PhilGeis
Forum Replies Created
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the formula you need is: concentration1 X volume1 = concentration2 X volume2
Concentration1 - is the % in the raw material DMDM hydantoin 55%
Concentration2 - the target concentration in your product - 1500 ppm - 0.15% (think 2000 ppm would be better)
Volume1 - is the amount of raw material 55% DMDM hydantoin to be added to your product
Volume2 - is the total volume of your product
For 100 ml of product - you’d add ~0.27 ml.
Please tell us the biosurfactant. That “preservative” capacity is highly doubtful - more likely (marketing) BS.
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Don;t know your claims but it appears you’re selling a soap - not a cosmetic. Ingredient labeling is not necessary.
https://www.fda.gov/cosmetics/cosmetic-products/frequently-asked-questions-soap
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“liquid germall” - as in Germall Plus?
see this video - https://www.youtube.com/watch?v=UPjoOQDyQMo
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I’d not get too carried away with pKa - your formula may impact. Suggest 2500-3000 Na benzoate at favorable pH. Do not think sorbate/DHA buys anything more and brings in more question of stability.
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Why? A pH limitation?
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Citric lactic - suppose can try either. I’m just a preservative guy.
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Think that would be better
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Can you lower the pH enough to accomodate an organic acid?
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That combination is not esp. good vs. fungi - or much else beyond phenoxy by itself.
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I’ve heard the same for ZPT - data did not support. What are the data for piroctone?
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Familiar with Piroctone olamine as a dandruff active - it’s another hydroxamate chelator. Not much experience as preservative - efficacy, stability, formula interactions, water quality- cations
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Pools as simple water solution without the cosmetic poo and goo and biguanides are substantive - cosmetic packaging offers much more surface area to a small volume of product.
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Graillotion is as always quite correct.
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Not sur the max - but at least
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Just sales literature
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Prob not much difference but use the 1st - there are some data for EHG as booster. I’d drop the phenoxy to 0.5%.
I don’t know why anyone would bother with Phenethyl alcohol as a preservative when they can use phenoxy.
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Per Graillotion’s comment- what’s pH?
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As always chemicalmatt is spot on. BKZ is so lame that Pseudomonas grows in the stuff
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“Hands on”? I thought the course was online.
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The ecocert BS has no limits
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Right - but still think “Jaws” theme would have been more catchy
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for example - https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1467-2494.1988.tb00582.x
and
https://pubs.acs.org/doi/pdf/10.1021/jf60232a072
Nothing is perfect - suggest use what works well in as many preservative applications as possible
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Thanks. Schwartz is an old pal from P&G so I trust the report.
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In theory with Phenoxy/EHG - you need to address yeast/mold and to a lesser extent Gram +.