Which component of an emulsifiable concentrate can cause pump parts to deteriorate?

• A. Water
• B. Solvents in the formulation
• C. Pesticide active ingredient
• D. Detergent

Answer: (B)

The part of an emulsifiable concentrate that can cause pump parts to deteriorate is the solvent carried in the formulation. These solvents—usually petroleum-based liquids—are powerful dissolving agents designed to keep the active ingredient in solution and to help the mix emulsify with water. When you use an EC in a sprayer, those solvents contact seals, gaskets, hoses, and other rubber or plastic components. Over time, they can soften, swell, or chemically attack those materials, leading to leaks or parts failure. Water and the active ingredient themselves aren’t the primary culprits for hardware deterioration, and while detergents can affect cleaning or residue, the solvent’s aggressive nature is the main risk to pump components. So, the solvents in the formulation are the key factor behind pump deterioration.