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Are these preservatives and pH 10 enough for this shampoo?
This is my shampoo formula
Active ingredient
SLS 3.5%
SLE2S 4%
CAPB 1.5%
Cationic guar 0.2%
Amodimethicone micro emulsion 1%
EDTA 0.2%
Nacl 1%
CMI MI 2.8ppm
Formaline 0.02%
Citric acid 0.01%
I want to make a version of this shampoo at final pH 10 strongly buffered.
Package is 500ml flip-top bottle.
Is this preservative system and pH 10 enough for preservation?
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4 Replies
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I doubt you’ll have a micro problem but why buffered pH 10? Drop the CMIT - it’s not stable at pH 10 - EDTA/Formaldehyde/alkaline pH are uniquely effective and you’re not going to find too many bugs happy with the pH.
BUT buffered at pH 10 - risks substantial hair damage.
https://onlinelibrary.wiley.com/doi/abs/10.1111/ics.13029
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Thanks.
I was using these preservatives at my other product at pH 6.
I thought adding them to this high pH shampoo will do a quick kill of existing bugs that are introduced during production and before the preservatives loss there effectiveness. what do you think about this idea?
Also formaline is 0.02%. will be effective alone without CMI MI at that small amount?
For high pH shampoo, it would be in contact with hair for ~1 minute and then rinsed with water which has pH ~7. So in that 1 minute, would it matter if it is pH 4, 6 or 10?
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0.02% formalin - 74 ppm formaldehyde at high pH and EDTA -this is prob good enough.
Objective if preservation is to protect consumers - CMIT will be long gone. If buggy ingredients get some good stuff.
I’d not be confident that rinsing will prevent damage.
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I don’t have full access to the document. Was it about high pH leave on product or rinse off product like shampoo?
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