Sea salt texture spray formula instability


Tricks for addressing instability caused presumably by high salt content in a sea salt texture spray hair product formula? The emulsifiers used in the formula are Polysorbate 20 and Peg 40 hydrogenated castor oil. The product is entirely emulsified upon bottling but slowly falls out of stability over the span of about a week, and creates little floaties that create a ring near the fill line and then floaties throughout. Not sure of the actual term for these floaties, perhaps flocculation or something of that sort? Photo attached to show this. Ingredients list: water, aloe leaf juice, sea salt, Epsom salt, glycerin, witch hazel, peg 40 hydrogenated castor oil, Polysorbate 20, eucalyptus essential oil, fragrance oil, optithen plus. As you can see really not much oil content so I’m under the assumption that it must be the salt content perhaps but unsure of how to address this. The performance of the product is great so I’d like to make changes that wouldn’t change it too drastically but unsure of what might help. I’ve adjusted many factors in trying to correct it, the most successful thus far was a batch where I decreased the peg 40 a touch and increased Polysorbate in place of that amount, and decreased salts by almost 2% 

Comments

  • PharmaPharma Member, Pharmacist
    Epsom salt is worse than sea salt in breaking emulsions. How does it perform without any sea & Epsom salt?
    It's probably the EO emulsion droplets floating up. If the particles don't fuse (the emulsion/micelles hold), a gelling agent might resolve flotation.
  • Pharma said:
    Epsom salt is worse than sea salt in breaking emulsions. How does it perform without any sea & Epsom salt?
    It's probably the EO emulsion droplets floating up. If the particles don't fuse (the emulsion/micelles hold), a gelling agent might resolve flotation.
    I haven’t tried batches without the salts but my guess would be that they wouldn’t have the issue. The floaters are actually a sort of gelatinous solid that forms, almost like a breakdown of some of the materials over time more so than even just separation. 
  • Can you provide % inclusion levels for your materials? It's hard to diagnose otherwise
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