Forum Replies Created

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  • em88

    Member
    September 6, 2023 at 10:51 am in reply to: Why has shampoo/conditioner gotten so expensive?

    I have personally visited manufacturing sites and even tried these inexpensive shampoos (not limited to shampoo products alone). The volume discount does have a limit. Pantene and other massive brands like it also operate at high volumes. I’m fairly certain they already secure the lowest prices for their raw materials too. There are indeed cases where the same product is marketed under different brands, with pricing determined by the brand’s strength. This is true; those products are nearly identical.

    • This reply was modified 7 months, 2 weeks ago by  em88.
  • em88

    Member
    September 6, 2023 at 5:16 am in reply to: Shampoo formulation

    “Another question is, why everytime i make formula that consist SLES (Texapon) and HEC, the final product always separate after 1-2 days?”

    HEC is not compatible with SLES.

  • em88

    Member
    January 30, 2023 at 7:22 am in reply to: Natrosol/HEC not working well

    Carbopol ETD 2020 should handle that amount of NaCl. 

  • em88

    Member
    January 27, 2023 at 2:09 pm in reply to: Natrosol/HEC not working well

    blueberry said:

    Carbomer is next. Siligel is separating in the past 2 days.

    Carbopol ETD 2020 is a good option in this case

  • em88

    Member
    January 23, 2023 at 8:26 am in reply to: Natrosol/HEC not working well

    HEC is not the best choice for other surfactants as well. 
    HPMC, xanthan gum, and carbomer are a few alternatives

  • em88

    Member
    January 17, 2023 at 3:08 pm in reply to: Cholesterol melting temperature

    It will dissolve in your oil phase.

  • em88

    Member
    January 6, 2023 at 8:55 am in reply to: Emulsifier quantities

    Shouldn’t the quantity of Polysorbate 60 be higher than the quantity of Sorbitan Stearate?
    You are right about the antioxidant. 
    My guess for polysorbate 80 is that it is added as a wetting agent for ketoconazole when it is dispersed in water. After that, the suspension is added to the base cream. 

  • em88

    Member
    January 4, 2023 at 1:10 pm in reply to: New cosmetic trends for 2023 and beyond

    Perry said:

    4. The Rock (Dwayne Johnson) will launch a beauty product line. (maybe hair treatment for the bald head)

    Anyone have any more?

  • em88

    Member
    December 15, 2022 at 10:33 am in reply to: Sephora Sued Over ‘Clean Beauty’ Claims

    Pharma said:

    What the heck… I’m speechless from all that stupidity (mostly because that lawyer, dumb as he/she might be, most likely earns 10 times as much as I do)!

    And if I’m not wrong, you are based in Switzerland, where most likely you earn 10 times as much as we pharmacists make in the EU   :smiley:

  • em88

    Member
    September 23, 2022 at 9:14 am in reply to: New to Formulating - Creating a gel cream

    Do you really need the soaping effect?
    Since you are a beginner and already familiar with Seppic products, I’d suggest you use Sepineo P600. It is suitable for cold processes. You will not need RitaMulse and Sepinov EMT 10 if you use Sepineo P600. 

  • em88

    Member
    September 12, 2022 at 11:38 am in reply to: PVP K series | know your Raw Materials

    Three minutes are not enough to talk about PVP in general. This was more like an ad.

  • em88

    Member
    August 25, 2022 at 7:29 am in reply to: Cocamide DEA & Cocamidopropyl Betaine (Incompatibility)

    At what temperature are you adding them?
    I would decrease CDEA at 2-3%, and increase the quantity of PEG-150 Distearate to achieve the desired viscosity.

  • Depends on the product. Can’t you measure the density of the finished product? 

  • em88

    Member
    February 4, 2022 at 6:16 pm in reply to: Sodium Lauryl Sulfate and Sodium Laureth Sulfate (27% x 70%)

    We only sles, both concentrations 27% and 70%. I’m not so sure about the prices you get, but for the quantity we buy, the price for sles is way too cheap to be considered.
    If you are using small lab equipments, I’d suggest to go for 27%. It will make the process easier and faster. Sles 70% needs time and temperature to be dissolved in water. If you force the dissolving process, you will have to deal with foam. 

  • em88

    Member
    February 4, 2022 at 12:54 pm in reply to: Urea

    Pharma said:

    @chemicalmatt Why are people so often promoting lactic acid / sodium lactate as a buffer for urea? It’s no longer buffering at that pH range, let alone preventing the product from a rise in pH which is the main issue with urea.

