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Viscosity of Hand Sanitizer Gel
Greetings to the forum members,
I formulated 5 litres Hand Sanitizer Gel following the below formulation.
1. Carbopol Ultrez 21 - 12 grams
2. Water - 1.485 litres
3. Ethanol 99.9% - 3.5 litres
4. Glycerine - 9 grams
5. Triethanolamine - 6 gramsThe sequence of formulation was as follows.
A. 12 grams of Carbopol Ultrez 21 is sprinkled to the vortex of the 1.485 litres of DM water in a beaker and mixed for 20 minutes at 650 RPM.
B. 3.5 litres of Ethanol 99.9% is added after 20 minutes of mixing at 650 RPM.
C. 9 grams of Glycerine is added after the addition of Ethanol. The solution at this stage appears hazy.
D. 6 grams of TEA is added at once finally and as soon as it is added the solution begins to appear clear.However, the viscosity of the resultant product is not much promising.
Is the above method of dispersion and mixing correct or there are better methods of dispersing Carbopol Ultrez 21 ???
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9 Replies
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It’s impossible to read. Translate it into percentages and check the pH. There might be multiple reasons: not enough carbopol, the concentration of alcohol is higher than what carbopol can thicken, not enough TEA, so pH is still too low etc..
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1. Carbopol Ultrez 21 - 0.24 %
2. Water - 29.46 %
3. Ethanol 99.9% - 70 %
4. Glycerine - 0.18
5. Triethanolamine - 0.12 %
The pH of the final product was 6.35 -
% carbomer seems too low, I would increase it to 0.33% and try again.
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you can also try pHing the carbomer before adding in alcohol
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Ultrez-21 will not give you sufficient viscosity in a hydroalcoholic solution … use Carbomer instead at 0.5%
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@MarkBroussard Which carbomer do you suggest instead of Ultrez 21 ???
Ultrez 21 provides acceptable clarity to the finished product which the other carbomer may not provide.
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What is the expected viscosity you are looking for?
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@em88 I am looking for a viscosity of around 10,000 mm2/s
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Try Ultrez-10
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