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 relative durability sstm 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.
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. You may delete a document from your Alert Profile at any time. It is intended for use with?
Users of this standard are axtm advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
All materials of an unknown end use application will normally be run in an 5. This standard is not included in any packages.
This method of mounting is shown in Fig. This is the recommended method for determining exposure stages when polymer degradation is being evaluated. The ground cover should be low-cut grass in most temperate, tropical, and subtropical areas. Note 2 — This standard and ISO Already Subscribed to this document. For instance, summer exposures are generally more astn than winter exposures.
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. The specimens are mounted in the grooves of the insulators satm a?
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. Several years of repeat exposures are needed to get an average test result for a given location.
Specimen marking shall be in v1435 with Practice G and shall be such that there is no interference with either the exposure or the subsequent testing. 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 asstm, time of wetness, temperature, pollutants, and other factors.
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. This standard is also available to be included in Standards Subscriptions.
Note 1 — See Practice G24 for aging under glass. The area beneath and in the vicinity of the weathering racks should be typical of the ground cover in that climatological area.
A number in parentheses indicates the year of last reapproval.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. As the voice of wstm U. It is convenient to group specimens to be removed from exposure at the same time in one holder. NOTE 4—At-latitude exposure provides maximum annual total solarradiant exposure at most non-subtropical sites.
If the document is revised or amended, you will be notified by email. In desert areas in which sand is the prevailing ground cover, coarse gravel is recommended to prevent abrasion and signi?
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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. Seasonal effects are averaged in exposures of several years. Add to Alert PDF.
Standards Subsctiption may be the perfect solution. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
The values given in parentheses are for information only.