Which is a disadvantage of an emulsifiable concentrate?

• A. Inhalation hazards are high, especially when pouring and mixing
• B. Solvents in the formulation may cause pump parts to deteriorate
• C. It tends to clog nozzles and screens in sprayer equipment
• D. Specialized equipment is needed to apply EC products

Answer: (B)

Emulsifiable concentrates use organic solvents to dissolve the active ingredient so the product can form an emulsion when mixed with water. Those solvents can attack and soften or dissolve pump seals, hoses, and other rubber or plastic parts inside the sprayer. Over time, this solvent exposure wears down equipment, leading to leaks or pump failure, which is the core drawback you’re weighing with EC formulations.

Other options are less central to ECs: inhalation hazards can be a factor with many solvent-based products during pouring or mixing, but it’s not as specific a drawback as equipment damage. Nozzle and screen clogging isn’t a primary issue for ECs, since they’re liquids designed to pass through standard spray systems, and specialized equipment isn’t usually required.