Home Cosmetic Science Talk Formulating Dishwashing Liquid

  • Dishwashing Liquid

    Posted by InvisibleDoctor on March 17, 2021 at 4:47 pm

    Hey Guys! 

    I discovered this website through a google search and wondered if you could help me?

    I’ve had experience formulating moisturisers and sanitisers but I’ve now been asked to formulate a dishwashing liquid. 

    I’ve been given a list of acceptable chemicals and from those have come up with the following formulation:

    Ingredient                                               %W/W

    Water 61.99
    Sodium Lauryl Ether Sulphate (70%) 13.9
    Sodium Dodecylbenzene Sulphate (30%) 5.51
    Glucopon 425 (60%) 6
    Cocoamidopropyl Betaine (30%) 2
    Dimethyl Lauramine Oxide (30%) 4
    Ethanol 3
    Citric Acid 0.5
    Sodium Chloride 1
    Sodium Benzoate 1
    Colour 1
    Fragrance 0.1

    I’m not sure how well this would work, and whether I would have trouble with blending any of the ingredients if it does work.

    Does anyone have any recommendations?


    philgeis replied 2 years, 8 months ago 2 Members · 5 Replies
  • 5 Replies
  • philgeis

    March 18, 2021 at 10:47 am

    Happi (Household and Personal Product Industry) magazine includes product formulae - check back issues.   (https://www.happi.com/issues/2021-03-01/).
    Re. above - what pH and why benzoate?  You’ll prob need a preservative but these products are usually alkaline in pH (8-9) so benzoate is not useful in that context.  Most use isothiazolinones.

  • InvisibleDoctor

    March 18, 2021 at 1:00 pm

    Hey! I was planning on the pH being 8-9 but the only preservative on my list was Bronopol  which I believe also has a better activity in the lower pH ranges. I also found  during my research that Bronopol loses stability at pH 4 & above. My only reasoning for adding Benzoate was the choice between the two but perhaps I can leave it out all together. Still doesn’t solve my preservative problem with restricted ingredients however. 

  • philgeis

    March 18, 2021 at 2:41 pm

    You can’t use isothiazolinones preservatives?  these are the most commonly used in such products - methyl- and benzo-.

  • InvisibleDoctor

    March 18, 2021 at 5:57 pm

    No, unfortunately I was given a very specifc list with the instructions to make a dishwashing liquid. The only preservatives on that list were Sodium Benzoate and Bronopol. I would definitely have tended towards isothiazloninones if they were listed. 

    I think it’s more of a test to see what I come up with and whether I can pick up a branch of chemistry that’s not my current area. 

  • philgeis

    March 18, 2021 at 7:49 pm

    Bronopol - an odd demand.   In US, dishwash liquid preservatives are regulated by EPA and must be registered pesticides.   Think Bronopol may be regist’d but not sure for food contact.  https://archive.epa.gov/pesticides/reregistration/web/pdf/2770fact.pdf
    Benozic acid - think Eemerald Kemala may be selling a registered Benzoic acid but pretty sure it’s enough a preservative here.

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