SII INC

Capabilities

SII, Inc. is a mission-critical defense contractor with over two decades of unmatched performance in the engineering and production of specialized polymer materials. We serve as a vital link in the U.S. Navy’s submarine supply chain, providing the acoustic damping and structural reliability essential for sub-surface superiority. As we enter our next phase of growth, SII is realigning its operations to scale alongside the Navy’s increased procurement tempo, ensuring that our proprietary technology continues to define the standard for silent operations. In an era of increasing undersea competition, acoustic superiority is the primary determinant of survivability. SII, Inc. provides the United States Navy and its Tier 1 partners with the specialized material science required to maintain a stealth advantage in contested waters.