Looking for preservative? This post is for you

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Looking for preservative? This post is for you

Posted by Fekher on July 17, 2022 at 5:28 am

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

ketchito replied 2 years ago 7 Members · 24 Replies
24 Replies

Anca_Formulator

Member
July 17, 2022 at 5:59 am

Thank you for sharing this info.
Fekher

Member
July 17, 2022 at 6:11 am

@Anca_Formulator thank you for saying thank you ???? you are welcome.
PhilGeis

Member
July 18, 2022 at 2:23 am

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.
Fekher

Member
July 18, 2022 at 8:48 am

@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.
PhilGeis

Member
July 18, 2022 at 10:50 am

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.
amitvedakar

Member
July 18, 2022 at 10:56 am

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.
PhilGeis

Member
July 18, 2022 at 7:12 pm

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.
Abdullah

Member
July 19, 2022 at 6:35 am

@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?
PhilGeis

Member
July 19, 2022 at 12:17 pm

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.
Abdullah

Member
July 19, 2022 at 2:38 pm

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
amitvedakar

Member
July 21, 2022 at 5:09 am

@PhilGeis @Abdullah
Thank you.
amitvedakar

Member
July 22, 2022 at 5:03 am

@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.
PhilGeis

Member
July 22, 2022 at 11:16 am

Not familiar with Euxyl K12.
amitvedakar

Member
July 22, 2022 at 11:27 am

sorry it’s Methylchloroisothiazolinone & Methylisothiazolinone It’s Euxyl K 120
PhilGeis

Member
July 22, 2022 at 11:41 am

OK. You describe an excellent system - in almost all the Pantene, Aussie, Head and Shoulders, Old Spice, Ivory, etc. for decades.
Fekher

Member
July 22, 2022 at 1:19 pm

@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.
PhilGeis

Member
July 23, 2022 at 10:58 am

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.
amitvedakar

Member
July 24, 2022 at 4:54 am

@Fekher @PhilGeis

Thank you. I found this preservative in Most big brands shampoo.
PhilGeis

Member
July 24, 2022 at 11:28 am

Yup - I put it in many of ’em.
Fekher

Member
July 24, 2022 at 7:28 pm

You are welcome @amitvedakar
OldPerry

Member
July 25, 2022 at 2:49 pm

This is an interesting look at preservatives used in sunscreen.
PhilGeis

Member
July 28, 2022 at 5:33 pm

@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.
OldPerry

Member
July 28, 2022 at 6:23 pm

@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.
ketchito

Member
November 11, 2022 at 2:21 pm

Just as a side note, even Seinfeld got parabens in his check-list