Emulsions

Micro-Emulsion

An attractive alternative to emulsion concentrates due to its thermodynamic stability of the system which means it does not separate in storage. They are easy to handle as they tend to have a low viscosity. They are effective for many crop protection products due to the formulation process making the active ingredient more soluble. A mixture of anionic and non-ionic surfactants is usually used to make a successful system. The advantages or micro-emulsions are their low flammability. They offer very good application characteristics and due to high solubility can sometimes achieve a degree of bio-enhancement.

Suspo-Emulsion

A suspemulsion formulation is essentially a mixture of a suspension concentrate with an oil-in-water emulsion. Ideal formulation for a combination of active ingredients when one active ingredient is a solid and the other active ingredient is a liquid. They are becoming ever more popular because of their convenience of use and the breadth of possible applications. The development of suspo-emulsions needs careful consideration at the formulation stage as the correct balance of dispersing and emulsifying agents need to be added to the suspension concentrate and the oil-in-water emulsion to ensure stability and avoid problems such as heteroflocculation. Advantages in the use of suspo-emulsions include; the absence of VOC’s, a ready-mixed formulation which is easy to measure and pour and they avoid tank mix compatibility issues.

EW – Emulsion, oil in water EO – Emulsion, water in oil

Emulsion formulations can be either oil-in-water (EW) or water-in-oil (EO). Oil-in-water emulsions are becoming increasingly available alternatives to emulsifiable concentrates because of the need to reduce volatile organic solvents. To ensure efficacy and stability, the emulsion is added to a mixture of surfactant stabilizers and emulsifiers which prevent flocculation, coalescence and creaming of the emulsion droplets. The process of formulation results in very fine particles of a stable size. EW formulations have the advantage of low flammability, safety of use and are non-phytotoxic.