ASTM D4329 PDF

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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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If you feel that your comments have not received a fair hearing you should make your views e4329 to the ASTM Committee on Standards, at the address shown below.

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. All astk parties must agree on the specic control material used. Last previous edition approved in as D – ASTM International takes no position respecting the x4329 of any patent rights asserted atsm connection with any item mentioned in this standard.

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

A QUV test chamber uses fluorescent lamps to provide a radiation spectrum centered in the ultraviolet wavelengths. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. 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.

Operate the device continuously. Typically, flat plaques or disks are used for accelerated weathering studies. Accelerated weathering simulates damaging effects of long term outdoor exposure of materials and coatings.

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Misleading results may be obtained by this method, since the masked portion d4392 the specimen is still exposed to temperature and humidity cycles that in many cases will affect results. Refer to Practice G for detailed information on the caveats astmm to use of results obtained in accordance with this practice.

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

Hemispherical on 37 Tilted Surface. An exposure time that produces a signicant change in one type of material cannot be assumed to be applicable to other types of materials. All specimens shall be exposed simultaneously in the same device.

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Ast, Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards. 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.

This method is preferred over evaluating materials after an arbitrary exposure time or radiant ast. 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.

Inspection Validating the specifications, value and safety of your raw materials, products and assets. 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 Enabling you to identify and mitigate the intrinsic risk in your operations, supply chains and business processes.

ASTM D – UV EXPOSURE OF PLASTICS

Do not place the apparatus near a heat source such as an oven. 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.

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Parts may be accommodated depending on size. 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 Moisture is provided by forced condensation, and temperature is controlled by heaters.

For measurements 8 Fischer, R.

ASTM D4329

This unexposed surface must not be used as part of the test area. Periods of Exposure and Evaluation of Test Results 8. Current edition approved July 15, 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.

Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards.

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. 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.

Assurance Testing Inspection Certification. The values given in brackets are for information only. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

NOTE 7—For some materials, changes may continue after the specimen has been removed from the exposure apparatus. Precision and Bias