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lowest pH at which SLES can be stable Long term
I want to make shampoo at lowest pH possible. Below pH 5
What is the lowest pH at which ALS,SLES, CAPB and lauryl Glucoside can be stable Long term specially SLES?
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8 Replies
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@Abdullah SLES due to the presence of an ether group, might be the more sensitive of that group. I remember some degree of hydrolisis might occur below a pH of 4 (at higher pH, some hydrolisis can also occur, it’s so little and slow that it becomes irrelevant). That’s why acid cleansers don’t use SLES.
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@ketchito so what anionic surfactant should we use in acid cleanser?
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@Abdullah I’ve seen Sulfonates (like AOS) as very common anionics in low pH products.
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@ketchito what about SLS and ALS?
I will not formulate in very low pH. Any pH below 5 at which SLES can be stable is good.
How do you know if hydrolysis is happening so i can check up to what pH it is stable?
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in my experience, SLES is stable down to pH 3 (not tried any lower than that) - if the acid is non-nucleophilic, e.g. citric or lactic, ethers can’t easily be hydrolysed
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@Bill_Toge thanks.
What about salicylic acid? -
again, it’s effectively non-nucleophilic, so it’s likely to have minimal if any reactivityit’d be quite a different story if you were using hydrobromic or hydroiodic acid
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That’s Bill
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