Which is a disadvantage of both EC and ULV formulations?

• A. Difficult to handle, transport, and store.
• B. Require constant agitation to keep in suspension.
• C. They are odorless and easy to handle.
• D. Solvents may cause deterioration of rubber or plastic hoses, gaskets, pump parts, and other surfaces.

Answer: (D)

Formulations that are EC and ULV rely on solvents to carry the active ingredient. That solvent content can attack the materials used in spray equipment—rubber or plastic hoses, gaskets, pump parts, and other surfaces—causing swelling, softening, cracking, leaks, or faster wear. Because of this, equipment compatibility becomes a major concern: you may need seals and components made from resistant materials (like Viton or Teflon), more frequent maintenance, and thorough flushing and cleaning after use, or even dedicated gear for these formulations. The issue isn’t typically about being hard to handle or store in general, and these products aren’t universally odorless or easy to handle; the real standout drawback you must manage is the potential damage to equipment surfaces from the solvents.