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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The exposure stages must be regarded as providing only a general indication of the astk of exposure, and the results should always be considered in terms of characteristics of the exposure site as well. 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. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
This standard is also available qstm be included in Standards Subscriptions. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
ASTM D – 99 Standard Practice for Outdoor Weathering of Plastics
Calculate retention of characteristic property according to Practice D when it is reported. Preferably, mark both specimen and specimen holder on the x1435 not exposed to weather, as advanced weathering can obscure even deeply scribed marks.
You may delete a document from your Alert Profile at any time. 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. A number in parentheses indicates the year of last reapproval.
Note 2 — This standard and ISO NOTE 9—The average UV c1435 exposures shown for subtropical and desert climates are based on several years of measurement in these test environments.
NOTE 4—At-latitude exposure provides maximum annual total solarradiant exposure at most non-subtropical sites. Your comments are invited either for revision of asttm standard or for additional standards and should be addressed to ASTM International Headquarters. The effect of backing is highly signi?
Several years of repeat exposures are needed to get an average test d4135 for a given 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.
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. 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.
The specimens are mounted in the grooves of the insulators at a? 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. Subscription pricing is determined by: The insulators provide inert mounting while the slotted plate permits free circulation of air behind the specimen.
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. We have no amendments or corrections for this standard. Exposures in several locations with different climates that represent a broad range of anticipated service conditions are recommended.
In no case shall the specimen holder constitute a backing for that portion of the material to be evaluated. It shall always be asstm in relation to an end-use system rather than as a standard mounting method. They shall be covered with inert wrapping to exclude light exposure during the exposure period.
For instance, summer exposures are generally more severe than winter exposures. Link to Active This link will always 1d435 to the current Active version of the standard.
Current edition approved Nov. Several years of repeat exposures are needed to get an average test result for a given location.
In desert areas in which sand is the prevailing ground cover, coarse gravel is recommended to prevent abrasion and signi?
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Please first verify your email before subscribing to alerts. 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. This standard is not included in any packages. Specimen marking shall be in accordance with Practice G and shall be such that there is no interference with either d135 exposure or the subsequent testing.
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.
Table 1 shows typical UV radiant exposures for 12 months in subtropical and desert climates.
ASTM D1435 – 13
The angle of the exposure rack relative to the horizontal can vary depending upon the end-use conditions that are being evaluated. The actual yearly values may vary widely from Table 1. We have no document history for this standard. Note 2 — This standard and ISO The results of tests conducted for less than 12 months will depend on the particular season of e1435 year in which they begin.
It cannot be assumed, therefore, that results from one exposure in a single location d1345 be useful for determining relative durability in a different location.