a general guide, hours under UV-B bulbs is equivalent to 1 year of exposure asttm South Florida, while hours under UV-A bulbs can create the same exposure effects. These cycles would be continued for extended periods of time – up to thousands of hours – simulating even longer periods of time in the real world.