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Looking for preservative? This post is for you
I guess one of the most important thing in formulation is having an adequate preservative, so if you look for better preservative I think it is very beneficial to take a look for the below links.
As a general idea make researchment for two categories of preservative Euxyl and parmetol for me it was amazing discovery.http://www.schulkemicrosites.de/cosmetic-preservation/en/Products/euxyl.php
https://www.yumpu.com/en/document/read/45343725/parmetol-df-35-baz-ltd
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24 Replies
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Thank you for sharing this info.
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@Anca_Formulator thank you for saying thank you ???? you are welcome.
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That post/link(s) - promotional list of Shulke’s preservatives and Parmetol DF35 data sheet that doesn’t even list actives.
DF35 is marketed for household products, not cosmetics. The active is chloromethyl isothiazolinone - a older but good bactericide . Cosmetic grades are used only in rinse off products, unstable at alkaline pH and need an antifungal and chelating agents. It’s b een the go-to preservative for 30 years in most of the shampoos, body washes in the world. -
@PhilGeis hhh the data sheet contains list actives . Then I said take a look for parmetol category the second link was just an example.
Preservative without specifying can be for detergent, cosmetic and more. It is a start point to find the desired one. -
Folks should not use in cosmetics, materials intended for household products even if the same actives.
You can find similar lists of combinations from Inolex, Thor and other suppliers - some reasonably good, some pretty flakey. -
PhilGeis said:That post/link(s) - promotional list of Shulke’s preservatives and Parmetol DF35 data sheet that doesn’t even list actives.
DF35 is marketed for household products, not cosmetics. The active is chloromethyl isothiazolinone - a older but good bactericide . Cosmetic grades are used only in rinse off products, unstable at alkaline pH and need an antifungal and chelating agents.Hello @PhilGeis
What is the robust pairing preservative with Euxyl K 120 (Methylchloroisothiazolinone/Methylisothiazolinone) in herbal acidic shampoo/facewashes?we have EDTA, Parabens, Benzyl Alcohol, Phenoxyethanol. -
At 5 ppm active, I’ve used it successfully with 2600 ppm benzoate and EDTA. Parabens/EDTA is also a good combination. Think you don’t need phenoxy or benzyl alcohols.
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@PhilGeis please correct me.
Paraben is antifungal and weakest against gram negative bacteria and Shampoo is most susceptible to gram negative bacteria. So how is Paraben a good option for shampoo? -
Sorry - my comment was confusing - parabens/EDTA WITH chloromethylisothiazolinone.
Parabens./EDTA alone is not - but good addition to chloromethyl isothiazolinone that is excellent vs bacteria, esp. Gram negatives. -
PhilGeis said:Sorry - my comment was confusing - parabens/EDTA WITH chloromethylisothiazolinone.
Parabens./EDTA alone is not - but good addition to chloromethyl isothiazolinone that is excellent vs bacteria, esp. Gram negatives.Thanks a lot
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@PhilGeis if we go for paraben free, can Euxyl K12+EDTA+Sodium Banzoate work for acidic / Herbal Shampoo/facewash ? or what other combination for paraben free with Euxyl K 120 works?Thanks.
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Not familiar with Euxyl K12.
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sorry it’s Methylchloroisothiazolinone & Methylisothiazolinone It’s Euxyl K 120
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OK. You describe an excellent system - in almost all the Pantene, Aussie, Head and Shoulders, Old Spice, Ivory, etc. for decades.
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@amitvedakar Euxyl k120 is my actual preservative for my products , it is effective and economical however you should be careful in hot process because the temperature of add for it is 40 °C or below.
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In product or process - unstable @ alkaline pH-esp. with amines, oxidizing and reducing agent, in dilute aqueous solution. Do not use in leave on products. Best with EDTA and needs some help vs. fungi.
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Yup - I put it in many of ’em.
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You are welcome @amitvedakar
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This is an interesting look at preservatives used in sunscreen.
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@Perry
Boy Perry - think this guy makes some odd statements..
Benzyl alcohol - 2% is well beyond typical use levels and Eu limit is 1%. It’s pretty weak vs Gram + bacteria and oxidizes primarily to benzaldehyde and an almond odor. It could further oxidize to benzoic acid but no way enough to preserve.
Cap glycol would be weakest vs fungi and should be a booster, not a stand alone or a central element. -
@PhilGeis - in his defense he’s an Australian based formulator with a focus on sunscreen testing. This is why formulators still need the input of microbiologists.
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Just as a side note, even Seinfeld got parabens in his check-list
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