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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This practice also covers the preparation of test specimens, the test conditions best suited for plastics, and the evaluation of test results. 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 use of results obtained in accordance with this practice. Your comments are invited either for revision of this standard or aztm additional standards and should be addressed to ASTM International Headquarters.

A superscript sstm e indicates an editorial change since the last revision or reapproval. If you feel that your comments have not received a fair hearing you should aetm your views known to the ASTM Committee on Standards, at the address shown below. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

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.

For measurements 8 Fischer, R. Link to Active This link will always route to the current Active version of c4329 standard. Refer to Practice G for detailed information on the caveats applicable to use of results obtained in accordance with this practice.

ASTM D4329

Historical Version s – view previous versions of standard. 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. Periods of Exposure and Evaluation of Test Results 8. Enabling you to identify and mitigate the intrinsic risk in your operations, supply chains and business processes.

Hemispherical on 37 Tilted Surface. Standards can be obtained from appropriate standard authorities. All concerned parties must agree on the specic control material used. The values given in parentheses are for information only.

It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. The standardized time period needs to consider conditioning prior to testing.

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Ketola and Douglas Grossman, eds.

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

NOTE 7—For some materials, changes may continue after the specimen has been removed from the exposure apparatus. Accelerated weathering simulates damaging effects of long term outdoor exposure of materials and coatings. Moisture is provided by forced condensation, and temperature is controlled by heaters.

The standard aatm holders can hold one sample 3 x 12 inches 75 x mm or two samples 3 x 6 inches 75 x mm. V4329 is recommended that at least three replicates of each material be exposed to allow for statistical evaluation of results. Unless supplied with a specic backing as an integral part of the test, specimens shall be mounted so that only the minimum specimen area required for support by the holder shall be covered.

Current edition approved July 15, 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.

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

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. When a single exposure period is used, select a time or radiant exposure that will produce the largest performance differences between the test materials or between the test material and the control material.

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

D asttm 05 Standard Practice for Fluorescent UV Exposure of Plastics1 This standard is issued under the xed designation D ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. Therefore, no reference to the use of this practice should be made unless accompanied by a report prepared in accordance with Section 8 that describes the specic operating conditions used.

A QUV test chamber uses fluorescent lamps to provide a radiation spectrum centered in the ultraviolet wavelengths.

Instrumental measurements are recommended whenever possible. This method is preferred over evaluating materials after an s4329 exposure time or radiant exposure. 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. 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.

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Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Auditing Consulting Sourcing Training.

ASTM International takes no position respecting s4329 validity of any patent rights asserted in connection with any item mentioned in this standard. Conduct these round robins in accordance with Practice E or Practice D and include a statistically representative sample of all laboratories or organizations who would normally conduct the exposure and property measurement.

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. When specimens are xstm from the exposure apparatus for 24 h or more and then returned for additional exposure, report dd4329 elapsed time as noted in accordance with Section 9.

Control of ambient temperature is particularly critical when one apparatus is stacked above another, because the heat generated from the lower unit can interfere with the operation of the units above.

This unexposed surface must not be used asttm part of the test area. For instance, if two specimens are stacked vertically in each holder, then the top and bottom specimens should switch places d429 through the test. Hemispherical on 37 Degree Tilted Surface 2.

ASTM D – UV EXPOSURE OF PLASTICS

Misleading results may be obtained by this method, since the masked portion of the specimen is still exposed to temperature and humidity cycles that in many cases will affect results. Where practical, it is recommended that specimens be sized to t specimen holders and racks supplied with the exposure apparatus. A number in parentheses indicates the year of last reapproval. Last previous edition approved in as D – Validating the specifications, value and safety of your raw materials, aetm and assets.