Liquid hand soap formulating problem

Hi, im a new in a liquid hand soap making process. I triy to replicate one of the product that already been sold in the market. After a little change to cut the cost, the result is still quite similar with a good viscosity and good foam.

But the problem occur after i add fragrance oil, the viscosity is decrease so much.  And after i try the soap, the fragrance is not strong enough. 

Here is my formulation per 100ml:

Aqua qs.

SLES 6 gr

Cocoamidopropyl betaine 3 ml

Sodium chloride 2,3 gr

Sodium benzoate 1 gr

Glycerin 1 ml

Cocoamide DEA 1 ml

Glycol disteartae 1 ml

Fragrance oil 0,5~1 ml (different for each scent)

Citric acid 0,2 gr

Aloe barbadensis extract 0,2 ml

EDTA 2Na 0.1 gr

Phenoxyethanol 0,1 ml


And this is the ingredients of the reference product i tried to replicate:

Aqua, SLES (4,28%), Cocoamidopropyl betaine (2,90%), lactic acid, sodium chloride, sodium benzoate, polyquarternium-7, glycerin, tetrasodium glutamate diacetate, benzotriazolyl dodecyl p-cresol, parfum, mel, pottasium sorbate, aloe barbadensis.


So, this is my questions:

  1. Is it possible to counter the viscosity problem without adding any thickener? And how?
  2. If i have to use thickener, can i use hydroxypropyl methylcellulose (HPMC)? And when should i add hpmc in the process?
  3. Is there any other alternative to make the scent more noticeable and last longer in skin without adding more parfume?
  4. Is it necessary to add polyquarternium-7?
  5. Is my formula good enough? Is there anything i should change or improve?
  6. How can the reference product maintain its viscosity with the lower amount sles? 

Im sorry for this so many questions. I've been face a lot of issues since the first time i try to make this soap (like the foam doesn't want to rid off after washing, etc) i really hope i can get the answer here :)


Your help is highly appreciated.Thank you so much!

Comments

  • BelassiBelassi Member, PCF student
    1. That's a pathetically small amount of surfactant. So, NO.
    2. You will have to experiment.
    3. Loss of viscosity caused by adding fragrance is a usual problem.
    4. No.
    5. No. Yes.
    6. No idea.
    also, sodium benzoate is more than twice as high % as normally used.
    Cosmetic Brand Creation. Concept to name to IMPI search to logo and brand registration. In-house graphic design inc. Pantone specs. Cosmetic label and box design & graphics.
  • Belassi said:
    1. That's a pathetically small amount of surfactant. So, NO.
    2. You will have to experiment.
    3. Loss of viscosity caused by adding fragrance is a usual problem.
    4. No.
    5. No. Yes.
    6. No idea.
    also, sodium benzoate is more than twice as high % as normally used.
    Thank you Belassi!
    how much should i add the surfactant?
    I've tried using 10% of sles, 3 ml CDEA and 2 ml CAPB per 100ml, but the foam is hard to get rid of. The foam is keep forming with just a litlle scrub.
  • BelassiBelassi Member, PCF student
    Foam is what you want, surely, in a hand soap. At least I do. I use an ASM of about 10% for pump-bottle soap.
    Cosmetic Brand Creation. Concept to name to IMPI search to logo and brand registration. In-house graphic design inc. Pantone specs. Cosmetic label and box design & graphics.
  • What does ASM stand for?
    Thanks
  • ASM stands for active surfactant matter. It is very important to have correct and sufficient proportion of primary and secondary surfactants in your formulation. I once formulated a soap which resulted in sticky feeling after washing hands and the soap still remained on my palms even after rigorously rinsing hands with water. 
  • HalimHalim Member
    Dear Murtaza could you suggest which ratio is good for Sles- betain- coco Dea and Coco glucoside for hand soap
    Best Regards
  • Sorry for the late comment on this discussion. Dear @MurtazaHakim, I also experience the same problem where my hand wash become sticky and still foaming after rinse. My formulation consists of SLES (30%):CAPB (30%):DEA with ratio 4:1:0.5. Although I reduce the ratio to 3:1:0.5, it is still foaming when I rub my hands after rinsed. Do you have any idea why it keeps foaming? Thank you in advance
  • . Increase the phenoxyethanol to %1
    . Reduce the sodium benzoate to <0.5

    For viscosity 
    Remove glycerin
    Reduce the fragrance 
    Increase the betaine

    And as belassi said, increase the total amount of active surfactant to around %10
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