Wettable powders can be abrasive to spray nozzles.

• A. True
• B. False
• C. Sometimes
• D. Never

Answer: (A)

Wettable powders are suspensions of fine solid particles. As the spray exits the nozzle, these particles travel through and contact the inner surfaces and orifice, physically rubbing and scoring them. That abrasive action can wear down the nozzle over time, altering spray pattern and droplet size and potentially shortening nozzle life. The degree of wear depends on how abrasive the powder is (hardness and presence of gritty fillers), the concentration used, and the material of the nozzle. To limit wear, use proper filtration to remove grit, choose compatible nozzle materials (more wear-resistant options if you frequently use WP), and inspect or replace worn nozzles regularly. This is why the statement is true.