DMDM hydantoin vs phenoxyethanol comparison as antibacterial for a lotion - Advanced Questions - Chemists Corner

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Advanced Questions

DMDM hydantoin vs phenoxyethanol comparison as antibacterial for a lotion

Posted by Abdullah on January 31, 2022 at 1:19 pm

In a lotion in combination with a fungicide, what percentage of DMDM hydantoin will have the same antibacterial properties as 0.5% phenoxyethanol?

Abdullah replied 1 year ago 3 Members · 9 Replies
9 Replies

PhilGeis

Member
January 31, 2022 at 1:29 pm

2000-3000 ppm is what I’d use
Abdullah

Member
January 31, 2022 at 3:18 pm

@PhilGeis 2000 ppm of 55% solution with is 1100ppm actual DMDM hydantoin. Am i correct?
PhilGeis

Member
January 31, 2022 at 4:38 pm

I referred to active concentration.
Abdullah

Member
February 1, 2022 at 2:12 am

PhilGeis said:

I referred to active concentration.

Thanks.
I didn’t know phenoxyethanol is that good as anti bacterial preservative compared to DMDM hydantoin.
Perry

Member
February 1, 2022 at 3:13 am

@Abdullah - one of the problems with phenoxyethanol is the odor.
Abdullah

Member
February 1, 2022 at 7:33 am

Perry said:

@Abdullah - one of the problems with phenoxyethanol is the odor.

Yes.
And for me reducing emulsion stability and viscosity of product is also a problem. But these two are the only options for bacteria i think.
PhilGeis

Member
February 1, 2022 at 12:06 pm

You can use combinations of others based on pH but would need testing
Abdullah

Member
February 1, 2022 at 2:06 pm

PhilGeis said:

You can use combinations of others based on pH but would need testing

Yes but as these two are the least expensive, i have to stick with one or both of these two.
PhilGeis

Member
February 1, 2022 at 4:40 pm

There also better than the odd combination
Abdullah

Member
February 2, 2022 at 2:09 am

PhilGeis said:

There also better than the odd combination

Yes

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