A man made fibre, Acrylic was developed by DuPont in 1944 and first used (commercialy) in 1950. Acrylic fibre is made by polymerization of acrylonitrile usually with other monomers. What would you use these fibres for? Everything from craft yarns, to concrete and stucco reinforcement, all the way to luggage and everything in between. For more info on Acrylic check out textilefabric.com