There are many types of nozzles available to provide differences in throughput, spray angle, and pattern. Spray nozzles are made from a variety of materials including brass, aluminum, stainless steel, hardened stainless steel, ceramic, and nylon. Brass nozzle tips are common because they are relatively inexpensive but they wear rapidly when used to apply abrasive materials such as wettable powders. They are also susceptible to corrosion by some liquid fertilizers. Aluminum tips are resistant to moderately abrasive materials.
Nylon or plastic tips are sometimes more resistant to wear than metal tips because molded tips have a smoother finish. The surface of a metal tip (especially brass and aluminum tips) has microscopic grooves as a result of machining and drilling the orifice. This rough finish presumably causes turbulence and enhances the abrasive action of particles suspended in a spray liquid. There are, however, disadvantages to nylon or plastic nozzles. The threads of some nozzle bodies and caps may be easily damaged by constant use, especially if they are over-tightened. They are also subject to swelling when exposed to some solvents.