5E Advanced Materials Signs IOI for 3,750 Tons of Boric Acid and Calcium Sulphate

5E Advanced Materials announced it has signed an indication of interest with a domestic industrial end-user for the purchase of boric acid and calcium sulphate products from the Company's Fort Cady Integrated Boron Facility. This marks the Company's second commercial milestone in two months, further demonstrating growing customer demand. The IOI outlines the preliminary interest of a U.S.-based industrial customer in purchasing boric acid and calcium sulphate products from 5E, contemplating a 5-year term with an annual minimum offtake volume of approximately 3,750 short tons of boric acid and calcium sulphate and a maximum offtake volume of approximately 4,500 short tons of both products, at a fixed price subject to an annual escalation. The arrangement is subject to satisfactory evaluation of product quality and specifications, evidence of consistent production capability, and the negotiation and execution of a definitive purchase agreement. The IOI follows the first offtake heads of agreement, a 10-year term agreement with a domestic industrial customer, announced in May 2026, and reflects ongoing momentum from 5E's customer engagement efforts across multiple industrial end markets. 5E continues to advance discussions with this and other prospective customers, with the goal of converting non-binding indications of interest and heads of agreement into definitive, binding offtake agreements that support the Fort Cady Project's path toward a Final Investment Decision.