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- Standard / ASTM-D-4329-13
ASTM D4329-13 -Standard Testing Instruments
Due to the effects of ultraviolet radiation, moisture, and heat cycling, plastic materials that are rated for outdoors and semi-outdoor conditions will degrade over time—losing color, gloss, mechanical strength, and surface integrity. To reproduce these degradation effects in a controlled laboratory environment, precisely defined exposure conditions have to be taken into account to simulate exposure to sunlight combined with dew formation and rainfall. ASTM D4329-13 specifies the test conditions and exposure cycles for evaluating UV weathering resistance of plastics using fluorescent UV lamp apparatus. Presto Stantest's UV weathering test chambers deliver the precise irradiance control, programmable cycle management, and stable temperature and humidity regulation that ASTM D4329-13 compliant plastic weathering evaluation demands.
Standard Test Method for Fluorescent (UV) Ultraviolet Lamp Apparatus Exposure of Plastics
The test method explains the test conditions and test procedures that are applicable for fluorescent UV exposure of plastics that are conducted in accordance with various test practices. The test method covers the preparation of test sample, test conditions that are suitable for plastic and assessment of test results. The test is performed to measure the ability of plastic materials to resist deterioration of mechanical, electrical, optical and other related properties that are caused by the exposure of plastic materials to water, heat, and light which are important for many applications.
The test helps to analyze various changes in properties related with end-use conditions, including the effects of moisture, solar ultraviolet irradiance, heat, and humidity.
Significance
ASTM D4329-13 enables packaging, automotive, construction, and consumer product manufacturers to accelerate and standardise UV durability assessment — supporting material qualification, comparative supplier evaluation, formulation development, and product lifetime prediction before field deployment. Consistent application of defined exposure cycles ensures that weathering test results remain reproducible and comparable across laboratories and test programmes.
Scope
ASTM D4329-13 covers four defined exposure cycles combining fluorescent UV irradiance at specified wavelength and intensity levels with controlled condensation or water exposure periods, applicable to plastic materials requiring accelerated outdoor weathering simulation under laboratory conditions.
