[KateLowen]

Thanks @MarkBroussard - so do you think the ethylhexylglycerin is the problem? In your experience is phenylpropanol compatible with most raw materials (e.g., essential oils)? Also, wondering if you have any comments on formulation techniques - it is listed as insoluble in water on the label (purchased from Making Cosmetics) which is why I have tried incorporating it in the surfactants first. Thanks again for your input!

[KateLowen]

Thanks for the follow up @Belassi - I’m trying to better equip my lab and was considering an overhead mixer and homogenizer for both emulsions and surfactant-based products. Any other suggestions? So far, still making pretty small batches, up to 2 gallons.

[KateLowen]

One more thing - could using an immersion blender instead of an overhead mixer affect formula stability?

[KateLowen]

Thanks so much for the reply @chemicalmatt. I had come across the recommendation to add the surfactants in the order you mention when using cationic guar, however, I also have a tough time melting the SCI without the help of the CAPB. Maybe I’ll try just adding the surfactants to the water phase (in the correct order) and heat the entire mix to melt the SCI.

Interesting about the pH - wondering if leaving the pH at around 7 will impact viscosity? Lowering the pH has helped with thickening in this formula. I’d not come across the information regarding glycerin affecting viscosity/foam before, but will try lowering the amount.

Will report back on the next experiment!