Maximum Pore Size

Maximum pore size refers to the largest through-pore in a porous medium, typically determined by bubble-point testing. It represents the weakest point of retention and defines the risk of particle breakthrough. While most flow passes through smaller pores, the maximum pore dictates absolute rating and integrity under differential pressure. For critical processes, each production lot is tested for bubble point at specified wetting liquids and temperatures. Consistency of maximum pore size ensures that retention performance meets validation criteria, especially in sterile or precision filtration where one oversize defect can compromise product quality.