Foam Tape Science
They work by being compressible and elastometric. Their closed air-structure is resistant to air, vapour, moisture, dirt, and sound penetration and as they are dimensionally stable, they won’t ooze or run. When compressed, the cell walls maintain a memory of their natural state, and apply an outward pressure that seals the joint. They also ensure a positive seal against irregular surfaces and are very resilient and are excellent option if your require long term performance sealant on a very demanding application.