Invar is a nickel-iron alloy that is known for its low coefficient of thermal expansion, or CTE. It is often used in watchmaking for its stability and strength, making it an ideal material for watch components. Invar is used in various components such as the balance wheel, balance spring, and escapement, greatly improving the accuracy and reliability of the watch. Invar is also highly corrosion-resistant, making it a great choice for components exposed to harsh conditions.
