With low use rate insecticides and fungicides as seed coatings it is important to form a continuous coating over the seed surface by optimum addition of polymer and/or solid diluent. Use of the experimental design associated with blending allows the formulator to identify this precise composition and provides a framework for comparing the performance of alternative emulsion polymers and diluent solids.

Built-in seed coating formulations of low use rate insecticides and fungicides, developed by the addition of 520 %w/w emulsion polymer, demonstrate comparable abrasion resistance to the suspension concentrate itself.