KEIWA Incorporated manufactures and sells optical films in Japan, Vietnam, Germany, and the United States. Its product lineup includes composite diffusion plates, diffusion films, advanced functional films, process films, and agricultural films, along with processing paper, packaging materials, and clean energy materials. The company was formerly known as KEIWA Commerce and Industry Co., Ltd. and changed its name to KEIWA Incorporated in 1999. Incorporated in 1948, it is headquartered in Tokyo, Japan.