Plastic comes in many varieties, with unique properties. Polypropylene and polystyrene are most commonly used. Used in almost every kind of broom and brush application. A common synthetic filament used in a variety of applications.
Polypropylene is lower cost than nylon and it is fungus resistant. It does not have the “bend recovery” that nylon has or nylon’s abrasion resistance. Polypropylene has excellent stiffness when wet and is inert to most solvents, oils, acids or chemicals and is fungus resistant.