High Street Capital, a middle-market private equity firm, agreed to acquire Koch Knight, a firm that designs, manufactures, installs, and repairs custom acid-resistant linings. Financial terms were not disclosed. “Knight Material Technologies is an ideal partner for High Street Capital—they are a world-class service provider with superior products and an outstanding reputation, and that only comes from having really great people throughout the company. We anticipate supporting management’s growth plan immediately by investing in new product technologies and infrastructure to capture opportunities in the market," Matt Laffey, High Street Capital Principal.