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. Seasonal effects are averaged in exposures of several years. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
They shall be covered with inert wrapping to exclude light exposure during the exposure period. 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. Exposures in several locations with different climates that represent a broad range of anticipated service conditions are recommended.
In desert areas in which sand is the prevailing ground cover, coarse gravel is recommended to prevent abrasion and signi?
Add to Alert PDF. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. A number in parentheses indicates the year of last reapproval. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Need more than one copy? NOTE 7—The same exposure stage zstm whichever method is used will not necessarily give the same changes in properties of the test specimen at different exposure sites.
Current edition approved Nov. It is convenient to group specimens to be removed from exposure at the same time in one holder.
All materials of an unknown end use application will normally be run in an 5. 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. 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.
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 results of tests conducted for less than twelve months will depend on the particular season of asrm year in which they begin. 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 area beneath and in the vicinity of the weathering racks should be typical of the ground cover in that climatological area. In wstm case shall the specimen holder constitute a backing for that portion of the material to be evaluated.
ASTM D1435 – 13
Specimen marking shall be in accordance with Practice Wstm and shall be such that there is no interference with either the exposure or the subsequent testing. We have no document history for this standard. For instance, summer exposures are generally more severe than winter exposures.
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. Users of this standard are expressly advised that determination of the validity of any such patent rights, and s1435 risk of aastm of such rights, are entirely their own responsibility.
Note 1 — See Practice G24 for aging under glass. If the document is revised or amended, you will be notified by email. Your Alert Profile lists the documents that will be monitored. As the voice of the U. Note 2 — This standard and ISO The values given in parentheses are for information only. This procedure will vary with materials, but it must be uniform in a series of tests on one material to provide comparative results. Historical Version s – view previous versions of standard.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Table 1 shows typical UV radiant exposures for 12 months in subtropical and desert climates. These are dependent on the ASTM test methods for the speci? An inherent limitation in solar-radiation measurements is that they do not re?
The ground cover should be low-cut grass in most temperate, tropical, and subtropical areas. NOTE 8—The results for exposure stages of less than one year will depend on the season of the year in which the exposure was made. It is asstm for use with finished articles of commerce as well as with all sizes and shapes of test specimens.
ASTM D – 99 Standard Practice for Outdoor Weathering of Plastics
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. Originally published as D — 56 T.
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.
It is intended for use with? D1453 comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.