Acrylic yarn is a fiber that is man-made. It is developed from polymers that are synthesized from petroleum products. There are many benefits to using acrylic yarn. Looking into its properties and applications will help you decide whether you should go ahead with this yarn for your knitting project or not. Acrylic yarns were first developed by DuPont during the 1940s. Within a decade, these yarns became a rage and were being produced on a massive scale. These polymers are created from several processes that produce string-like strands that resemble wool hair. These are then spun into a yarn.