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Does glycolic acid expire?


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#1 ~ Dee

~ Dee

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Posted 25 June 2007 - 11:43 AM

I bought some a few years ago & I still have it. It's in a cobalt blue glass jar.. There's no expiration date on it.
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#2 barmpot

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Posted 25 June 2007 - 11:55 AM

Yes I think it weakens over time. I bought one with 30% concentration 2 years ago and its weakened considerably since then so I had to buy another one.

#3 ~ Dee

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Posted 25 June 2007 - 12:07 PM

Thanks. I'm not real sure how many years old it is, I know it's over two... Think I'm gonna toss it.
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#4 LordButler

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Posted 27 June 2007 - 03:14 PM

QUOTE(~Dee~ @ Jun 25 2007, 01:07 PM) View Post
Thanks. I'm not real sure how many years old it is, I know it's over two... Think I'm gonna toss it.



Hydroxyacetic acid has a half life of 373.8 days.


So, it takes about 7 years for it to become about 0.75% concentration.


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