ASTM G154-12 PDF

These exposures may include a means to introduce moisture to the test specimen. Exposures are not intended to simulate the deterioration caused by localized weather phenomena, such as atmospheric pollution, biological attack, and saltwater exposure. Alternatively, the exposure may simulate the effects of sunlight through window glass. Typically, these exposures would include moisture in the form of condensing humidity.

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Enabling you to identify and mitigate the intrinsic risk in your operations, supply chains and business processes. Learn More. Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards. Validating the specifications, value and safety of your raw materials, products and assets.

Formally confirming that your products and services meet all trusted external and internal standards. Accelerated weathering simulates damaging effects of long term outdoor exposure of materials and coatings. A QUV test chamber uses fluorescent lamps to provide a radiation spectrum centered in the ultraviolet wavelengths.

Moisture is provided by forced condensation, and temperature is controlled by heaters. No direct correlation can be made between accelerated weathering duration and actual outdoor exposure duration. However, performance comparisons under controlled conditions of accelerated weathering can be compared to documented performance of the materials and coatings that have experienced extended periods of end use exposure.

Testing Procedure: 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. 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.

Specimen size: Typically, flat plaques or disks are used for accelerated weathering studies. 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. Depending on size parts may be accommodated.

Data: Accelerated weathering provides exposed samples for comparison to unexposed control samples. Often several exposure times such as , , and hours also will be compared to each other.

Standards can be obtained from appropriate standard authorities. Intertek Global Website. Toggle navigation Intertek. Industries Services. Assurance Enabling you to identify and mitigate the intrinsic risk in your operations, supply chains and business processes. Testing Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards.

Inspection Validating the specifications, value and safety of your raw materials, products and assets. Certification Formally confirming that your products and services meet all trusted external and internal standards. Assurance Testing Inspection Certification. Through our network of over 46, people in 1, laboratories and offices in countries, Intertek provides quality and safety solutions to a wide range of industries around the world.

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ASTM G154 and G155 Explained

Historical Version s - view previous versions of standard. More G Typically, these exposures would include moisture in the form of condensing humidity. Exposures are not intended to simulate the deterioration caused by localized weather phenomena, such as atmospheric pollution, biological attack, and saltwater exposure. Alternatively, the exposure may simulate the effects of sunlight through window glass. Warning— Refer to Practice G for full cautionary guidance applicable to all laboratory weathering devices.

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ASTM G154-12 PDF

Enabling you to identify and mitigate the intrinsic risk in your operations, supply chains and business processes. Learn More. Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards. Validating the specifications, value and safety of your raw materials, products and assets. Formally confirming that your products and services meet all trusted external and internal standards. Accelerated weathering simulates damaging effects of long term outdoor exposure of materials and coatings.

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ASTM G154-12测试标准

When rays of sunlight—particularly UV rays—bombard a surface, they degrade smaller pigment particles, changing the surface color and creating a chalky effect. Cracking, peeling, de-glossing, oxidation, and tensile weakening are additional outcomes of exposure; sometimes such deterioration can even occur through window glass. 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. The ASTM G and G tests empower manufacturers to design products that can withstand exposure to sunlight and moisture.

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

Designation: G? OperaIng Fluorescent. It is recommended that at least three replicates of each material evaluated be exposed in each test to allow for statistical evaluation of results. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. Masking or shielding the face of test specimens with an opaque cover for the purpose of showing the effects of exposure on one panel is not recommended.

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