HJ3 Composite Technologies LLC manufactures, engineers, and installs composite systems to strengthen the corroding and degrading infrastructures. The firm has has designed its structural strengthening and repair systems to serve commercial, industrial, residential markets and markets in need of blast protection under its HJ3 Civil, CarbonSeal, StrongHold and BlastSeal product lines. In addition to commercial products, the company offers engineering services and testing of infastructures.