Since the advent of Invar alloy for more than 1 years, the application fields with its low expansion coefficient have expanded rapidly. Precision instruments and meters, pendulum rods of standard clocks, balance wheels and hairsprings of clocks and watches made of Invar alloy became the most important products in the early days. In the 192s, Invar alloy was used as the lead wire for glass sealing instead of platinum, which greatly reduced the cost. In 195s and 196s, the application of Invar alloy continued to expand, mainly used in radio tubes, thermostats, hot bimetals for temperature control, length scales, geodetic baseline scales, etc. In the 198s and 199s, it was widely used in microwave technology, liquid gas storage containers, shadow mask steel belts of color TVs, core materials of overhead power transmission lines, vibrating cavities, laser collimator cavities, and three-step repetitive lithography camera substrates. After entering the 21st century, with the rapid development of space technology, new applications also include being used as structural parts in space remote sensors, precision lasers, optical measurement systems and waveguides, supporting systems for giant lenses in microscopes and astronomical telescopes, and various scientific instruments that need to be equipped with lenses.
In a word, with the constant application of Invar alloy in satellites, lasers, ring laser gyroscopes and other advanced high-tech products, it strongly shows that these ancient materials are helping modern science to advance to a higher level.