DuPont Teijin Films (DTF) is the world's premier producer of PET and PEN polyester films. The group specializes in film products and related services for the specialty, industrial, packaging and electronics markets. brand names include Mylar®, Melinex® and Teijin® Tetoron® PET polyester films and Teonex® PEN polyester film. DTF films are used in packaging, safety glasses, digital imaging and printing, labels, electronics and electricals and the automotive trade. DuPont Tejin Films is a 50/50 joint venture between DuPont and Teijin.