Wir benötigen Ihre Einwilligung zur Verwendung der einzelnen Daten, damit Sie unter anderem Informationen zu Ihren Interessen einsehen können. Klicken Sie auf "OK", um Ihre Zustimmung zu erteilen.
Standard Practice for Performing Outdoor Accelerated Weathering Tests of Plastics Using Concentrated Sunlight
Automatische name übersetzung:
Standard Praxis für Darstellende Außenwitterungsbelastung von Kunststoffen unter Verwendung von konzentriertem Sonnenlicht
NORM herausgegeben am 15.7.2013
Bezeichnung normen: ASTM D4364-13
Anmerkung: UNGÜLTIG
Ausgabedatum normen: 15.7.2013
SKU: NS-26959
Zahl der Seiten: 6
Gewicht ca.: 18 g (0.04 Pfund)
Land: Amerikanische technische Norm
Kategorie: Technische Normen ASTM
Keywords:
Fresnel-reflector system, natural weathering, plastic, pyrheliometer, ICS Number Code 83.080.01 (Plastics in general)
Significance and Use | ||||||||||||||||||||||||||||
4.1 This practice involves the concentration of sunlight by a system of plane mirrors, arranged to simulate a parabolic trough focused on an air-cooled target board on which the test specimens are mounted. Exposure cycles with and without water spray that are commonly used for this method are described in 4.1.1 Accelerated outdoor exposure tests performed using this practice in an absence of a programmed moisture cycle are intended to simulate conventional exposure testing on racks facing the equator in desert and arid regions. 4.1.2 Accelerated outdoor exposure tests performed using this practice with a programmed moisture cycle shall possess the feature of spraying high purity water on the specimens in a regular, periodic fashion that is intended to simulate the results of conventional exposure testing on fixed racks facing the equator in subtropical, semi-humid, and temperate regions. Water-spray cycles that are recommended by this practice are given in 4.2 The effectiveness of the Fresnel-reflector accelerated outdoor weathering test machines depends primarily on the amount and character of the UV in the direct-beam component of sunlight. 4.3 Testing to specific levels
(quantities) of solar ultraviolet radiant exposure is recommended.
Elapsed time exposure-level determinations shall not be used for
testing with this practice. Testing to specific levels of UV
irradiation, whether to total UV or within selected wavebands, is
an effective method for improving agreement between wintertime and
summertime testing on the Fresnel-reflector weathering-test
machines. Other seasonal factors such as temperature and time of
wetness can affect the weathering of test specimens
significantly.
4.4 The weathering machines described provide for specimen cooling that reduces thermal problems in most materials. It is recommended that monthly temperature measurements be performed on heat-sensitive plastics to record the typical monthly test specimen temperatures. 4.5 Since the natural environment
varies with respect to time, geography, and topography, it can be
expected that the effects of natural exposure will vary
accordingly. Furthermore, all materials are not affected equally by
increased irradiance and temperature. The quantitative correlation
between exposures conducted in accordance with this practice and
those conducted under specified natural exposure conditions will
therefore vary with the type and composition of the material.
4.6 While reference materials tested in accordance with this practice and Practices G7 and D1435 are useful for providing information on the relationship between accelerated and real-time tests, the acceleration factor found for the reference material cannot be used to extrapolate results of the accelerated test to predict lifetimes under natural exposure except for the specific material for which the relationship has been established. |
||||||||||||||||||||||||||||
1. Scope | ||||||||||||||||||||||||||||
1.1 This practice covers the use of Fresnel-reflecting concentrators that use the sun as a source of ultraviolet (UV) and longer wavelength radiation. Such devices are used in the outdoor accelerated exposure testing of plastics. 1.2 This practice provides a procedure for performing outdoor accelerated exposure testing of plastics using a Fresnel-reflector outdoor accelerated weathering test machine. The apparatus is described herein and in Practice G90 more completely. 1.3 This practice is applicable to a range of plastic materials including, but not limited to, plastic films, sheets, laminates, and extruded and molded products in a variety of shapes and sizes, as specified in 8.2 and 8.3. 1.4 This practice describes test conditions that attempt to simulate plastics exposures in desert and subtropical climates. Specimen preparation, property testing procedures, and the evaluation of results are covered in existing test methods or specifications for specific materials. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 This standard does not
purport to address all of the safety concerns, if any, associated
with its use. 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.
ISO 877-3: 2009 Plastics--Methods of exposure to solar
radiation--Part 3: Intensified weathering using concentrated solar
radiation Standard Practice for Outdoor Weathering
of Plastics Standard Terminology for Abbreviated
Terms Relating to Plastics (Withdrawn 2024) Standard Test Method for Silica in Water
(Includes all amendments and changes 12/6/2021). Standard Terminology Relating to
Plastics Standard Practice for Sampling of
Plastics (Withdrawn 1998) Standard Practice for Conducting Black
Box and Solar Concentrating Exposures of Coatings Standard Test Method for Transfer of
Calibration From Reference to Field Radiometers (Includes all
amendments and changes 6/6/2018). Standard Test Method for Low-Level Total
Silica in High-Purity Water by Flameless Atomic Absorption
Spectroscopy Standard Terminology Relating to Natural
and Artificial Weathering Tests of Nonmetallic Materials Standard Practice for Performing
Accelerated Outdoor Weathering of Materials Using Concentrated
Natural Sunlight Standard Practice for Atmospheric
Environmental Exposure Testing of Nonmetallic Materials Standard Practice for Conducting
Exposures to Daylight Filtered Through Glass Standard Terminology of Solar Energy
Conversion |
Historisch
1.11.2013
Historisch
1.7.2010
Historisch
1.3.2007
Historisch
15.5.2010
Historisch
1.4.2011
Historisch
15.5.2012
Wollen Sie sich sicher sein, dass Sie nur die gültigen technischen Normen verwenden?
Wir bieten Ihnen eine Lösung, die Ihnen eine Monatsübersicht über die Aktualität der von Ihnen angewandten Normen sicher stellt.
Brauchen Sie mehr Informationen? Sehen Sie sich diese Seite an.
Letzte Aktualisierung: 2024-11-04 (Zahl der Positionen: 2 209 323)
© Copyright 2024 NORMSERVIS s.r.o.