When it comes to UV Testing, what is the difference between ASTM G and ASTM G tests? Lear our latest article to learn more. Contact. Scope: Standards include: ASTM G, ASTM D, ASTM D, ISO , SAE J The effect is being measured by exposing test samples to varying. Smithers Rapra laboratories references ASTM G Standard Practice for Operating Fluorescent Ultraviolet (UV) Lamp Apparatus for Exposure.

Author: Zulkijin Gusar
Country: Costa Rica
Language: English (Spanish)
Genre: Photos
Published (Last): 5 June 2010
Pages: 432
PDF File Size: 1.22 Mb
ePub File Size: 14.56 Mb
ISBN: 308-8-72890-671-5
Downloads: 28313
Price: Free* [*Free Regsitration Required]
Uploader: Tojalar

ASTM International recommends that a comparable material of identified performance a control be exposed at the same time as the test specimen.

Therefore, no reference shall be made to results from the use of this practice unless accompanied by a report detailing the specific operating conditions in conformance with Section For instance, constant exposure with no temperature cycling fails to recreate the expansion and contraction stress that materials face in outdoor locations.

Certification Formally confirming that your products and services meet all trusted external and internal standards. Testing Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards. This practice is sstm to the procedures for obtaining, measuring, and controlling conditions of astmm. Up to 20 test samples are mounted in the QUV and subjected to a cycle of exposure to intense ultraviolet radiation followed by moisture exposure by condensation.

As such, the ASTM G and G tests produce comparative, not absolute data, but these comparative evaluations can still prove extremely valuable to designers. Hemispherical on 37 Tilted Surface.

Accelerated Weathering (QUV) ASTM G154, ASTM D4329, ASTM D4587, ISO 4892

Because xstm arc light is most similar to natural sunlight, we generally use the ASTM G test for outdoor weatherization testing.

Assurance Testing Inspection Certification. When rays of sunlight—particularly UV rays—bombard a surface, they degrade smaller pigment particles, changing the surface color and creating a chalky effect. Include a control, to act as a weatherization standard.

In this standard, the terms UV light and UV radiation are used interchangeably.


Weatherometers used in the G and G tests approximate performance via intense exposure to the damaging elements in sunlight. Parts may be accommodated depending on size. In xenon arc testing, different optical filters may be applied to shift testing conditions for daylight, window glass, or extended UV spectrum exposure.

Such outcomes cannot be quickly obtained in outdoor settings; therefore, these weatherization tests are invaluable in timely product development.

Through our network of over 43, people in 1, laboratories and offices in countries, Intertek provides quality and safety solutions to a wide range of industries around the world. Different types of fluorescent UV lamp sources are described. No direct correlation can be made between accelerated weathering duration and actual outdoor exposure duration. Cracking, peeling, de-glossing, oxidation, and v154 weakening are additional outcomes of exposure; sometimes such deterioration can even occur through window glass.

Every location on the globe has its own unique combination of damaging elements, such as pollution, salt spray, and biological attack. 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. Overall, this test involves 21 days of exposure. Auditing Consulting Sourcing Training.

ASTM G154 and G155 Explained

The standard sample holders can hold one sample 3 x 12 inches 75 x mm or aastm samples 3 x 6 inches 75 x mm. UV-B light accelerates the brittleness that materials, particularly polymers, may suffer as they age indoors. Make an inquiry today. Warning— Refer to Practice G for full cautionary guidance applicable to all laboratory weathering devices. Control samples and multiple material samples produce the best comparative data.

Ultimately, the most realistic way to test for weathering is to allow the product to degrade in real time, with outdoor testing panels. Element has been helping companies g54 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.

As a general guide, hours under V154 bulbs is equivalent to 1 year of exposure in South Florida, while hours under UV-A bulbs can create the same exposure effects. Xenon Arc Testing Weatherometers used in the G and G tests approximate performance via intense exposure to the damaging elements in sunlight. 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.


Accelerated weathering simulates damaging effects of long term outdoor exposure of materials and coatings. Wstm several exposure times such as, and hours also will be compared to each other. It may be tempting to assume that shorter wavelengths, continuous exposure, high temperatures, and other variables can result in more intense acceleration.

The ASTM G and G tests empower manufacturers to design products that can withstand exposure to sunlight and moisture. Send us a request Wilton UK: Historical Version s qstm view previous versions of standard. In contrast, UV-A bulbs have a propensity for satm color fading and yellowing. Standards can be obtained from appropriate standard authorities.

Inspection Validating the specifications, value and safety of your raw materials, products and assets. In the ASTM G test, xenon arc qstm simulate full-spectrum sunlight within a controlled test chamber.

We can work with you to ascertain the most cost-effective, accurate testing approach for your material.

Accelerated Weathering (QUV) ASTM G, ASTM D, ASTM D, ISO

Typically, flat plaques or disks are used for accelerated weathering studies. Practice G describes general procedures to be used when exposing nonmetallic materials in accelerated test devices that use laboratory light sources.

In ASTM G testing, UVA bulbs create the best correlation with outdoor exposure, as they have the closest wavelengths to damaging natural light from to nm. Exposures are not intended to simulate the deterioration caused by localized weather phenomena, such as atmospheric pollution, biological attack, and saltwater exposure.

Typically, these exposures would include moisture in the form of condensing humidity.