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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Specimen holders should be used to support the many sizes of specimens involved in this testing. Please first verify your email before subscribing to alerts.
Current edition approved Nov. These are dependent on the ASTM test methods aatm the speci? Several years of repeat exposures are needed to get an average test result for a given location. For instance, summer exposures are generally more severe than winter exposures.
Add to Alert PDF. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine zstm applicability of regulatory limitations prior to use. If the document is revised or amended, you will be notified ast email.
The ground cover should be low-cut grass in most temperate, tropical, and subtropical areas.
Link to Active This link will always route to the current Active version of the standard. The area beneath and x1435 the vicinity of the weathering racks should be typical of the ground cover in that climatological area. As the voice of the U. It cannot be assumed, therefore, that results from one exposure in a single location will be useful for determining relative durability in ast different location. The effect of backing is highly signi?
ASTM D – 99 Standard Practice for Outdoor Weathering of Plastics
You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. Originally published as D — 56 T. The relative durability of plastics in outdoor use can be very different depending on the location of the exposure because of differences in awtm UV radiation, time of wetness, temperature, pollutants, and other factors. 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.
Exposures in several locations with different climates that represent a broad range of anticipated service ashm are recommended. Calculate retention of characteristic property according to Practice D when it is reported.
Seasonal effects are averaged in exposures of several years. They shall be covered with inert wrapping to exclude light exposure during the exposure period. The angle of the exposure rack relative to the horizontal can vary depending upon the end-use conditions that are being evaluated. 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.
When conditions of use are known, the specimen exposed will consist of the d4135 material being evaluated plus suitable backing materials to conform to projected practice.
ASTM D – 94 Standard Practice for Outdoor Weathering of Plastics
The structural members of the test racks shall not constitute a backing to the specimens under test. Table 1 shows typical UV radiant exposures for 12 months in subtropical and desert climates.
Note 2 — This standard astn ISO 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. Last previous edition D — Preferably, mark both specimen and specimen holder on the side not exposed to weather, as advanced weathering can obscure even deeply scribed marks.
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.
The values given in parentheses are for information only. Aluminum extruded shapes have been found to be suitable.
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ASTM D1435 – 13
This is the recommended method for determining exposure stages when polymer degradation is being evaluated. We have no amendments or corrections for this standard. 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.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. 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 2 — This standard and ISO The specimens are mounted in the grooves of the insulators at a? This standard is also available to be included in Standards Subscriptions. It is intended for use with finished articles of commerce as well as with all sizes and shapes of test specimens.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.