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What is cause? Hec is swells
I use hec in shampoo 0.8% with egds. Sles70%
Betaine 30% .salt and sodium benzoate as preservative . The bottle swells (bulges) after a 2-3 day period. What is wrong? -
16 Replies
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Sodium benzoate is not enough as preservative
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Abdullah said:Sodium benzoate is not enough as preservative
What i should use instead of sodium benzoate? I also have formline is right ?
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DMDM hydantoin or CMI MI+ sodium benzoate.
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Abdullah said:DMDM hydantoin or CMI MI+ sodium benzoate.
Yes but yet i use sodium benzoate in tha same formulation without hec nothing wrong happened.i uses hec in dishwashing liquid and laundry liquid detergent and final sodium benzoate as a preservative it was ok.
What about egds and hec together before 5 year ago we have used EGDS with stearic acid in shampoo the same problem happened.
After sometimes the bottles are swells. -
@saeedulfat Keep in mind tat HEC is a cellulose based material, hence, a food source for microbes. If you didn’t have that issue with a formula based only on Sodium benzoate (not broad spectrum and dependent on pH and the type of surfactants you’re using), it might be as you describe, because you didn’t have HEC before. It doesn’t mean you didn’t have microbes presence before, but you didn’t have visual signs of their presence.
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ketchito said:@saeedulfat Keep in mind tat HEC is a cellulose based material, hence, a food source for microbes. If you didn’t have that issue with a formula based only on Sodium benzoate (not broad spectrum and dependent on pH and the type of surfactants you’re using), it might be as you describe, because you didn’t have HEC before. It doesn’t mean you didn’t have microbes presence before, but you didn’t have visual signs of their presence.
Yah very helpful information.i will try hpmc with different preservative then i will look how will be the result . Very thanks mr ketchito .
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what is the viscosity of your product at 0.8% of HEC? How much salt are you adding with 70% SLES and 30% betaine?
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Stanley said:what is the viscosity of your product at 0.8% of HEC? How much salt are you adding with 70% SLES and 30% betaine?
The viscosity is 3000 and the salt is 2.5%
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i would agree that preservation system is no enough. what is the pH of the system?
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Julia_S said:i would agree that preservation system is no enough. what is the pH of the system?
The ph is 5.5 and the percentage % of sodium benzoate is not enough or add different kinds preservatives.i tried the same formulation with hpmc nothing is bad not happened swelling.
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At 5.5 sodium benzoate is mostly in the salt form which is ineffective as a preservative. Agree with other comments on that you need to switch to a different preservation strategy.
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Just to be clear, we’re suggesting that the bottle swelling is caused by the result of microbial growth. It’s like when bread dough rises.
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evchem2 said:At 5.5 sodium benzoate is mostly in the salt form which is ineffective as a preservative. Agree with other comments on that you need to switch to a different preservation strategy.
No man the sodium benzoate is 1.25% the ph is 5.5
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@saeedulfat The active preservative is Benzoic acid, but since it’s not too water soluble, Sodium benzoate (the salt) is prefered, with the premise that you need to lower the pH to have Benzoic acid. At high pH, you’ll have Sodium benzoate instead. At a pH of 5.5, you’ll have a mixture of both, so the lower the pH, the more Benzoic acid you’ll have.
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saeedulfat said:evchem2 said:At 5.5 sodium benzoate is mostly in the salt form which is ineffective as a preservative. Agree with other comments on that you need to switch to a different preservation strategy.
No man the sodium benzoate is 1.25% the ph is 5.5
1.25% sodium benzoate at pH 5.5 gives you 0.05% benzoic acid.
You need at least 0.1% benzoic acid for fungi.
For bacteria you need much more benzoic acid.So sodium benzoate is not enough as preservative at pH 5.5 even if you use 2.5%.
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Yes i will try soon.
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