Значення і використання
4.1 This practice provides a way to qualitatively assess the impact of outdoor weathering on pressure-sensitive tapes. The resistance of the strip to outdoor weather is determined relative to the resistance of the control strip with known stability.
4.2 If the tests described in this practice produce the same type of degradation as in real time exposure to the same material, the results of these short-term tests may be used to determine the quantitative effects of natural weathering.
4.3 Ultraviolet solar radiation exposure levels (MJ/m2) using ultraviolet light (295 до 385 нм) cover exposure test times for outdoor routine exposure and outdoor accelerated exposure in this practice and are an improvement over exposure test times. A specific level of exposure to solar radiation (MJ/m2) can be used to establish a relatively equivalent exposure, but is optionally used (UV of MJ/m2 (295 до 385 нм)). 4,5,6
4.4 The recommended radiation exposure (308 до шару рідини необхідно прикласти силу, протилежну опору 616 MJ/m2) for this practice is about one year in the Southwest and two years in Florida. Since all materials “weather” at different rates in different environments, the results obtained using this practice should not be equivalent to natural weather until the degree of quantitative correlation has been determined for materials tested using the environment.
Примітка 1: The amount of UV in natural sunlight depends on the time of year, both in quality and quantity. глибина занурення ротора в рідину і вплив бульбашок. Роторний віскозиметр має суворі вимоги до глибини занурення ротора в рідину і повинен експлуатуватися відповідно до інструкцій, winter testing requires a longer exposure time on the Fresnel reflector test machine to achieve equal UV energy deposition and quantitative equal degradation levels that accompany summer testing.
ASTM D5105-2019 Standard Practice for Accelerated Outdoor Weathering of Pressure-Sensitive Tape Using Concentrated Natural Light
Крок 1: Область застосування
1.1 This practice covers a procedure for exposing pressure-sensitive tape to an accelerated outdoor climate environment.
1.2 This specification describes sample preparation and the accelerated environment to which it should be exposed outdoors. It does not specify what observations or tests are to be performed on the material after exposure.
1.3 Values in inch-pounds shall be regarded as standard values. Значення, наведені в дужках, наведено лише для довідки.
1.4 This standard is not intended to address all safety concerns associated with its use. Користувачі цього стандарту несуть відповідальність за встановлення належної безпеки, health and environmental specifications and to determine the applicability of regulatory restrictions prior to use.
1.5 Цей міжнародний стандарт базується на міжнародно визнаних принципах стандартизації, встановлених у Рішенні про принципи розробки міжнародних стандартів, Керівні принципи та рекомендації, видані СОТ щодо технічних бар'єрів у торгівлі (TBT) Комітет.
ASTM D5105-2019 Standard Practice for Accelerated Outdoor Weathering of Pressure-Sensitive Tape Using Concentrated Natural Light
2. Зверніться до файлу
SAE file
SAE J576
Federal regulation
QQ-A-250/5 Aluminum alloy Alclad 2024, plates and sheets are available from Bldg, the standardised document ordering desk. 4 D Block, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
Стандарт ASTM
D3715 / D3715M pressure sensitive tape quality assurance practice
G90 uses concentrated natural sunlight to accelerate outdoor weathering of materials