Micom offers ASTM D5208 test services as part of its test offering for polymer testing. ASTM D5208 – Fluorescent Ultraviolet (UV) Exposure of Photodegradable Plastics – is based on two practices: ASTM G151 and ASTM G154. This test method gives the specific test conditions to be used with these two practices as well as instructions for sample preparation and test results evaluation.
UV exposure : uses and factors to consider:
Photodegradable plastics are intended, once they were used, to exhibit rapid loss of chemical, physical, and mechanical properties when exposed to light, heat and water. Typically, chemically reactive sites are added to the polymer chains which will facilitate polymer degradation by the following outdoor conditions: outdoor light, water and heat.
ASTM D5208 can also be used for testing insulating materials as long as they have a maximum thickness of 20 mm.
Samples will be taken before the exposure and at different time intervals. The samples will be used to measure the mechanical properties or the loss thereof. Samples should be tested as they are extracted i.e. no grouping as their mechanical properties will still evolve even if they are no longer exposed.
Typical experimental parameters:
- The number of specimens per product will vary as a function of the number of specimen required for the mechanical testing as well as the number of time intervals. A typical number of time intervals should be approximately five.
- Sample shape: testing to ASTM D5208 usually requires many samples. For efficiency reasons it is most of the time easier to expose large sheets instead of the typical 3 X 6 samples
Related test methods:
For additional test methods related to ASTM D5208 please see; Polymer testing.
We also invite you to download our PDF on the true color measurement: What is the difference between the “true” color of an item and its “perceived” color (by the human eye)?
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