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Author Topic: Preservatives in Liquid Hand Soap  (Read 2979 times)
Opulence
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« on: September 14, 2011, 03:58:20 PM »

Hi,
I made liquid hand soap at a class recently.  I want to break down what I have into 4 - 8 oz foaming bottles and add a preservative.

Could anyone recommend how much preservative to use for an 8 oz bottle.  I was planning on using Optiphen Plus; I also have Potassium Sorbate (I think this is more for food) & Tinosan SDC (since this is a natural preservative, I probably won't use this one . . . I'll save it for something special!).

Please advise.
Thanks and make it a great day!
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ceebee2001
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« Reply #1 on: September 14, 2011, 07:11:07 PM »

There was a large discussion on the Yahoo liquid soap forum about this topic this week.  Basically when you use a foamer it is guaranteed to grow beasties in it.  The originator of the thread had two soaps sent in for testing over a 4 week period.  One she made one another soaper made.  She had used two preservatives in hers and over the testing time it failed as well as the other liquid soap.  This is one reason I will not sell my liquid soaps, it for family only.  I might suggest you check out the yahoo groups that specialize in liquid soaps if you plan on selling.  They are a wealth of information.
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Opulence
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« Reply #2 on: September 15, 2011, 08:56:09 AM »

Thanks!  I will check it out.  I wonder if this is the process for lotions and other liquid products, as well.
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ceebee2001
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« Reply #3 on: September 15, 2011, 01:27:42 PM »

Here is the article I was talking about.  

[c As promised, I'm here to share some rather surprising results from the
> liquid soap preservative test I recently had done.
>
> Liquid soap definitely needs a preservative. I tested my unpreserved LS and
> another soapmaker's unpreserved LS. Both had bacterial contamination upon
> the labs receipt (meaning nothing was injected into these samples, they
> arrived with their own.) My LS had a different strain of bacteria from the
> other soapmaker's LS, which I found interesting. My LS was tested at regular
> minimum dilution and foamer dilution. The other soapmaker's was tested at
> foamer dilution only.
>
> The LS that I used preservative on did not pass the challenge testing. I
> let some samples sit out for 2 weeks and swished a finger in occasionally. I
> used those preservatives at the manufacturers lowest recommended usage rate
> (Suttocide A & Optiphen.) Although my clean samples arrived clean, they did
> NOT hold up to the challenge test and when yeast was introduced, they grew.
> So using these preservatives at the lowest recommendation was not enough to
> pass a FDA challenge test if it were done. It also wasn't enough to keep
> bugs from growing should the product be contaminated in some way by the
> consumer.
>
> I'm not sharing this information to debate the facts, just sharing this
> information for those that are interested. Obviously more testing needs to
> be done and if you're selling yours, I suggest you might want to have it
> tested, as well.
>
> By the way, I do not superfat my soap. I use Failor's method in that I use
> enough KOH so as to totally saponify all oils. I also did not lower the pH
> in most of my samples. Only two were lowered with borax and they did not
> pass the testing either. So higher pH of 10 is not hostile enough for
> bacteria.   What I'm pulling from this test is: When making liquid soap, you need to be
> as clean as you are when making lotions. Items need to be sanitized, gloves
> worn, hair covered, etc. and you need to preserve at higher than minimum
> levels with Optiphen and Suttocide A. I'm going to be upping my preservative
> and doing further testing until I find where it needs to be.

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ceebee2001
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« Reply #4 on: September 15, 2011, 01:29:41 PM »


Could anyone recommend how much preservative to use for an 8 oz bottle.  I was planning on using Optiphen Plus; I also have Potassium Sorbate (I think this is more for food) & Tinosan SDC (since this is a natural preservative, I probably won't use this one . . . I'll save it for something special!).


Do your botttles or manufactures website give you any guidelines?
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Opulence
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« Reply #5 on: September 15, 2011, 06:40:54 PM »

I will check with the manufacturer when I receive the preservatives . . . which I hope is soon.
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