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TEA limits
Greetings,
I was wondering if there is any limit in concentration about using TEA in shampoo. According to Handbook of excipients, they mention a limit of 5% but for emulsions/creams. I tried to google about this topic, but not that much luck. Do you have any info regarding this?
Thank you
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13 Replies
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2.5% limit for leave on products in the EU, not sure if that applies to total addition or free amine content.
5% TEA ? that’s a hell of a lot. Any particular reason for that?
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This CIR report says 5% for leave-on is max. They don’t list a max for rinse-off products. https://online.personalcarecouncil.org/ctfa-static/online/lists/cir-pdfs/pr594.pdf
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Can’t believe I missed the cosmetic ingredient database. Thanks
From my tests the quantity of TEA ,to regulate the pH, is around 3%. I may use NaOH, but TEA was an easier and cheaper alternative.
@Perry, do you mind attaching that pdf here, I don’t have an account at the site you linked.
Thank you Duncan and Perry -
I don’t think an account is required.
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But here is a copy.
https://www.dropbox.com/s/mdh9ocmxchad001/TEA-safety.pdf?dl=0
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The On-Line INFOBASE is a paid subscription service that is only available to Council members.
Why would you need that much for a shampoo?.
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@Perry, both links worked! Thank you
@DAS, I have to neutralize the shampoo in the end. -
Tried a sample, where I reduced TEA to 2% and added 0.5% of NaOH 20%. It worked fine.
I’ll try a few more combinations like this 🙂 -
How acidic is the shampoo that you require such high amounts of alkalis to bring it to the acceptable pH level or is it a neutralising shampoo for some post keratin/acidic hair straightening treatment.
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The pH is 3.5 but in the end I have to have the pH of the shampoo 7 in order for the API to be stable,
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In that case you definitely need a good amount, have you thought of AMP-95. A very good one that though bit on expensive side.
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Could just use a solution of 10% sodium hydroxide. As a rule of thumb 10% sodium hydroxide has the same pH adjusting ability as TEA.
If your Naoh solution is stronger / weaker just pro-rata it
It’s also a hell of a sight cheaper
Only reason I’d choose TEA (or AMP) is if I was making a hydroalcoholic carbomer gel. Sodium hydroxide tends to haze out in those, TEA or AMP being organic are more compatible with the alcohol
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@Chemist77, unfortunately I don’t have that ingredient in my lab. I will ask for it for the future projects where price is not set very low. Thank you
@Duncan, I was thinking to use NaOH only for the next trial, because i suspect TEA increases the viscosity more than I need. Right now the viscosity is 6.8 cP.
Thanks for the tip regarding hydroalcoholic gels. 🙂
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