Hydrophobic resistance is measured by how easily a liquid beads up and easily rolls off. A surface is deemed “hydrophobic” at a contact angle of 90 degrees. The coating on Siemens

BTE and RITE devices repels moisture at 130°— going a step further to ensure moisture doesn’t enter where it’s not wanted.

The coating surface is also highly resilient. After being immersed in a mildly acidic solution for a period of one week, it retained its water and oil resistant properties.