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Preserving Herbal Shampoo
Hello, Can someone please recommend a preservative that I can use to extend the life of my herbal infused shampoo? I am using fenugreek and hibiscus infused in water. Will Liquid Germall plus be sufficient?
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7 Replies
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sodium benzoate 0.4% should be perfectly adequate provided you keep the pH to not more than 5.
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Thank you Belassi for the recommendation. I will surely purchase this and do the necessary testing
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Belassi said:sodium benzoate 0.4% should be perfectly adequate provided you keep the pH to not more than 5.
Shall he use Sodium Benzoate or Benzoic Acid ?
How to adjust PH to 5? -
Sodium benzoate goes into ionic solution at pH<5.5 so there is little difference. Please bear in mind that when formulating a shampoo, you need to look at the complete system, not just the preservative alone. For instance, our (discontinued) sulphate-free shampoo had 3% propanediol in it as part of the thickener; it acts as a preservative booster. Ideally I would experimentally reduce the preservative until it failed challenge and then double that amount. In practice nobody has that kind of time.
You can use citric acid to reduce the pH. -
Belassi said:Sodium benzoate goes into ionic solution at pH<5.5 so there is little difference. Please bear in mind that when formulating a shampoo, you need to look at the complete system, not just the preservative alone. For instance, our (discontinued) sulphate-free shampoo had 3% propanediol in it as part of the thickener; it acts as a preservative booster. Ideally I would experimentally reduce the preservative until it failed challenge and then double that amount. In practice nobody has that kind of time.
You can use citric acid to reduce the pH.Thank you very much sir
We need ingredients list and procedures for spider web effect hair cream .
Could you help us in this ? -
Sorry, that is not one of my areas of experience.
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Belassi said:Sorry, that is not one of my areas of experience.
Thank you sir
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