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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A QUV test chamber uses fluorescent lamps to provide a radiation spectrum centered in the ultraviolet wavelengths. The exposure used in this practice is not intended to simulate the deterioration caused by localized weather axtm, such as, atmospheric pollution, biological attack, and saltwater exposure.

For instance, if two specimens are stacked vertically in each asstm, then the top and bottom specimens should switch places halfway through the test.

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ASTM D4329

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. This practice also covers the preparation of test specimens, the test conditions best suited for plastics, and the evaluation of test results.

Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards. An exposure time that produces a signicant change in one type of material cannot be assumed to be applicable to other types of materials.

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by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn. All concerned parties must agree asgm the control material used. Ketola and Douglas Grossman, eds.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. The values given in brackets are for information ast.

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ASTM D – 05 Standard Practice for Fluorescent UV Exposure of Plastics

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 asrm the world. Link to Active This link will always route to the current Active version of the standard. Signicance and Use 4. Periods of Exposure and Evaluation of Test Results 8. Expose replicates of the test specimen and the control specimen so that statistically signicant performance differences can be determined NOTE 8—Fischer illustrates use of rank comparison between test and control materials in specications.

NOTE 4—This is especially important when mechanical properties are being investigated.

ASTM D – UV EXPOSURE OF PLASTICS

NOTE 5—Since the stability of the le specimen may also be timedependent, users are cautioned that over prolonged exposure periods, or where small differences in the order of acceptable limits are anticipated, comparison of exposed specimens with the le specimen may not be valid.

This method is preferred over evaluating materials after an arbitrary exposure time or radiant exposure. Accelerated weathering provides exposed samples for comparison to unexposed control samples. Typically, flat plaques or disks are used for accelerated weathering studies.

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. Do not use arbitrary acceleration factors relating time in an exposure ast, in accordance with this practice and time in an outdoor environment because they can give erroneous information. Parts may be accommodated depending on size. NOTE 6—An example of a statistical analysis using multiple-laboratory and exterior exposures to calculate an acceleration factor is described by Simms.

NOTE 7—For some materials, changes may continue after the specimen has been removed from the exposure apparatus. It is recommended that at least three replicates of each material be exposed to allow for statistical evaluation of results. 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 Asym 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.

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Validating the specifications, value and safety of your raw materials, products and assets.

This practice also covers the preparation of test specimens, the test conditions best suited for plastics, and the evaluation of test results. Warning— Variation in results may be expected when operating conditions are varied within the accepted limits of this practice.

It is the responsibility of the user of this standard to establish appropriate safety and health ast and determine the applicability of regulatory limitations asfm to use. No direct correlation can be made between accelerated weathering duration and actual outdoor exposure duration.

A superscript epsilon e indicates an editorial change since the last revision or reapproval. Signicant factors include regulation of line voltage, temperature of the room in which the device operates, temperature control, and condition and age of the lamp. Send us a request Need help or have a question?

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

Where practical, it ashm recommended that specimens be sized to t specimen holders and racks supplied with the exposure apparatus. Your comments will receive careful consideration at a d3429 of the responsible technical committee, which you may attend.

This practice is intended to induce property changes associated with end-use conditions, including the effects of sunlight, moisture, and heat. 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.

Often several exposure times such as, and hours also will be compared to each other. Conduct these round robins in accordance with Ashm E or Practice D and include a statistically representative sample of all laboratories or organizations who would normally conduct the exposure and property measurement.