QUV Accelerated Weathering test simulates the adverse consequences of long-term environmental exposure of materials and coatings. Most common standards are ASTM G154, ASTM D4329, ASTM D4587, ISO 4892, and SAE J2020. Change in physical properties, such as Haze, Color, and Impact strength, is reported.
QUV Accelerated Weathering test is done by subjecting test samples to differing levels of the most destructive components of weathering – ultraviolet radiation, moisture, and heat. The process of determining the effects of materials under certain environmental conditions is termed accelerated weathering. In this test method, UV radiation is generated from fluorescent lamps, moisture from forced condensation, and heat from installed heaters inside the QUV test chamber.
Performance under simulated conditions of rapid weathering can be compared to the performance of materials and coatings exposed to prolonged periods of real-world exposure. The various test standards include: ASTM G154, ASTM D4329, ASTM D4587, ISO 4892, SAE J2020.
Approximately 20 test samples are placed in the QUV and put through a cycle of exposure to extreme ultraviolet radiation exposure accompanied by condensation moisture exposure. Based on the expected end-use conditions, different cycles are defined; for example, a common period for automobile exterior applications will be 8 hours of UV exposure at 70° C followed by 4 hours of condensation at 50° C. These loops will be repeated for prolonged amounts of time, potentially thousands of hours, simulating much longer periods in the physical world.
For rapid weathering tests, flat plaques or disks are often used. Normal sample holders can hold one sample measuring 3 X 12 inches (75 X 300 mm) or two samples measuring 3 X 6 inches (75 X 150 mm). Parts of various sizes can be compensated.
Exposed samples from accelerated weathering conditions can be compared to unexposed control samples. Several exposure times (such as 500, 1000, and 2000 hours) are often compared to each other. Based on the performance criteria, such comparison can include measures of Haze, Transmission, Yellowness Index, Color Change, and/or physical properties including Impact Strength.
ASTM E572 test method covers the analysis of stainless and alloy steels by Wavelength Dispersive X-ray Fluorescence Spectrometry (WDXRF). It provides rapid, multi-element determinations with sufficient accuracy to assure product quality.
The ASTM D2674 is a standard test method for the analysis of sulfochromate etches solution used in the surface preparation of aluminum. The ASTM D2674 standard specifies a method for determining the efficacy of an etchant used to prepare the surface of aluminum alloys for subsequent adhesive bonding.
An immunological method for quantization of Hevea Natural Rubber (HNRL) proteins using rabbit anti-HNRL serum. Rabbits immunized with HNRL proteins react to the majority of the proteins present, and their sera have the capability to detect most if not all the proteins in HNRL.
ASTM G65 measures the resistance of metallic materials to abrasion using the dry sand/rubber wheel apparatus. The quality, durability, and toughness of the sample are determined using this test. Metallic materials are ranked in their resistance to scratching abrasion under a controlled environment.
ASTM E2141 test methods provide accelerated aging and monitoring of the performance of time-dependent electrochromic devices (ECD) integrated in insulating glass units (IGU). This test helps to understand the relative serviceability of electrochromic glazings applied on ECD.
ASTM C724 test method is used in analyzing the quality and ease of maintenance of a ceramic decoration on architectural-type glass. This test method is useful in the acknowledgment of technical standards.
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