Welcome to the Structural Composites of Indiana website. Structural Composites of Indiana has over 50,000 square feet of manufacturing space and over 100 years' combined experience in the design, development, and production of custom fiberglass products for the marine, industrial, recreational, transportation, agricultural, corrosion, military, and rail industries. From design concept to production, Structural Composites of Indiana can meet or exceed the requirements of our customers with a need for custom fiberglass fabrication.