Clean radius and straight cuts are achievable on gasket material with the proper tooling. Thinner types of gasket material require nothing more than sharp blades and hollow gasket cutters. Gasket material
A seal is affected by compressing the gasket material and causing it to flow into the imperfections on the gasket seating surfaces so that intimate contact is made between the gasket and the gasket seating surfaces preventing the escape of the confined fluid. Basically there are four different methods that may be used either singly or in combination to achieve this unbroken barrier.