Coedited by one of the world’s leading authorities in the field and the late W.E. Morton, this classic book explores key aspects of fiber performance. Cementing its reputation as an invaluable reference, this fourth edition has been substantially reorganized and revised to reflect new research directions. After introductory chapters on fiber structure, testing, and sampling, the book reviews key fiber properties, their technical significance, factors affecting these properties, and measurement issues. It examines fineness, length, density, thermal properties, and reaction to moisture. The book also considers tensile properties, thermomechanical responses, and fiber breakage and fatigue. It concludes with discussions on dielectric properties, electrical resistance and static, optical properties, and fiber friction. Each chapter covers both natural and synthetic fibers, including high-performance fibers.