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Viscosity difference between carbopol 940 & Sepimax Zen
Is there a large viscosity difference between the two at 0.3 and 0.4% concentrations?
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2 Replies
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There sure is. Carbopol 940 will yield a higher viscosity at 1%w/w than Seppimax ZEN. The latter is useful for its electrolytic stability, of which Carbopols have zilch.
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I’m really struggling to come up with a robust preservative system for the carbopol 940. I do not know if Euxyl PE 9010 will be enough and I do not want added glyceryl caprylate to possibly hydrolyse at pH 7. Are you comfortable making a carbopol 940 emulsion-face cream with pH 6 or do you think the purpose for using the carbopol is being defeated? With Sepimax Zen, it seems like I could use sodium benzoate or potassium sorbate in addition to the phenoxy.+EHG and have a well-preserved face-cream. What is your thought process on the carbomers and other acrylate polymers when thinking about preservatives and skin-feel?
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