Performance Polymers Innovations (PPI) Inc. - Railseal and Custom Extruded Rubber Profiles Manufacturer - Home PPI manufactures Railseal, extruded rubber products for industrial and indoor rail grade crossings, including concrete panel and tub crossings, as well as a wide range of other customized and specialized rubber profiles. PPI’s product line includes a wide selection of rubber snow plow blades and edges, custom rubber fenders and bumpers for marine and industrial applications, electrically non-conductive Railseal and isolation seats and mounts, in addition to the capability to work with customers to design custom rubber extrusions using the latest rubber formulations that meet or exceed design specifications.