What is the correct flange surface finish?

Flange surface finish is a critical aspect of gasket performance. Metallic, semi-metallic and nonmetallic gasket materials interact with flange surfaces differently. Each of these gasket types require specific ranges of surface finish for optimum gasket performance with lowest leakage. Metallic gaskets require a smoother flange finish than either semi-metallic or nonmetallic. Please consult with our technical department to determine the best combination of flange surface finish, gasket design and gasket material(s) for all your projects.