A long stem funnel made of polypropylene (PP) is a laboratory apparatus used for transferring liquids into containers with small openings. The long stem allows for greater control during pouring and helps to prevent spillages. PP is a popular material for funnels as it is durable, lightweight, and resistant to chemicals commonly used in the laboratory.

Additionally, polypropylene is chemically resistant and can be used with a wide range of liquids without risk of contamination or corrosion.