[CosmoMan]

ozgirl said:

There is a little bit of information in this article.

https://www.americanpharmaceuticalreview.com/Featured-Articles/38885-Antimicrobial-Preservatives-Part-Two-Choosing-a-Preservative/

It is best to just contact the supplier to confirm what packaging is best.

Thanks for the link. I’ll read through it.

Contacting the supplier. I emailed the maker, Ashland, over a week ago and received no response. 

https://www.ashland.com/industries/personal-and-home-care/skin-and-sun-care/optiphen-plus-preservative

[CosmoMan]

Pharma,
I’d like to say thank you. 

[CosmoMan]

Pharma said:

Rule of thumbs:

>20%: Microbes stop growing

40-70%: Microbes die

>70%: Useless

 Is >70%: Useless defined as, we can’t use this high of an amount?
Thanks.

[CosmoMan]

Hello Everyone,

My name is Ryan from U.S.A. I’ve been creating my own formulas since 2012. I started with cold process soap, then moved to lotions, shave soaps, pre-shaves, then aftershaves. I was directed to this forum while watching Perry’s videos. My formulating started by reading and learning all about the ingredients. My interests continue, so I can look forward to formulating different types of products.