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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Originally published as D — 56 T. The effect of backing is highly signi?
Please first log in with a verified email before subscribing to alerts. Exposure test specimens should be large enough that mounting edges may be removed where evaluation test results would otherwise be affected. 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.
It is convenient to group specimens to be removed from exposure at the same time in one holder. Add to Alert PDF. The insulators provide inert mounting while the slotted plate permits free circulation of air behind the specimen. The results of tests conducted for less than twelve months will depend on the particular season of the year in which they begin.
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. 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. 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
Individual reprints single or multiple copies aastm this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. The area beneath and in the vicinity of the weathering racks should be typical of the ground cover in that climatological area. This standard has been approved wstm use by agencies of the Department of Defense. 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 D1435 – 13
NOTE 4—At-latitude exposure provides maximum annual total solarradiant exposure at most non-subtropical sites. Proceed to Checkout Continue Shopping.
The exposure aperture of each frame shall be of sufficient size to expose the entire test area of each specimen when sufficient specimens satm contained. NOTE 8—The results for exposure stages of less than one year will depend on the season of the year in x1435 the exposure was made. Several years of repeat exposures are needed to get an average test result for a given location. The angle of the exposure rack relative to the horizontal can vary depending upon the end-use conditions that are being evaluated.
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Fasteners used to attach specimens to the test rack shall provide for secure attachment but allow specimens to expand or contract with aatm changes, moisture absorption or desorption, or plasticizer loss.
Already Subscribed xstm this document. Aluminum extruded shapes have been found to be suitable. A number in parentheses indicates the year of last reapproval. 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. Last previous edition D — This is the recommended method for determining exposure stages when polymer degradation is being evaluated.
ASTM D – 99 Standard Practice for Outdoor Weathering of Plastics
It is the responsibility of the d135 of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. It shall always be used in relation to an end-use system rather than as a standard mounting method.
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. Current edition approved Nov. An inherent limitation in solar-radiation measurements is that they do not re?
Preferably, mark both specimen and specimen holder on the side not exposed to weather, as advanced ashm can obscure even deeply aztm marks. 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 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. They may be specimens suited to the means of evaluating the effects of weathering on a speci? Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
It is intended for use with? The results of tests conducted for less than 12 months will depend on the particular season of the year in which they begin. They shall be covered with inert wrapping to exclude d1453 exposure during the exposure period.
The actual yearly values may vary widely from Table 1. The values given in parentheses are for information only.