7. Mixing plans

7.1 General

The factors used to study mixture designs are the proportions of the mixture's constituents . But these components are not independent of each other. The sum of the proportions of a mixture is always 100%. The percentage of the last constituent is imposed by the sum of the percentages of the first compounds. For this reason, blend designs are treated separately.

Mix designs are also characterized by a number of constraints that can influence the choice of constituent proportions. For example, the concentration of a product must be at least x percent,...