ASTM D4329 tests fluorescent UV exposure of plastics. It covers specific procedures and test conditions based on practices ASTM G151 as well as ASTM G154.  This test method also covers the preparation of test specimens, the test conditions best suited for plastics, and the evaluation of test results. 

ASTM D4329 use

Polymers can have their mechanical, electrical and optical properties significantly altered when exposed under outdoor conditions such as light, heat and water. This method is intended to prompt property changes associated with end-use conditions, including the effects of daylight, moisture in addition to heat. The simulation of the deterioration provoked by localized weather, such as, atmospheric pollution, biological attack, and saltwater exposure is not intended by the exposure used in this practice. For a combination of fluorescent light exposure and salt water, you should consider ASTM D5894.

ASTM D4329, ASTM G154 Accelerated Weathering by Flurorescent UV Lamp Exposure, nonmetallic materials

Typical Experimental parameters for ASTM D4329 testing

Number of specimens/products: At least three replicate specimens.

Size and shape: Will be determined by the specifications of the test method used to gauge the effects of the exposure on the samples. It is advised that specimen be sized to fit specimen holders, when possible. For specimens made of insulating materials, for instance foams, maximum thickness is 20 mm to allow proper heat transfer for condensation.

The irradiance level in W/(m2nm): To be specified, but typically from 0,49 to 1,55 W/(m2nm).

Lamp type: UVB-313 and UVA-340 (most common)

Exposure duration: To be specified

Exposure cycle:

Cycle A (general use)

Cycle B (automotive use)

Cycle C (polymer building products)