Water sealing - the closed cell structure allows for good water sealing with relatively low compressive forces.

Compression set resistance - Silicone offers excellent compression set resistance (ability to rebound to original thickness), especially at higher temperatures, compared to most rubber material. Low compression set silicone sponges are available for even better performance than general purpose grades.

UV and ozone resistance - Silicone products have excellent UV and ozone resistance due in part to their inorganic backbone. This provides long term performance.