First U.S. Commercial Nytril Fiber Production: Nytril fibers were produced commercially in the United States during the 1950's and 1960's. There are no current U.S. producers.
Federal Trade Commission Definition for Nytril Fiber: A manufactured fiber containing at least 85% of a long-chain polymer of vinylidene dinitrile, (CH2C[CN]2-)X, where the vinylidene dinitrile content is no less than every other unit in the polymer chain. (Complete FTC Fiber Rules here.)
Nytril Fiber Characteristics and Uses — Nytril fibers are soft and resilient. As with modacrylic fibers, they soften at somewhat lower temperatures than acrylic fibers and are therefore most commonly used in articles that do not require pressing. Nytril fibers can be used in sweaters, pile fabrics, and in blends with wool where they contribute to shrink resistance and shape retention. They have also been used in a variety of “fake fur” applications.