QEC is a converter of Mylar film. Mylar is a registered trademark of DuPont Teijin Films. Our management team and staff have over 100 years of industry experience! Quality Edge Converting is the world's leading supplier of Index Tabbing, Edge Reinforcing, and Specialty Process films and tapes. With manufacturing facilities in the U.S. And Canada, and now distribution in the UK, QEC can provide all your specialty.