FIBER TESTING AND PROPERTIES Fiber testing and material properties is essential in the textile and interior design industries. Fiber performance affects durability, comfort, cost, and sustainability. Through reviewing selected videos on cotton testing, long staple cotton, rayon production, and technical polyester, I gained a deeper understanding of how fibers are evaluated and engineered for specific uses. The cotton testing video provided an understanding into the scientific methods used to evaluate cotton quality before it enters textile production. A primary instrument discussed was the High-Volume Instrument, which measures multiple fiber characteristics quickly and accurately. These characteristics include fiber length, strength, micronaire, uniformity, and color grade. One of the most important takeaways was the significance of fiber length and strength. Longer fibers create smoother yarns because they twist together more securely, resulting in fewer protruding ends...