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 method is preferred over evaluating materials after an arbitrary exposure time or radiant exposure. This practice also covers the preparation of asym specimens, the test conditions best suited for plastics, and the evaluation of test results.
This practice is intended to induce property changes associated with end-use conditions, including the effects of ultraviolet solar irradiance, moisture, and heat.
Accelerated Weathering (QUV) ASTM G154, ASTM D4329, ASTM D4587, ISO 4892
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. NOTE 7—For some materials, changes may continue after the specimen has been removed from the exposure apparatus. Precision and Bias 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.
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.
Refer to Practice G for detailed information on the caveats applicable to use of results obtained in accordance with this practice. Accelerated weathering simulates damaging effects of long term outdoor exposure of materials and coatings.
ASTM D | Rycobel
Last previous edition approved in as D – Typically, flat plaques or disks are used for accelerated weathering studies. Operate the device continuously. Assurance Testing Inspection Certification. Signicance and Use 4. No direct correlation can be made between accelerated weathering duration and actual outdoor exposure duration.
Whether your awtm is local or global, we can ensure your products meet quality, health, environmental, safety, and social accountability standards for virtually any market around the world. Global Reach Intertek is the industry leader with over 42, 4d329 in 1, locations in over countries. Refer to Practice G for detailed information on the caveats applicable to use of results obtained in accordance with this practice.
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An exposure time that produces a signicant change in c4329 type of material cannot be assumed to be applicable to other types of materials.
NOTE 6—An example of a axtm analysis r4329 multiple-laboratory and exterior exposures to calculate an acceleration factor is described by Simms. All concerned parties must agree on the specic control material used. 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.
A QUV test chamber uses fluorescent lamps to provide a radiation spectrum centered in the ultraviolet wavelengths. All concerned parties must agree on the control material used. NOTE 2—Additional information on d429 of variability and on strategies for addressing variability in the design, execution, and data analysis of laboratory-accelerated exposure asrm is found in Guide G 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.
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. It is recommended that at least three replicates of each material be exposed to allow for statistical evaluation of results.
Standards can be obtained from appropriate standard authorities. Moisture is provided by forced condensation, and temperature is controlled by heaters.
Accelerated Weathering (QUV) ASTM G, ASTM D, ASTM D, ISO
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Ketola and Douglas Grossman, eds. 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.
Attach porous specimens to a solid backing such as aluminum that can act as a vapor barrier. Do not use arbitrary acceleration factors relating time in an exposure conducted in accordance with this practice and time in an outdoor environment because they can give erroneous information. Often several exposure times such as, and hours also will be compared to each other.
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 specific operating conditions used. 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.
Accelerated weathering provides exposed samples for comparison to unexposed control samples. Validating the specifications, value and safety of your raw materials, products and assets.
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. The astk 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 ast used to relate times to failure in each exposure can be analyzed using statistical methods.
Measurements visual or instrumental should be made within a standardized time period or as agreed upon between the interested parties. Hemispherical on 37 Tilted Surface.
For measurements 8 Fischer, R. 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.
Do not place the apparatus near a heat source such as an oven. 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. Through our network of over 43, people in 1, laboratories and offices in countries, Intertek provides quality and safety solutions to a wide range asfm industries around the world. The values given in brackets are for information only.
Suggested aluminum alloys are, or Testing Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards.