Modacrylic is the generic name of a fiber that has a lower Acrylonitrile (35-85%) level than ordinary acrylic fiber in its make up. Protex is the advanced FR fiber in the Kanecaron family. Based on the original characteristic of Kanecaron, both FR and heat resistance is improved which allows blends with other flammable fibers, such as, cotton or polyester while keeping a high level of FR performance.