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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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. The results of tests conducted for less than 12 months will depend on the particular season of the year in which they begin.
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. NOTE 9—The average UV radiant exposures shown for subtropical and desert climates are based on several years of measurement in these test environments.
A superscript epsilon e indicates an editorial change since the last revision or reapproval. NOTE 4—At-latitude exposure provides maximum annual total solarradiant exposure at most non-subtropical sites.
The angle of the exposure rack relative to the horizontal can vary depending upon the end-use v1435 that are being evaluated. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? We have no amendments or corrections for this standard. This is the recommended method for determining exposure stages when sstm degradation is being evaluated. 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.
ASTM D – 94 Standard Practice for Outdoor Weathering of Plastics
The results of tests conducted for less than twelve months will depend on the particular season of the year in which they begin. They shall be covered with inert wrapping to exclude light exposure during the exposure period. The ground cover should be low-cut grass in most temperate, tropical, and subtropical areas. Standards Subsctiption may be the perfect solution.
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.
Historical Version s – view previous versions of standard. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
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. It is the responsibility of the user of this standard to establish appropriate asstm and health practices and determine the applicability of regulatory limitations prior to use.
If you feel that your comments have not received a fair hearing you should make your views known d145 the ASTM Committee on Standards, at the address shown below.
Note 1 — See Practice G24 for aging under glass. Your Alert Profile lists the documents that will be monitored. In desert areas astmm which sand is the prevailing ground cover, coarse gravel is recommended to prevent abrasion and signi? Calculate retention of characteristic property according to Practice D when it is reported.
The structural members of the test racks shall not constitute a backing to the specimens under test. Preferably, mark both specimen and specimen holder on the side not exposed to weather, as advanced weathering can obscure even deeply scribed marks.
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. Note 2 — This standard and ISO Need more than one copy?
ASTM D1435 – 13
The area beneath and in the vicinity of the weathering racks should be typical of the ground cover in that climatological area.
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. 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.
Specimen holders should be used to support the many sizes of specimens involved in this testing. Proceed to Checkout Continue Shopping. 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.
Specimen marking shall be in accordance with Practice G and asym be such that there is no interference with atsm the exposure or the subsequent testing.
astm d 塑料的室外风化_百度文库
Exposure test specimens should be large enough that mounting edges may be removed where evaluation test results would otherwise be affected. You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server.
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.
Add to Alert PDF. Precision and Bias Aluminum extruded shapes have been found to be suitable. It shall always be used in relation to an end-use system rather than as a standard mounting method. Table 1 shows typical UV radiant e1435 for 12 months in subtropical and desert climates.