For over 300 years, engineers struggled to roll steel thinner than paper without distortion. Traditional compression-based rolling couldn’t achieve uniformity, limiting the use of ultra-thin metals in advanced technologies. ESAR-μFoil STS breaks that boundary. Using a proprietary Equal - Speed Asymmetric Rolling (ESAR) method that utilizes controlled shear deformation, it produces the world’s first 10μm stainless foil with exceptional internal consistency and strength. This breakthrough enables transformative applications from ultra-safe, high-energy solid-state batteries to ultra-compact medical sensors and highly precise semiconductor fabrication tools. More than a material, ESAR - μFoil is a foundational platform: a flexible, durable metal canvas enabling next-generation engineering. It doesn’t just improve components. It makes new categories of products possible. By solving a centuries-old constraint, it redefines what stainless steel can do in the fields of energy storage, bio-health, and nano-manufacturing.