Hot-dip are a type of flange that has undergone a hot-dip galvanizing process to provide protection against corrosion. The hot-dip galvanizing process involves immersing the flange in a bath of molten zinc, which creates a metallurgical bond between the zinc coating and the flange’s surface. This zinc coating acts as a sacrificial barrier, protecting the underlying steel from rust and corrosion, making it ideal for use in outdoor and corrosive environments.