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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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. Current edition approved Nov. Proceed to Checkout Continue Shopping. A superscript e1435 e indicates an editorial change since the last revision or reapproval. You may delete a document from your Alert Profile at any time.
Fasteners used to attach specimens to the test rack shall provide for secure attachment but allow specimens to expand or contract with thermal changes, moisture absorption or desorption, or plasticizer loss.
ASTM D1435 – 13
Your Alert Profile lists the documents that will be monitored. This method of mounting is shown in Fig. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Exposures in several locations with different climates that represent a broad range of anticipated service conditions are recommended.
For instance, summer exposures are generally more severe than winter exposures.
Aluminum extruded shapes have been found to be suitable. Climatological variations within these areas may include those represented by desert, seashore salt airindustrial locations, tropical, and subtropical regions, plus areas exhibiting a wide range in solar radiant energy. A number in parentheses indicates the year of last reapproval. The area beneath and in the vicinity of the weathering racks should asgm typical of the ground cover in that climatological area.
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 aastm shown below.
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They shall be covered with inert wrapping to exclude light exposure during the exposure period. This procedure will vary with materials, but it must be uniform in a series of tests on one material to provide comparative results. 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.
ASTM D – 13 – Standard Practice for Outdoor Weathering of Plastics
The values given wstm parentheses are for information only. Exposure test specimens should be large enough that mounting edges may be removed where evaluation test results would otherwise be affected. The specimens are mounted in the grooves of the insulators at a? The ground cover should be low-cut grass in most temperate, tropical, and subtropical areas. 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.
The actual yearly values may vary widely from Table 1. Several years of repeat exposures are needed to get an average test result for a given location.
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Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Note 2 — This standard and ISO This standard has been approved for use by agencies of the Department of Defense. 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.
In desert areas in which sand is the prevailing ground cover, coarse gravel is recommended to prevent abrasion and signi? The relative durability of plastics in outdoor use can be very different depending on the location of the exposure because of differences in ultraviolet UV radiation, time of wetness, temperature, pollutants, and other factors. It is intended for use with finished articles of commerce as well as with all sizes and shapes of test specimens.
ASTM D – 13 Standard Practice for Outdoor Weathering of Plastics
In no case shall the specimen holder constitute a backing for that portion of the material to be evaluated. The angle of the exposure rack relative to the horizontal can vary depending upon the end-use conditions that are being evaluated. This standard is not included in any packages.
Table 1 shows typical UV radiant exposures for 12 months in subtropical and desert climates. Link to Active This link will always route to the current Active version of the standard. We have no document history for this standard.
Last previous edition D — NOTE 6—Sand as a ground cover may be desirable where the abrasive effects of exposure to wind-blown sand is a part of the desired exposure. It is convenient to group specimens to be removed from exposure at the same time in one holder. Historical Version s – view previous versions of standard. Note 1 — See Practice G24 for aging under glass. It is intended for use with finished articles of commerce as well as with all sizes and shapes of test specimens.
All materials of an unknown end use application will normally be run in an 5. Specimen marking 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? This standard is also available to be included in Standards Subscriptions.
Note 2 — This standard and ISO If the document is revised or amended, you will be notified by email.