When a product formula moves from the experimental stage in the laboratory to batch production, the process engineer adds ingredients at the levels specified in the formula. For most ingredients, there is an agreed standard tolerance of 2% deviation from the specified level. This is the default tolerance assigned by Formulation Design. If an ingredient is closely monitored for regulatory or performance reasons, you can assign it a lower weight-critical tolerance of 0.5% in its Properties tab. If an ingredient has a non-standard level tolerance, you can define its level as adjustable. An adjustable ingredient has absolute minimum and maximum percentage wet weight levels. You can specify the minimum and maximum levels to be any values, provided that the ingredient's level as specified in the formula lies between them. A formula containing adjustable ingredients must also include at least one QS ingredient. An adjustable ingredient cannot be a QS ingredient. To define an ingredient to be adjustable, select Adjustable in the Set Wet (%) Tolerance options in the ingredient's properties. In the Min % (w/w) field, enter the minimum acceptable percent value. In the Max % (w/w) field, enter the maximum acceptable percent value. For more information about ingredient weight properties, see Ingredient Properties: Weights. You can view the minimum and maximum levels for ingredients in the formula grid by adding the Min % (w/w) amd Max % (w/w) columns to the grid. For instructions on managing columns in the formula grid, see Adding, Moving, and Deleting Columns. "After you set maximum and minimum values for the adjustable ingredient, if you enter a Wet % or Wet Wt value that is outside those parameters, the Min % (w/w) or Max % (w/w) value is highlighted in pink.
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