This book is about materials in fibrous form, precisely what the title says. Perhaps the only thing that needs to be emphasized is that the materials aspects of fibers are highlighted. The main focus is on the triad of processing, microstructure, and properties of materials in a fibrous form. I have kept the mathematics to the bare minimum necessary. More emphasis is placed on physical and chemical insights. Although all kinds of fibers are touched upon, there is a distinct tilt toward synthetic, nonapparel-type fibers. This is understandable inasmuch as the second half of the twentieth century has seen tremendous research and development activity in this area of high performance fibers, mainly for use as a reinforcement in a variety of matrix materials.

The field of fibrous materials is indeed very vast. To compress all the information available in a reasonable amount of space is a daunting task. My aim in writing this text has been to provide a broad coverage of the field that would make the text suitable for anyone generally interested in fibrous materials. I have provided ample references to the original literature and review articles to direct the reader with a special interest in any particular area.

The plan of the book is as follows. After an introductory chapter, some general terms and attributes regarding fibers and products thereof are described in Chapter 2.