Métaux Spéciaux (MSSA) is a French chemical manufacturer specializing in sodium chemistry. The company develops and produces sodium metal and a range of sodium-based reagents and intermediates for industrial use.
Its portfolio includes sodium metal, sodium alkoxides such as sodium methylate and ethylate, sodium–potassium alloy (NaK), and sodium dispersions. These products serve applications in biodiesel production, pharmaceuticals, fine and specialty chemicals, and materials synthesis. MSSA supplies customers in Europe and internationally and focuses on the safe handling, packaging, and logistics of highly reactive alkali-metal products.