This bill, known as the Strengthening Essential Manufacturing and Industrial Investment Act, expands the existing advanced manufacturing investment tax credit. It specifically broadens the definition of an "advanced manufacturing facility" to include those primarily engaged in the manufacturing of semiconductor materials , in addition to semiconductors and semiconductor manufacturing equipment. This expansion aims to incentivize investment in the production of critical components and consumables necessary for semiconductor fabrication. The legislation meticulously defines semiconductor materials , categorizing them into "direct production materials" that are physically incorporated into a finished semiconductor, such as substrates and thin films, and "indirect production materials" that are integral to the manufacturing process but not physically incorporated, like process chemicals and photolithography materials. It also mandates the Secretary, in consultation with the Secretary of Commerce, to annually publish a list of qualifying materials and establish a petition process for new materials. This comprehensive approach seeks to bolster the domestic supply chain for semiconductor manufacturing by supporting a wider range of essential inputs.