There are two types of man-made fibres:
chemical-based ones e.g. polyamide (PA), polyacrylamide (PAC), spandex, lycra, polyester (PES) etc. cellulose-based ones e.g. viscose (CV), lyocell, modal, cupro, acetate etc. These are extremely sensitive to friction and oxygen-based bleaching agents. They also have a reduced wet tensile strength, which is why the Dr. Beckmann Office & Hobby Stain Expert cannot be applied to these fibres. All types of man-made fibres are synthetically manufactured.