GOHARTAB SPINNING CO. is one of the biggest textile factories in Iran. Acrylic fibres are synthetic fibres made from a poly acrylonitrile. To be called acrylic the polymer must contain at least 85% acrylonitrile monomer. Dupont created the first acrylic fibres in 1941 and trademarked them under the name Orlon. As it resembles silk, it is also called artificial silk.