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My Sanitizer Gel is sticky too. Please check my formula
Hi all,Need help. I made the formula below and also a variation with 4% propylene glycol and 20% water. It is fairly sticky. Any idea why?I used AMP 95 to neutralize because I found that if I use TEA I can only go up to pH 5. something and then the product turns cloudy.Any ideas on how to make it less sticky? Thank youWater 16.000% Ultrez 21 0.400% SD Alcohol 75.000% Propylene
Glycol8.000% AMP 95 0.400% -
19 Replies
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I have found UCON fluid 75-H-450 to be helpful in reducing the stickiness of such formulations, say @0.5-1%. Also that’s an extremely high dosage of PG, you could reduce it to 1-2% or another option would be PEG-400 as I have seen people using this to reduce the stickiness.
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Thank you. I don’t have UCON but I do have PEG 400 so I’ll give it a try.
Why do you think that is a high amount of PG?
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Generally I have seen around 1-2% in such sanitizers and could be contributing to the stickiness.
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Yikes ! 8% propylene glycol, I use a combination of 1% Glycerine and 0.4% Propylene glycol. Excellent results (using 0.30 % Carbomer)
1.5 % Propylene Glycol gave bad results in terms of hand feel
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@Cafe33 thanks for your interesting share.
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as @Chemist77said, PEG 400 would help as well, and PG should be dropped to 5% max.
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Thanks everyone. I thought the more PG I had the more “slip” and moisturizing it would be. I took it out altogether and now I have very little sticky feeling. Not sure why that happens though. It is interesting.
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PG works as you described but in much smaller percentage. 1.5% was way too high. Somewhere around 0.3-0.4 % works well
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Cafe33 said:PG works as you described but in much smaller percentage. 1.5% was way too high. Somewhere around 0.3-0.4 % works well
That’s way too low.
3-5% is the right interval -
DavidW said:Thanks everyone. I thought the more PG I had the more “slip” and moisturizing it would be. I took it out altogether and now I have very little sticky feeling. Not sure why that happens though. It is interesting.
Congrats!
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Cafe33 said:Yikes ! 8% propylene glycol, I use a combination of 1% Glycerine and 0.4% Propylene glycol. Excellent results (using 0.30 % Carbomer)
1.5 % Propylene Glycol gave bad results in terms of hand feel
Which Carboner you use and what is your final formula and procedures?
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Hi Aziz. I am using Ultrez 21 because that is what we stock for other types of products. I’m just curious why something like PG that normally may give some “slip” to products causes a sticky feeling in this type of product.
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I am using
Carbopol 940 - 0.30%
TEA - 0.30%
Glycerine - 1.00 %
Propylene Glycol - 0.40%
Fragrance - 0.10% (Dissolved in Glycerine)I am using EtOH 96% and dH20 (I don’t have the numbers by memory)
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I made a version I quite liked with 4% PG, 1% PEG600, 0.4% Glycerin. It beat Purell in a blind trial with some office workers next door, too!
This was for 70%v/v ethanol, I imagine going lower or higher will give different results. -
very interesting discussion
Can i make this percentage of propylene and glycerin with hand sanitizer liquid ( 70 isopropyl alcohol) because i have this sticky feeling with propelene alone or glycerin alone too -
I remember there were studies in which Glycerine at 1.45% (w/w) reduced the potency of alcohol based sanitizers (https://www.researchgate.net/publication/235715039_Glycerol_significantly_decreases_the_three_hour_efficacy_of_alcohol-based_surgical_hand_rubs), so I’d be very cautious about its dosage. I believe the same applies for PPG. On the other side, Ethylhexylglycerin and Panthenol work well without this drawback.
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This is a drug product in the US, subject to the same regulatory , quality and manufacturing requirements of any drug.
FDA has given temporary relief during covid - in this they specify WHO ethanol standard of 80%
https://www.fda.gov/media/136118/download -
Cafe33 said:em88 said:Cafe33 said:PG works as you described but in much smaller percentage. 1.5% was way too high. Somewhere around 0.3-0.4 % works well
That’s way too low.
3-5% is the right intervalAnd you have tried this level of PG? I tried 1.5% and it was terrible. I can’t imagine 5%.
Yes. I don’t know what was terrible from your side, but for me, it was way better.
alchemist01 said:I made a version I quite liked with 4% PG, 1% PEG600, 0.4% Glycerin. It beat Purell in a blind trial with some office workers next door, too!
This was for 70%v/v ethanol, I imagine going lower or higher will give different results.Glycerin should not do much at that level. I thought about adding PEG too, and I guess it should make the gel have a better sensorial feel. 1% PEG 400 or 600 should be indeed enough.
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