My Sanitizer Gel is sticky too. Please check my formula

DavidWDavidW Member, PCF student
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 you

Water 16.000%
Ultrez 21 0.400%
SD Alcohol 75.000%
Propylene Glycol 8.000%

 
AMP 95 0.400%

Comments

  • Chemist77Chemist77 Member, PCF student
    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. 
  • DavidWDavidW Member, PCF student
    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?
  • Chemist77Chemist77 Member, PCF student
    Generally I have seen around 1-2% in such sanitizers and could be contributing to the stickiness. 
  • Cafe33Cafe33 Member
    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 
  • FekherFekher Member, Professional Chemist
    @Cafe33 thanks for your interesting share. 
  • em88em88 Member
    as @Chemist77said, PEG 400 would help as well, and PG should be dropped to 5% max. 
  • DavidWDavidW Member, PCF student
    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.
  • Cafe33Cafe33 Member
    PG works as you described but in much smaller percentage. 1.5% was way too high. Somewhere around 0.3-0.4 % works well 
  • em88em88 Member
    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
  • em88em88 Member
    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! 
  • AzizAziz Member
    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?  
  • DavidWDavidW Member, PCF student
    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. 
  • Cafe33Cafe33 Member
    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) 

  • Cafe33Cafe33 Member
    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 interval
    And you have tried this level of PG? I tried 1.5% and it was terrible. I can't imagine 5%. 
  • 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.
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