What is the best material for construction of thru hull fittings in contact with carbon fiber hulls?

The best material for the construction of thru hull fittings in contact with carbon fiber hulls is glass reinforced plastic. This material is particularly advantageous because it minimizes galvanic corrosion risk when in contact with carbon fiber, which can create a conductive path between dissimilar metals.

When carbon fiber is used as a hull material, it can lead to potential corrosion issues if metallic fittings are used, especially if those fittings are not appropriately insulated from the hull material. Glass reinforced plastic does not have the same problems with galvanic corrosion because it is non-conductive and will not participate in an electrochemical reaction with the carbon fiber. This compatibility helps maintain the integrity of both the hull and the fittings over time, ensuring durability and reliability in marine environments.

Additionally, glass reinforced plastic fittings can be molded into complex shapes and sizes, providing flexibility in design while remaining lightweight—which is often essential in performance marine applications. Its resistance to environmental factors, such as saltwater and UV radiation, further strengthens its suitability for marine use.