A specialist in sintered porous plastic components for medical device applications makes sintered self-sealing porous media capable of blocking a broad range of polar organic solvents and acidic solutions. These porous self-sealing media have high gas permeability and good bacterial filtration capability. Additionally, the media can be manufactured with an indicator that will change color upon exposure to a liquid. They are offered to help support the prevention of contamination and infection, especially in fluid-management applications.