Practice for Fluorescent UV Exposure of Plastics

This practice covers specific procedures and test conditions for fluorescent UV exposure of plastics, including the preparation of test specimens and the evaluation of test results. The procedures are intended to induce property changes in the plastics 

The practice recommends to use the spectral power distribution of the fluorescent UV lamp similar to that of UVA-340 fluorescent lamps. 

Note of the author Fluorescent lamps UVA-340 spectrally match rather well the sunlight between 295 and 340 nm. However, in the visible part of the spectrum, the irradiance of sunlight generally increases from 340 to 400 mn (from 0.6 to 1.2 W/mVmn, respectively), while UVA-340 lamps produce irradiance which decreases in the same range of wavelength from 0.6 to 0.1 W/mVnm. 

The procedure recommends to employ Cycle A for most general application, and Cycle C for plastic building products  

8 h UV at black panel temperature of 60 3°C 4 h water spray at black panel temperature of 50 + 3°C 

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ASTM D 4329 [221] Standard Practice for Fluorescent UV Exposure of Plastics... 

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