Значение и цель
5.1 Как и при любом ускоренном тесте, the increase in weathering rate compared to in-service exposure depends on the material. Поэтому, there is no acceleration factor that can be used to correlate two different types of outdoor weathering exposure. When comparing coatings with different compositions, the weatherability rankings of the coatings provided by these two programs may not be consistent. The two processes should not be used interchangeably.

5.2 The procedures described in this practice are designed to provide a higher degradation rate of coatings than those provided by fixed Angle, open, outdoor exposure racks. For many products, fixed-angle exposure will yield a higher degradation rate than the normal end use of the material.

5.2.1 For materials with higher temperature end-use conditions, using procedure A (black box) instead of open rack direct exposure is a more realistic test. For many coatings, this process provides degradation rates higher than 5° that would be provided by an open exposure facing the equator, as the black box produces higher sample temperatures and longer sample humidity times during daylight exposure. The temperature of the black box sample is comparable to that on the hood, roof and deck cover of a car parked in the sun. ASTM STP 781 gives the relative rates of gloss loss and color change resulting from exposure to procedure A in certain automotive coatings. four

5.2.2 The weathering accelerated degradation described in procedure C is generated by reflecting sunlight from ten mirrors onto the air-cooled sample area. Примерно 1400 MJ/m2 in the central Arizona climate received UV radiation exposure (295 to 385nm) during a typical year when the samples were exposed to these devices. In comparison, approximately 333 MJ/m2 central Arizona latitude exposure and 280 MJ/m2 Southern Florida latitude exposure to UV radiation during the same time period. Однако, the test described in Procedure C only reflects the beam radiation onto the test sample. The reflected direct beam of sunlight contains a lower percentage of shortwave UV radiation than global daylight, because shortwave UV is more easily scattered by the atmosphere, and because mirrors are generally less efficient at shorter UV wavelengths. The level of UV radiation exposure should not be used to calculate the acceleration coefficient because the acceleration depends on the material.

5.3 Due to differences in ultraviolet (УФ) радиация, мокрое время, температура, загрязняющие вещества, и другие факторы, the weather resistance of coatings for outdoor use can vary considerably depending on the geographical location of exposure. Поэтому, it cannot be assumed that the results of a single exposure at a single location will help determine the relative weatherability of different locations. Exposure is recommended at multiple locations with different climates that represent a wide range of expected use conditions to determine weather resistance and/or service life.

АСТМ Д 4141-2022 Темный ящик и воздействие концентрированного солнечного света на покрытия

5.4 Due to annual climate variability, the results of a single exposure test cannot be used to predict the absolute rate of material degradation.

Примечание 3: Repeated exposures of three or more years, starting at different times of the year, are typically required to obtain “средний” test results for a given location.

5.4.1 The degradation curves of many coatings are not linear functions of exposure time or radiation exposure. When short exposures are used as an indicator of weather resistance, the results obtained may not be representative of those obtained for long exposures.

Примечание 4: Guidance G141 provides information to address variability in exposure testing for non-metallic materials. Руководство G169 содержит информацию о применении статистики к результатам испытаний на воздействие..

5.5 It is recommended that at least one control material be used in any exposure assessment. The control material is used to compare the performance of the test material relative to the control when the materials are not ranked against each other. The reference material used shall have a similar composition and structure to the test material and shall have known weather resistance. Two control materials are recommended, one with relatively good weather resistance and one with poor weather resistance.

АСТМ Д 4141-2022 Темный ящик и воздействие концентрированного солнечного света на покрытия

Объем
1.1 The practice covers two accelerated outdoor exposure procedures for assessing the external weather resistance of coatings applied to substrates.

1.2 The two processes are as follows:

1.2.1 Процедура А — Black box Exposure.

1.2.2 Программа С — Fresnel reflector rack exposure.

Примечание 1: Procedure B describes the heating black box subprocedure, which is no longer in common use and has been removed from the 2014 revision of this standard.

1.3 This standard does not cover all procedures that can be used by users to accelerate the outdoor exposure of coatings. Other procedures are used to provide specific effects; Однако, the two processes described here are widely used.

1.4 Values expressed in SI units or ink-pound units should be treated separately as standard values. The values specified in each system are not necessarily the same; Поэтому, to ensure compliance with the standards, each system should be used independently of each other and the values of the two systems should not be combined.

АСТМ Д 4141-2022 Темный ящик и воздействие концентрированного солнечного света на покрытия

1.5 Настоящий стандарт не предназначен для решения всех вопросов безопасности., если таковые имеются, связанный с его использованием. Пользователь настоящего стандарта несет ответственность за установление соответствующей безопасности., практики в области здравоохранения и окружающей среды, а также для определения применимости нормативных ограничений перед использованием..

1.6 Настоящий международный стандарт был разработан в соответствии с международно признанными принципами стандартизации, установленными в Решении о принципах разработки международных стандартов., Руководящие принципы и рекомендации, выпущенные Комитетом по техническим барьерам в торговле Всемирной торговой организации.