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ASTM D ISO Paints an A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Scope 1. This practice also covers the preparation of test specimens, and the evaluation of test results.
Table 1 describes commonly used test conditions. NOTE 1—Previous versions of this practice referenced? Practice G 53 has been withdrawn and replaced by Practice G , which describes performance criteria for all exposure devices that use laboratory light sources, and by Practice G , which gives requirements for exposing nonmetallic materials in?
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. Referenced Documents 2. Current edition approved July 1, Published July Originally approved in Last previous edition approved in as D — F Typical UsesE Automotive coatingsF 2 Industrial maintenance coatingsG 3 Exterior wood coatings 4 General metal coatings A The cycles described are not listed in any order indicating importance, and are not necessarily recommended for the applications listed.
Additional exposure cycles are described in Practice G B The irradiance set point given is typical for devices operated without irradiance control. Other irradiance levels may be used, but must be described in the report. C Previous editions of Practice D contained non-mandatory irradiance set points in Table 1 that were commonly used in the industry. The previous set points were 0. The measurement data used to establish these set points was inaccurate, due to an error in calibration on the part of one manufacturer.
The set points shown in this edition of D do not change the actual irradiances that have been historically used by these users. However, for users of equipment made by another manufacturer, the irradiance control system did not have the measurement inaccuracies described above, so running at the new set points will represent a change in the actual irradiance of the test. If in doubt, users should consult the manufacturer of their device for clari?
D Temperature is at equilibrium for either an uninsulated or insulated black panel, although the response of the insulated black panel might be slower than that for the uninsulated black panel.
Refer to Practice G for more information about the construction and differences between uninsulated and insulated black panels. E Typical uses do not imply that results from exposures of these materials according to the cycle described will correlate to those from actual use conditions. F SAE J describes the test used in many automotive speci?
G Historical convention has established this as a very commonly used test cycle. This cycle may not adequately simulate the effects of outdoor exposure. Terminology 3. This practice is intended to induce property changes associated with end-use conditions, including the effects of sunlight, moisture, and heat. 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.
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? Refer to Practice G for detailed information on the caveats applicable to use of results obtained according to this practice. 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 The type and rate of degradation and the performance rankings produced in exposures to?
It is recommended that at least three replicates of each material be exposed to allow for statistical evaluation of results. Apparatus 5. NOTE 4—A? Nondestructive methods are preferred because panels so measured need not be repaired.
Measure ambient temperature at a maximum distance of mm 6 in. 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. Do not place the apparatus near a heat source such as an oven. Hazards 6. Turn the device off before removing panels for inspection.
Test Specimens 7. Select panel sizes suitable for use with the exposure apparatus. Do not use this covered area of the specimen as part of the test area. 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. NOTE 6—Since the stability of the?
Nondestructive instrumental measurements are recommended whenever possible. When specimens are removed from the exposure apparatus for 24 h or more, then returned for additional exposure, report the elapsed time as noted under Section Procedure 8. Obtain agreement between all concerned parties for the speci? Additional intervals and periods of condensation may be substituted upon agreement among the concerned parties.
Seal any holes in specimens larger than 2 mm 0. Attach porous specimens to a solid backing such as aluminum that can act as a vapor barrier.
In devices that do not have a planar exposure area, reposition specimens using a procedure agreed upon by all interested parties. This condition requires that the procedures described in 8. Periods of Exposure and Evaluation of Results 9. This method is preferred over evaluating materials after an arbitrary exposure time or radiant exposure. 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.
An exposure time that produces a signi? Do not use arbitrary acceleration factors relating time in an exposure conducted according to this practice and time in an outdoor environment because they can give erroneous information.
The acceleration factor is material dependent and is only valid if it is based on data from a sufficient number of separate exterior and laboratory accelerated exposures so that results used to relate times to failure in each exposure can be analyzed using statistical methods.
NOTE 9—An example of a statistical analysis using multiple laboratory and exterior exposures to calculate an acceleration factor is described by J.
Measurements visual or instrumental should be made within a standardized time period or as agreed upon between interested parties. The standardized time period needs to consider conditioning prior to testing. Conduct these round robins according to Practice E or D and include a statistically representative sample of all laboratories or organizations that would normally conduct the exposure and property measurement. All specimens shall be exposed simultaneously in the same device.
All concerned parties must agree on the speci? Expose replicates of the test specimen and the control specimen so that statistically signi? NOTE 11—Fischer illustrates use of rank comparison between test and control materials in speci? Consider product use requirements when selecting appropriate methods. NOTE 10—For some materials, changes may continue after the speci- Report Where retention of characteristic property is reported, calculate results according to Practice D NOTE 13—In some cases, exposures are conducted by a contracting agency but property tests are conducted by the contracting party.
In these cases, the agency that conducts the exposures cannot report results from property tests. Precision and Bias Keywords Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. 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.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phone , fax , or service astm. 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.
ASTM D classification defines the standard practice for fluorescent UV and condensation exposures of paint and related coatings. Our glass reinforced polyester laminate, which is the primary material across our product range is constructed with a protective layer of gelcoat having a high thickness of - microns. The protective gelcoat serves as the first line of defense outdoors against weathering and UV exposures in extreme hot and cold climates. The standard is primarily based on the external integrity and appearance of our GRP enclosures when exposed to outdoor conditions over an extended period. 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. Thereafter the simulation, the GRP laminate is physically inspected and compared to a control specimen. The GRP laminate should not display any deterioration like chalking, flaking, wrinkling, blistering or cracking.
Historical Version s - view previous versions of standard. Work Item s - proposed revisions of this standard. More D This practice is intended to induce property changes associated with end-use conditions, including the effects of sunlight, moisture, and heat.
Accelerated Weathering (QUV) ASTM G154, ASTM D4329, ASTM D4587, ISO 4892
This document has been replaced. View the most recent version. This practice also covers the preparation of test specimens, and the evaluation of test results. Table 1 describes commonly used test conditions.
This standard describes the selection of the test conditions required for an accelerated aging through UV testing and it also covers the preparation of the specimen and the evaluation of the results. Consequently, this method allows to investigate the effects of humidity, heat and sunlight on the physical and optical attributes of the sample. The purpose of this test protocol is to determine the repercussions of sunlight, moisture and heat on the specimen and to assess its ability to retain its attributes. In order to characterize this capacity, it is necessary to induce property changes in the sample on an accelerated basis through UV testing. It is by choosing the appropriate operating conditions of the apparatus that it is possible to study the evolution of the characteristics of the coating on an accelerated pace and the collected data can be used to project the performance of the sample through the use of an acceleration factor. Moreover, it is necessary to periodically evaluate the test material in order to follow the trend of changes in the attributes over time. However, this standard is not suitable to characterize the decaying induced by localized weather phenomena such as: atmospheric pollution, biological attack, and salt water exposure.