Suspensions have been established for many years, but still present the formulation chemist with considerable challenges in order to achieve a satisfactory product. Despite being inherently unstable in the colloidal sense, SC formulations have to show good physical and chemical stability for prolonged periods over a wide range of temperatures, in a variety of pack types and sizes. Needless to say, biological efficacy must also be maintained over this time.
Resource requirements in developing a satisfactory product are often considerable.
This paper will go through typical procedures used in the development of suspension concentrates, from preliminary research through to development formulations likely to lead to potential sales products. Physical testing procedures will be described, including techniques used for monitoring stability and helping to predict long term shelf stability.