When two pesticides mix together and separate into layers, this is known as?

• A. Limited agitation
• B. Physical incompatibility
• C. Chemical incompatibility
• D. Thermal incompatibility

Answer: (B)

Physical incompatibility describes a tank mix that won’t stay uniformly mixed; the two pesticides separate into distinct layers. This happens when their formulations aren’t chemically and physically compatible in the same spray solution, so emulsions or suspensions break and the components stratify due to differences in solubility, density, or surfactant compatibility. It’s not about a chemical reaction degrading something (that would be chemical incompatibility), and it isn’t simply a matter of needing more agitation or temperature effects (those describe other instability issues). The key sign is visible layering after mixing, indicating the two products won’t form a stable combined solution.