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 is intended to induce property changes associated with end-use conditions, including the effects of ultraviolet solar irradiance, moisture, and heat.
Suggested aluminum alloys are, or For instance, if two specimens are stacked vertically in each holder, then the top and bottom specimens should switch places halfway through the test. Global Reach Intertek is the industry leader with over 42, people in 1, locations in over countries. 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.
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.
Accelerated Weathering (QUV) ASTM G154, ASTM D4329, ASTM D4587, ISO 4892
Obtain mutual agreement between all concerned parties for the asfm exposure cycle used. Ketola and Douglas Grossman, eds. Send us a request Need help or have a question?
4d329 confirming that your products and services meet all trusted external and internal standards. It is recommended asttm at least three replicates of each material be exposed to allow for statistical evaluation of results. Refer to Practice G for detailed information on the caveats applicable to use of results obtained in accordance with this practice. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
An exposure time that produces a signicant change in one type of material cannot be assumed to be applicable to other types of materials.
Need help or have a question? 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. Accelerated weathering simulates damaging effects of long term outdoor exposure of materials and coatings.
Originally approved in 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. Whether your business 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.
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. This practice is intended to induce property changes associated with end-use conditions, including the effects of sunlight, moisture, and heat. This unexposed surface must not be used as part of the test area. Typically, flat plaques or disks are used for accelerated weathering studies.
ASTM D | Rycobel
No direct correlation can be made between accelerated weathering duration and actual outdoor exposure duration. Individual reprints single or multiple copies of d432 standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Follow the purity asmt in Practice G for water sprayed on specimen surfaces.
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.
Standards can be obtained from appropriate standard authorities. A QUV test chamber uses fluorescent lamps to provide a radiation spectrum centered in the ultraviolet wavelengths.
D — 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. Often several exposure times such as, and hours also will be compared to each other. NOTE 4—This is especially important when mechanical properties are being investigated. It is recommended that deionized water be used for water used to produce condensation.
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. Signicance and Use 4. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Accelerated Weathering (QUV) ASTM G, ASTM D, ASTM D, ISO
Attach porous specimens to a solid backing such as aluminum that can act as a vapor barrier. Refer to Practice G for detailed information on the caveats applicable to use of results obtained in accordance with this practice.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. 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.
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 Measurements visual or instrumental should be made within a standardized time period or as agreed upon between the interested parties. 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 7—For some materials, changes may continue after the specimen has been removed from the exposure apparatus. 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.
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 D329 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.