Select DOE > Classical > Mixture Design.
Click Continue.
Click Linear Constraints
Enter 0.7 in the X1 box, 1 in the X3 box, change the direction of the inequality to and enter 0.4 in the constraint box.
This constrains 0.7X1+X3 to at least 40% of the mixture.
Click Space Filling.
Click Make Table.
From the design table, select Graph >Ternary Plot.
Select X1, X2, and X3 and click X, Plotting, and then click OK.
Space Filling Design with One Linear Constraint
The final design points can be obtained by using the default MaxPro (maximum projection) optimality criterion or by selecting the Centroid criterion. You can find these options under FFF Optimality Criterion in the report’s red triangle menu. MaxPro
For p factors and n equal to the specified Number of Runs, the MaxPro criterion strives to find points in the clusters that minimize the following criterion:
Note: You can set a preference to always use a given optimality criterion. Select File > Preferences > Platforms > DOE. Select FFF Optimality Criterion and select your preferred criterion.
The design region can be restricted by selecting the Linear Constraint option in the Linear Constraints outline.

Help created on 9/19/2017