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Do i need preservative in this laundry detergent formula at pH 10
Do i need preservative in this laundry detergent formula at pH 10
Formula
SLS 3.8% activeLABSA 1.5% activeLauryl glucoside 3.5% activeEDTA 1% or citric acid 1-3%CMC 0.5%WaterpH 10If Yes, can i use CMI MI or formalin?
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10 Replies
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Maybe not CMI - it’s unstable at 10 so effect is very time limited
Benzoisothiazolinone is ,prob more common in this category. -
PhilGeis said:Maybe not CMI - it’s unstable at 10 so effect is very time limited
Benzoisothiazolinone is ,prob more common in this category.Got it
Thanks -
If i dont use preservative in this product at pH 10, which microorganism will grow in it?
And as this product will not be in contact with human skin, what is the side effects if the product got contaminated? -
The same ones that grow in Liquid Tide. Odor, color and clarity compromised.
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PhilGeis said:The same ones that grow in Liquid Tide. Odor, color and clarity compromised.
Got it
Thanks -
Halomonas Nesterenkonia Bacillus are the genera whose species can grow in high pH products
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PhilGeis said:Halomonas Nesterenkonia Bacillus are the genera whose species can grow in high pH products
Thanks
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In our experience, at a pH of 10, a preservative is not required. We always do a microbial test and continue regular microbial testing beyond the shelf life. In 10 years have never had any positive microbial results.
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mikethair said:In our experience, at a pH of 10, a preservative is not required. We always do a microbial test and continue regular microbial testing beyond the shelf life. In 10 years have never had any positive microbial results.
Thanks for sharing
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@mikethair
pH 10 is not prohibitive. The recent recall of PineSol products (pH 10-11) is a recent example. https://pinesolrecall.com/?msclkid=7221f00cbb641775ef2b93631ee60e86&gclsrc=ds&gclsrc=dsContamination in liquid laundry (Tide), household cleaners as above and even bar soaps are additional examples.
Micro testing is often misdirected. Bugs growing at pH 10 may not grow on conventional media of +/- neutral pH. the Fabric softener Downy (acidic pH) includes a preservative to control a specific microbe that only grows at pH 5 and below and was missed for years by testing with conventional media.
Laundry and similar products use preservatives to control manufacturing contamination - they don’t worry about consumer use as bugs ok with the tough conditions aren’t usually found in households.
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