ASTM D defines fluorescent UV and condensation exposures of paint and related coatings,equivalent to ISO This standard is issued under the fixed designation D; the number 1 This practice is under the jurisdiction of ASTM Committee D01 on Paint and. Related. ASTM D Standard Practice for Fluorescent UV-Condensation Exposures of Paint and Related Coatings CONTAINED IN VOL. , Outlines test.
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All concerned parties must agree on the speci? Note 1—Previous versions of this practice referenced fluorescent UV devices described by Practicewhich described very d487 equipment designs.
ASTM D _UV_resistance_百度文库
The set points shown in this edition of D do not change the actual irradiances that have been historically used by these users. Refer to Practice G for detailed information on the caveats applicable to use of results obtained according to this practice. This method is preferred over evaluating materials after an arbitrary exposure time or radiant exposure.
When specimens are removed from the exposure apparatus for 24 h or qstm, then returned for additional exposure, report the elapsed time as noted under Section How is it tested? The standard is primarily based on the external integrity and appearance of our GRP enclosures when exposed to outdoor conditions over an extended period. What is the test? NOTE 11—Fischer illustrates use of rank comparison between test and control materials in speci?
The standardized time period needs to consider conditioning prior asttm testing. 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.
Accelerated Weathering (QUV) ASTM G, ASTM D, ASTM D, ISO
Measurements visual or instrumental should be made within a standardized time period or as agreed upon between interested parties. Where retention of characteristic property is reported, calculate results according to Practice D Interlaboratory comparisons are valid only when all laboratories use the same design of fluorescent UV device, lamp, and exposure conditions.
Additional intervals and periods of condensation may be substituted upon agreement among the concerned parties.
Adherence to the standard is mandatory across the GCC region and globally. The set points shown in this edition of D d5487 not change the actual irradiances that have been historically used by these users. Obtain agreement between all concerned parties for the speci?
Practice G 53 has been withdrawn and replaced by Practice Gwhich describes performance criteria for all exposure devices that use laboratory light sources, and by Practice Gwhich gives requirements for exposing nonmetallic materials in? Baked coatings Radiation-cured coatings All other coatings 24 h 24 h 7 days 5. Typically, flat plaques or disks are used for accelerated weathering studies. A superscript astk e indicates an editorial change since the last revision or reapproval.
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. 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 previous set points were 0.
Table 1 describes commonly axtm test conditions. If in doubt, users should consult the manufacturer of their device for clari? Work Item s – proposed revisions of this standard.
This practice is intended to induce property changes associated with end-use conditions, including the effects of sunlight, moisture, and heat. Select panel sizes suitable for use with the exposure apparatus. Other irradiance levels may be used, but must be described in the report.
Periods of Exposure and Evaluation of Results 9. Our glass reinforced polyester laminate is tested in a controlled laboratory with a simulation of accelerated weather with an exposure cycle of 8 hours UV followed by 4 hours condensation continuously.
Additional exposure cycles are described in Practice G The type and rate of degradation and the performance rankings produced in exposures to? Therefore, no reference to the use of this practice shall be made unless accompanied by a report prepared according to Section 10 that describes the speci? A number in parentheses indicates the year of last reapproval.
B The irradiance set point given is typical for devices operated without irradiance control.
Accelerated Weathering (QUV) ASTM G154, ASTM D4329, ASTM D4587, ISO 4892
Attach porous specimens to a solid backing such as aluminum that can act as a vapor barrier. 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.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. The values given in parentheses are for information only. 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. G Historical convention has established this as a very commonly used test cycle.
All specimens shall be exposed simultaneously in the same device.
A QUV test chamber uses fluorescent lamps to provide a radiation spectrum centered in the ultraviolet wavelengths. NOTE 3—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