Sedimentation in Toner Formulation with PEG-7 Glyceryl Cocoate

Based on your description and tests, the sedimentation issue in your toner formulation is likely caused by the PEG-7 Glyceryl Cocoate (Coco Wash) not staying fully dissolved or dispersed in the water-based formula over time.

Regarding your current batch:

• The sedimentation indicates instability. While the staff suggested trying to blend the mixture for about 15 minutes at medium speed (500-700 rpm) to see if the sediment dissolves and becomes clear, if it doesn't dissolve after this time, it means the ingredients are not compatible enough to remain fully dissolved in this formula.
• If blending doesn't achieve clarity, you can potentially still use the toner by shaking it well before each use to redistribute the sediment. However, this is not ideal for product consistency and stability.

For future batches and formula adjustment:

• To prevent sedimentation, you need to improve the solubility or dispersion of the PEG-7 Glyceryl Cocoate in the water phase.
• Adding a solubilizer like Polysorbate 20 (Tween 20) is a common method for incorporating ingredients like PEG-7 Glyceryl Cocoate into water-based formulas and keeping them dispersed.
• You could try adding Polysorbate 20 to the PEG-7 Glyceryl Cocoate first, mixing them together (potentially warming slightly if needed, as you did with Propylene Glycol), and then slowly adding this mixture to the water phase while stirring well.
• Experiment with the ratio of PEG-7 Glyceryl Cocoate to Polysorbate 20. A starting point could be a 1:1 or 1:2 ratio (e.g., for 5% Coco Wash, try adding 5% or 10% Polysorbate 20). You'll need to test the minimum amount of Polysorbate 20 required to keep the Coco Wash dispersed and the final mixture clear or acceptably stable.
• Ensure thorough mixing during the preparation process, as suggested by the staff.