What feature was added in the fifth generation of nylon fiber development for improving stain resistance?

The feature that was added in the fifth generation of nylon fiber development to improve stain resistance is the stain blocker treatment. This advancement involves applying a chemical treatment to the nylon fibers that creates a protective barrier against spills and stains. By altering the surface properties of the fibers, it helps to prevent liquids from being absorbed into the carpet, making it easier to clean up accidents and maintain the appearance of the carpet over time. This innovation significantly enhances the durability and cleanliness of carpets made from nylon, catering to the needs of consumers seeking low-maintenance flooring options.

Other options may refer to useful features in different contexts, but they do not specifically address the enhancement of stain resistance provided by the fifth-generation nylon fibers. For instance, waterproof coatings can protect against liquid penetration but do not typically focus on stains specifically. A carbon core may contribute to other properties such as strength or dimensional stability, while UV protection is relevant for color retention but does not directly influence stain resistance. Thus, the stain blocker treatment is uniquely tailored to tackle the issue of stains effectively.