It is recommended that at least three replicates of each material be exposed to allow for statistical evaluation of results. Accelerated weathering provides exposed samples for comparison to unexposed control samples. Typically, flat plaques or disks are used for accelerated weathering studies. This practice also covers the preparation of test specimens, and the evaluation of test results. Current edition approved July 1,
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Our glass reinforced polyester laminate, which is the primary material across our product range is constructed with a protective layer of gelcoat having a high thickness of - microns.
Consider product use requirements when selecting appropriate methods. Nondestructive instrumental measurements are recommended whenever possible.
Nondestructive methods are preferred because panels so measured need not be repaired. The standard sample holders can hold one sample 3 x 12 inches 75 x mm or two samples 3 x 6 inches 75 x mm.
Measurements visual or instrumental should be made within a standardized time period or as agreed upon between interested parties. Our laminate is type tested at the renowned international testing laboratory Exova to certify our products to be weather resistant.
C Previous editions of Practice D contained non-mandatory irradiance set points in Table 1 that were commonly used in the industry.
F SAE J describes the test used in many automotive speci? Therefore, no reference to the use of this practice shall be made unless accompanied by a report prepared according to Section 10 that describes the speci? G Historical convention has established this as a very commonly used test cycle.
ASTM D _UV_resistance_百度文库
Additional exposure cycles are described in Practice G It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine axtm applicability of regulatory limitations prior to use.
Water resistance of th Up to 20 test samples are mounted in the QUV and subjected to a cycle of exposure to intense ultraviolet atsm followed by moisture exposure by condensation. Enabling you to identify and mitigate the intrinsic risk in your operations, supply chains and business processes.
Originally approved in Periods of Exposure and Evaluation of Results 9. This method is preferred over evaluating materials after an arbitrary exposure time or radiant exposure.
ASTM D classification test for weather and UV resistance
This practice also covers the preparation of test specimens, and the evaluation of test results. Other irradiance levels may be used, but must be described in the report. 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.
Do not aetm the apparatus near a heat source such as an oven. Do not use this covered area of the specimen as part of the test area.
Seal any holes in specimens larger than 2 mm 0. However, for users of equipment made by another manufacturer, the irradiance control system did not have the measurement inaccuracies described above, so running at the new set points will represent a change in the actual irradiance of the test. If in doubt, users should consult the manufacturer of their device for clari? Often several exposure times such as, and hours also will be compared to each other.
Accelerated Weathering (QUV) ASTM G154, ASTM D4329, ASTM D4587, ISO 4892
If in doubt, users should consult the manufacturer of their device for clarification. Precision and Bias All concerned parties must agree on the speci?
Interlaboratory comparisons are valid only when all laboratories use the same design of fluorescent UV device, lamp, and exposure conditions.
Obtain agreement between all concerned parties for the speci? Conduct these round robins according to Practice E or D and include a statistically representative sample of all laboratories or organizations that would normally conduct the exposure and property measurement. Send us a d458 Need help or have a question? Practice G 53 has been withdrawn and replaced by Practice Gwhich describes performance criteria for all exposure devices that use laboratory light sources, and by Practice Gwhich gives requirements for exposing nonmetallic materials in?