Vandal resistant, superior clarity—Micro Optics have become the best and lasting solution in the industry.

KEY PUBLISHED PROPERTIES OF SILICONE 

• Rated for long‐term temperature use at 150°C, PMMA is 90°C

• Transmission properties unchanged due to UV and thermal aging > 4,500 hrs. at 65°C

• Reflection properties unchanged > 10,000 hrs. at 150°C

• No discoloring due to thermal aging after 6,000 hrs. at 130°C • Better chemical resistance over PMMA

• Some mechanical properties were degraded after 10,000 hrs. at 150°C but these were not seen as an issue since these were beyond the scope of actual in‐service usage

• Shore A hardness increased by approximately 8%. Since the conformability of the silicone affects the sealing of the optical assembly IP‐67 capability after thermal aging should be verified.

VS.

PMMA PROPERTIES

• Temperature limit of 90°C

• Immediate change transmission properties due to UV & thermal aging

• Major yellowing due to thermal aging after 6,000 hrs. at 65°C

• Poor chemical resistance compared to Silicone

• Hardness decreases—gets significantly brittle