Magnesia weir plates can be used for monolithic refractories; this dataset includes the main raw materials, auxiliary materials, and energy consumption during the production process, while infrastructure such as production equipment and factory construction is excluded from the system boundary; the life cycle inventory is compiled from data obtained from multiple sources; the manufacturing process of magnesia weir plates includes raw material procurement, batching, mixing, forming, curing, sintering, cooling, quality inspection, and packaging.