Which liquid pesticide formulation contains solid particles that do not dissolve in either water or oil and may contribute to abrasive wear of nozzles and pumps?

• A. Flowables (F) or Liquids (L)
• B. Suspensions (S)
• C. Emulsifiable concentrates (EC)
• D. Solutions (Sol)

Answer: (A)

Solid particles that don’t dissolve in water or oil create abrasive wear when they are carried through spray equipment. Flowables (F) or Liquids (L) are formulated as these kinds of suspensions: finely divided solids dispersed in a liquid carrier. Because the particles remain undissolved in the carrier, they can pass through pumps and nozzle orifices and abrade metal surfaces, leading to faster wear and maintenance needs. This is why flowable/liquid formulations are associated with potential abrasive wear of nozzles and pumps. In contrast, solutions have ingredients dissolved and don’t contain insoluble particles; emulsifiable concentrates form emulsions after dilution and involve dissolved components rather than solid particulates; suspensions also have undissolved solids, but the flowable category specifically highlights the particulate abrasive effect in typical use.