There is unfortunately some misinformation in the plastics world regarding weathering, exposure, and UV-resistance. In some cases where applications go wrong, customers simply did not consider how a certain plastic might handle being exposed to certain environmental factors. One of the largest pieces of misinformation is that reprocessed-black UHMW often called “UHMW black” is UV-stable. It is not; however, and has only some limited UV-resistance due to the addition of carbon black in the resin. The following are examples of weathering and exposure concerns for some popular plastics and options to mitigate these issues.
-Brittle in cold temperatures (below -15 degrees C)
-Switch to acetal or Tuffkast
-Poor UV-resistance makes it prone to cracking with UV-exposure
-Procure a fully UV-stable grade
-Certain varieties weaken and break down in wet environments (hydrolysis)
-Work with a plastics expert to select a polyurethane variety not weakened by hydrolysis
-Poor weathering resistance, will yellow and crack with exposure
-Poor scratch resistance and tends to become cloudy with small marks when used in outdoor applications
-Request sheets with UV stable and/or scratch-resistant masking. These will be typically unstocked.
For assistance with your application please contact us today.