    I agree with you. LA/SL will not help

  • em88

    Member
    January 30, 2022 at 7:32 am in reply to: Paraffin hair oil thickener

    I’d really suggest you to read much more before preparing any product. At least read about basic knowledge, before hurting yourself or someone else. 

  • em88

    Member
    January 5, 2022 at 3:29 pm in reply to: Stability of Urea in Cosmetic Formulations

    Pharma said:

    He’s referring to triethyl citrate. It’s not an acid but a tripple ester of citric acid with ethanol. Once pH increases, it hydrolyses turning into citric acid. This in turn brings the pH back down (and also stopps hydrolysis).
    w/o emulsions also have a pH which can (and will) drift when using enough urea. Unfortunately, there is no benefit from using this type of emulsion when it comes to stabilising urea. I tried making w/o emulsions with 40% urea… was fun but didn’t work out (emulsion instability, not chemical instability). Urea is the same b*+ç# as always and heavily interferes with HLB/HLD calculations/estimations and oil phase integrity/stability.

    I have read a few articles about using triethyl citrate to stabilize urea. I would give it a shot. Do you have any suggestions regarding any ratio TEC/Urea?

    Thank you

  • em88

    Member
    October 14, 2021 at 3:16 pm in reply to: How many active projects should a Cosmetic Chemist have at a time?

    It depends on how deep your research goes. Considering that you are talking about cosmetic products and that you are alone in the lab, one product a month is feasible. 
    Reverse engineering is a fancy way to say formulating a generic cosmetic product. 
    Tech transfers are usually easier to do, but it depends on how robust is the formula. 

  • em88

    Member
    October 1, 2021 at 7:47 am in reply to: 15% Urea cream - Crystals forming in the tube opening

    @Padmavathi, Well,  what do you mean by stable? 

  • @em88 there’s a couple of tricks: if you don’t need more than 10% go for water in oil. Then pH doesn’t matter. If you need it be be oil and water and or at high concentration, keep pH at 6, add lactic acid buffer and predissolve urea in propylene glycol (60c). Arlacel 165 is a good choice of an emulsifier. 

    Indeed in W/O emulsion pH doesn’t matter, but that doesn’t mean you don’t have to stabilize urea. It is even harder to see if urea is stable in W/O emulsion for that reason. While in O/W emulsions, the buffer will maintain the pH stable, but from my experience, the appearance of the cream changes over time. It will get bubbly. My guess is due to CO2 being formed. The only solution I see in higher concentrations is to remove water completely and formulate anhydrous emulsions. 

  • em88

    Member
    September 30, 2021 at 2:12 pm in reply to: 15% Urea cream - Crystals forming in the tube opening

    I’m actually surprised the product is stable at 40 C 75% RH and 50 C. 

  • em88

    Member
    September 30, 2021 at 1:30 pm in reply to: Would this toothpaste require a preservative?

    You should never guess to add or not a preservative or to guess the efficacy. You have to test it! Indeed you have a lot of glycerin, you can test your formulation as is, but you should as well consider adding a proper preservative. 

  • em88

    Member
    September 29, 2021 at 8:45 am in reply to: Dissolving salicylic acid

    suswang8 said:

    em88 said:

    zetein said:

    Using sugar alcohol to dissolve salicylic acid is quite novel. Would you mind sharing your experience?

    It’s probably confusing. By sugar alcohol I mean polyalcohols such a glycerin, but also propandiol, butandiol and so on. I believe it’s understandable that blends of alcohols, polyalcohols and PEGs have better dissolving properties compared to each of them alone.
    Thanks for pointing it out, and letting me explain it better. 

    Salicylic acid is soluble in glycerin?  I had not heard this before.

    You don’t have to hear it, you only have to think. 

  • em88

    Member
    September 29, 2021 at 8:15 am in reply to: How to thicken a shampoo formulation and maintain excellent performance

    Why did you add cocamide dea?
    As Stanley said. Carbopol aqua sf-1 should do the trick. What viscosity do you need? 

  • em88

    Member
    September 6, 2023 at 5:24 am in reply to: Why has shampoo/conditioner gotten so expensive?

    I’m pretty sure that cheap shampoos are cheaply made. they don’t have the best formulation or the best quality control. It is safe to assume they are cutting costs from somewhere or everywhere.

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