Which of the following materials is not commonly used for spray nozzles?

The selection of materials for spray nozzles is critical, as they must be durable and capable of withstanding various environmental conditions. Nickel is not commonly used for spray nozzles due to its cost and properties that may not offer significant advantages over more commonly used materials.

Plastic is frequently utilized because it is lightweight, cost-effective, and can be molded into various shapes, making it ideal for producing nozzles in diverse applications. Aluminum is also a popular choice, known for its good strength-to-weight ratio and resistance to corrosion, which are essential for the longevity of spray nozzles. Copper, while less common than plastic and aluminum, is sometimes used because of its excellent thermal conductivity, though it may not be as resistant to corrosion over time.

Overall, while all materials have their characteristics, nickel's limitations compared to others in terms of practicality and expense contribute to its lesser use in manufacturing spray nozzles.