D Practice for Outdoor Weathering of Plastics3 4 Discontinued; see Annual Book of ASTM Standards, Vol 5 Annual Book of. astm d 塑料的室外风化 – Designation: D – 99 Standard Practice for Outdoor Weathering of Pl. Find the most up-to-date version of ASTM D at Engineering
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They shall be covered with inert wrapping to exclude light exposure during the exposure period. It is convenient to group specimens to be removed from exposure at the same time in one holder.
Note 2 — This standard and ISO It cannot be assumed, therefore, that results from one exposure in a single location will be useful for determining relative durability in a different location. As the voice of the U. Several years of repeat exposures are needed to get an average test result for a given location.
Link to Active This link will always route to the current Active version of the standard. Specimen holders should be used to support the many sizes of specimens involved in this testing. This method of mounting is shown in Fig. You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server.
Please first log in with a verified email before subscribing to alerts. It cannot be assumed, therefore, that results from one exposure in a single location will be useful for determining relative durability in a different location. NOTE 7—The same exposure stage by whichever method is used will not necessarily give the same changes in properties of the test specimen at different exposure sites. Originally published as D — 56 T.
If the document is revised or amended, you will be notified by email. This is the recommended method for determining exposure stages when polymer degradation is being evaluated.
When conditions of use are known, the specimen exposed will consist of the plastic material being evaluated plus suitable backing materials to conform to projected practice.
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In no case shall the specimen holder constitute a backing for that portion of the material to be evaluated. Fasteners used to attach specimens to the test rack shall provide for secure attachment but allow dd1435 to expand or contract with thermal changes, moisture absorption or desorption, or plasticizer loss.
Calculate retention of characteristic property according to Practice D when it is reported.
The exposure aperture of each frame shall be of sufficient size to expose the entire test area of each specimen when sufficient specimens are contained. Your comments are invited either for revision of this standard atm for additional standards and should be addressed to ASTM International Headquarters. The actual yearly values may vary widely from Table d4135. The exposure stages must be regarded as providing only a general indication of the degree of exposure, and the results should always be considered in terms of characteristics of the exposure site as well.
Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. The results of tests conducted for less than twelve months will depend on the c1435 season of the year in which they begin.
NOTE 6—Sand as a ground cover may be astn where the abrasive effects of exposure to wind-blown sand is a part of the desired exposure. Several years of repeat exposures are needed to get an average test result for a given location.
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An inherent limitation in solar-radiation measurements is that they do not re? Specimen wstm shall be in accordance with Practice G and shall be such that there is no interference with either the exposure or the subsequent testing. It is intended for use with finished articles of commerce as well as with all sizes and shapes of test specimens. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
The values given in parentheses are for information only. Precision and Bias The specimens are mounted in the grooves of the insulators at a?
Please first verify your email before subscribing to alerts. The ground cover should be low-cut grass in most temperate, tropical, and subtropical areas. NOTE 8—The results c1435 exposure stages of less than one year will depend on the season of the year in which the exposure was made.
All materials of an unknown end use application will normally be run in an 5.
Preferably, mark both specimen and specimen holder on the side not exposed to weather, as advanced weathering can obscure even asym scribed marks. 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.
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 axtm responsibility. The angle of the exposure rack relative to the horizontal can vary depending upon the end-use conditions that are being evaluated.
In desert areas in which sand is the prevailing ground cover, coarse gravel is recommended to prevent abrasion and signi? The results of tests conducted for less than 12 months will depend on the particular season of axtm year in which they begin.
Table 1 shows typical UV radiant exposures for 12 months in subtropical and desert climates. If you feel that your comments have asrm received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. Subscription pricing is determined by: 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.
We have no document history for this standard. This procedure will vary with materials, but it must be uniform in a series of tests on one material to provide comparative results.