Members Directory - Chemists Corner

PhilGeis

Member

August 25, 2022 at 5:56 pm in reply to: Robust Preservative Combos?

It’s water soluble.

PhilGeis

Member

August 25, 2022 at 5:10 pm in reply to: Robust Preservative Combos?

As you said - chelator. Would add EDTA to those options.
pH might drive greater levels of benzoate in nonsurfactant products but think the max are too much.

PhilGeis

Member

August 25, 2022 at 9:34 am in reply to: Beyond 100%

If yield - leaking heat exchanger

PhilGeis

Member

August 24, 2022 at 1:06 pm in reply to: Storing production water in production tank before production for several days or weeks

304 is prob ok. Never plastic - impossible to effectively sanitize ongoing.
I’ve used low level hypochlorite injection for household product water. Would oxidize iron. No experience with formalin.

PhilGeis

Member

August 24, 2022 at 10:35 am in reply to: what preservative can i use for my conditionner

shoot for 1000 ppm as acid

PhilGeis

Member

August 24, 2022 at 10:33 am in reply to: Storing production water in production tank before production for several days or weeks

None is cheap and an iron system is pretty poor for water storage or much else. Between biofilm and water and micro-based corrosion, think its not going to serve well.
EDTA would make it worse and ozone is out of the question.

Stainless (316) will be more costly now but less in long term

PhilGeis

Member

August 24, 2022 at 10:26 am in reply to: 3rd party audit companies

Think major cosmetic guys largely do their own contractor audits. Whoever you use, suggest your specific auditor should have major company background.

PhilGeis

Member

August 24, 2022 at 10:19 am in reply to: Hi friends EGDS is not available more

and reduce the benzoate to ~3000 ppm

PhilGeis

Member

August 23, 2022 at 3:16 pm in reply to: Storing production water in production tank before production for several days or weeks

Water is a primary source of contamination in cosmetic manufacturing. Stored, in whatever tank, vessel, bugs will grow and perpetuate themselves in biofilm. You’ll need some mechanism to control that problem and that typically involves a recirculating systems - the optimal systems is preserved with as constant heated water or ozone treated. Some use UV light and a micro filter recirculating through a storage tank with periodic sanitization of the system.
Hope you/ve stainless steel rather than PVC.

PhilGeis

Member

August 23, 2022 at 2:05 pm in reply to: Storing production water in production tank before production for several days or weeks

Do not store water.

PhilGeis

Member

August 23, 2022 at 2:02 pm in reply to: Hi friends EGDS is not available more

5ppm with EDTA

PhilGeis

Member

August 23, 2022 at 2:01 pm in reply to: what preservative can i use for my conditionner

Agree re Germall + and add EDTA - you could also use Kathon/Na benzoate/EDTA

PhilGeis

Member

August 23, 2022 at 10:52 am in reply to: Is it normal for formalin so produce foam when transferred from one ti another package

Good luck then. Maybe be same wholesaler but different producers.

PhilGeis

Member

August 23, 2022 at 9:39 am in reply to: Is it normal for formalin so produce foam when transferred from one ti another package

Did you get a coa?

PhilGeis

Member

August 23, 2022 at 9:36 am in reply to: Hi friends EGDS is not available more

Na benzoate is not enough. You could add chloromethylisothiazolinone as do many of the major marketers.

PhilGeis

Member

August 22, 2022 at 7:30 pm in reply to: Hi friends EGDS is not available more

Benzoate by itself is not a good preservative - esp. in a shampoo.

PhilGeis

Member

August 22, 2022 at 1:08 pm in reply to: Hi friends EGDS is not available more

Wonder at Na benzoate by itself as adequate preservative for a shampoo.

PhilGeis

Member

August 21, 2022 at 11:16 pm in reply to: Stop using natural preservatives and eco cert preservatives

Thanks!

PhilGeis

Member

August 21, 2022 at 8:10 pm in reply to: Stop using natural preservatives and eco cert preservatives

@ngarayeva001 - could you specify the class of preservatives?

PhilGeis

Member

August 20, 2022 at 1:04 pm in reply to: How do determine cosmetic expiration dates

Here’s protocol of the type major companies use — https://cosmeticseurope.eu/files/5914/6407/8121/Guidelines_on_Stability_Testing_of_Cosmetics_CE-CTFA_-_2004.pdf

PhilGeis

Member

August 20, 2022 at 10:55 am in reply to: No growth on dipslides despite purposeful contamination - a mystery

@chemicalmatt
Much as I think these are gimmicks for cosmetic testing, also know you’re solid in your work. Can you describe your application?

PhilGeis

Member

August 20, 2022 at 10:53 am in reply to: PET Training?

There are no controls per se - but you might compare a major product at increasing dilution (100%, 50%, 30%) to get a feel for the test and generate differential data.
Shampoo probably since it will go into solution.

PhilGeis

Member

August 19, 2022 at 9:50 pm in reply to: PET Training?

Here’s USP 51 as Matt mentioned. http://www.uspbpep.com/usp29/v29240/usp29nf24s0_c51.html

PhilGeis

Member

August 19, 2022 at 9:48 pm in reply to: No growth on dipslides despite purposeful contamination - a mystery

Water is prob ok - product not so sure.
Undiluted product would be the worst. Assume you’ve diluted product. Would have to satisfy suitability for each product. In that context might be ok for some - but even there, question the volume actually exposed.

PhilGeis

Member

August 19, 2022 at 7:39 pm in reply to: PET Training?

Have you been trained in aseptic technique?

PhilGeis

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