Modern society is the so-called information society. Electric equipment like computers, cell phones, and flat-panel televisions are daily essential products in our lives nowadays. Ajinomoto Fine-Techno provides electronic materials used for such equipment. The technical progress of semi-conductors helped quickly make electronics equipment smaller and more precise; high-performance insulating materials are essential to mount these semi-conductors in manufacturing of high-density printed circuit boards. “Ajinomoto Build-up Film”（ABF）, an insulating film for printed circuit boards we developed for the first time in the world, is highly appreciated as an epochmaking product with its flexibility toward the progress of semi-conductors. It is applied for personal computers all over the world and established the position as a de facto standard.