Federal job category 4300 includes trades focused on shaping, forming, and repairing items made from non-metallic, moldable materials. These roles involve working with substances like plastic, rubber, clay, wax, plaster, glass, and similar pliable materials to create or restore components used in federal equipment, facilities, or operations. Employees in this category may fabricate custom parts, cast molds, or repair damaged items using specialized tools and techniques. The work requires a solid understanding of material properties, safety procedures, and finishing methods to ensure durability and precision.

Most positions fall under the Federal Wage System and are hands-on, often located in military depots, research labs, or maintenance shops. Workers may be responsible for tasks such as forming plastic panels, repairing rubber seals, or casting replacement parts for specialized machinery. Whether supporting aerospace systems, medical equipment, or structural components, GS-4300 roles demand craftsmanship, attention to detail, and adaptability. These jobs are essential to maintaining the flexibility and functionality of federal assets.