ASTM D4329 PDF

ASTM D tests for fluorescent UV exposure of plastics. It covers specific procedures and test conditions based on practices ASTM G and ASTM G This standard is issued under the fixed designation D ; the number 1 This practice is under the jurisdiction of ASTM Committee D on Plastics. ASTM D – Designation: D – 05 Standard Practice for Fluorescent UV Exposure of Pla.

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Ketola and Douglas Grossman, eds.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn. Do not place the apparatus near a heat source qstm as an oven.

ASTM D | Rycobel

This practice is intended to induce astn changes associated with end-use conditions, including the effects of ultraviolet solar irradiance, moisture, and heat. D43329 values given in parentheses are for information only. The acceleration factor is materialdependent and is only valid if it is based on data from a sufficient number of separate exterior and laboratoryaccelerated exposures so that results used to relate times to failure in each exposure can be analyzed using statistical methods.

The exposure used in this practice is not intended to simulate the deterioration caused by localized weather phenomena, such as, atmospheric pollution, biological attack, and saltwater exposure. NOTE 4—This is especially important when mechanical properties are being investigated. This practice also covers the preparation of test specimens, the test conditions best suited for plastics, and the evaluation of test results. Typically, flat plaques or disks are used for accelerated weathering studies.

However, performance comparisons under the controlled conditions of accelerated weathering can be compared to documented performance of materials and coatings that have experienced extended periods of end use exposure. Moisture is provided by forced condensation, and temperature is controlled by heaters. An exposure time that produces a signicant change in one type of material cannot be assumed to be applicable to other types of materials.

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Global Reach Intertek is the industry leader with over 42, people in 1, locations in over countries. Testing Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards. When specimens are removed from the exposure apparatus for 24 h or more and then returned for additional exposure, report the elapsed time as noted in accordance with Section 9.

The values given in brackets are for information only.

Accelerated weathering simulates damaging effects of long term outdoor exposure of materials and coatings. Where practical, it is recommended that specimens be sized to t specimen holders and racks supplied with the exposure apparatus. Therefore, no reference to the use of this practice should be made unless accompanied by a report prepared in accordance d43329 Section 8 that describes the specic operating conditions used.

NOTE 7—For some materials, changes may continue after the specimen has been removed from the exposure apparatus. Standards can be obtained from appropriate standard authorities. Operate the device continuously. D — 05 Standard Practice for Fluorescent UV Exposure of Plastics1 This standard is issued under c4329 xed designation D ; the number immediately following the designation indicates e4329 year of original adoption or, in the case of revision, the year of last revision.

NOTE 6—An example of a statistical analysis using multiple-laboratory and exterior exposures to calculate an acceleration factor is described by Simms. Follow the purity requirements in Practice G for water sprayed on specimen surfaces. A superscript epsilon e indicates an editorial change since the last revision or reapproval.

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

Warning— Variation in results may be expected when operating conditions are varied within the accepted limits of this practice.

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Significant factors include regulation of line voltage, temperature of the room in which the device operates, temperature control, and condition and age of the lamp. Measurements visual or instrumental should be made within a standardized time period or as agreed upon between the interested parties. If four specimens are stacked vertically, then the specimens should be repositioned vertically three adtm during the test.

All concerned parties must agree on the specic control material used. Obtain mutual agreement between all concerned parties for the specic exposure cycle used. Refer to Practice G for detailed information on the caveats applicable to wstm of results obtained in accordance with this practice. NOTE 2—Additional information on sources of variability and on strategies for addressing variability in the design, execution, and data analysis of laboratory-accelerated exposure tests is found in Guide G Assurance Enabling you to identify and mitigate the intrinsic risk in your operations, supply chains and business processes.

ASTM D4329

For instance, if two specimens are stacked vertically in each holder, then the top and bottom specimens should switch places halfway through the test. Inspection F4329 the specifications, value and safety of your raw materials, products and assets.

No direct correlation can be made between accelerated weathering duration and actual outdoor exposure duration. Measure ambient temperature at a maximum distance of mm [6 in.

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.

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