Profile: Advanced Sealing Technology manufactures a complete line of cartridge and component mechanical seals for process pumps. We offer AST 70 single cartridge seal for harsh applications. The AST 80 dual cartridge seal incorporates liquid shear pumping to remove heat from the seal faces, and operated with a pressurized barrier or non-pressurized buffer fluid system. Our seals are field-rebuildable, giving control over schedule and budget. The AST 40 seal provides positive sealing for bearings in process equipment.