A stirrer made of polypropylene (PP) is a laboratory tool used for stirring liquids or suspensions. It is made of durable, lightweight, and chemical-resistant plastic material, making it ideal for use in laboratory settings. The stirrer consists of a shaft or rod attached to a flat or cylindrical stirring element and is powered by a motor that rotates the stirring element to create a swirling motion in the liquid.

The speed of the stirring motion can be adjusted, and some stirrers may also have a timer function or a hotplate for heating the solution while it is being stirred. Polypropylene stirrers are commonly used in chemistry, biology, and pharmaceutical laboratories for mixing and homogenizing liquids, and for maintaining a constant temperature during chemical reactions. They come in various sizes and designs, ranging from small handheld stirrers to large benchtop models.