ozgirl
Forum Replies Created
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I have used The Body Shop Vitamin C Skin Boost Instant Skin Smoother in the past and it gives a matte finish that smooths the look of the skin. It is a silicone based formulation with no water.If you want to have the matte effect you may need to move to a silicone based formula. -
@sands I have had good experiences with the Euperlan pearlescents from BASF.
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The stability of a pearlescent is influenced by the viscosity and density of the liquid and the particle size of the pearlizer. You can read up on stokes law for more information if you want the science behind it.I have always had better luck using a commercial pearlescent than trying to add EGDS.
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You can always look around for a second hand Brookfield viscometer as a cheaper option. When labs or production facilities close down they often sell off the equipment.
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Gel candles are made using a blend of mineral oil and a thermoplastic resin.What is your application? There are products made by Lonza (ViscUp) and Ajinomoto (EB-21 & GP-1) that are used for thickening mineral oil for cosmetic applications.
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EDTA is often used to enhance the efficacy of your preservative. So you may want to add it in any case.
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Are you referring to Iselux Ultra Mild (surfactant blend) rather than Iselux (Sodium Lauroyl Methyl Isethionate)??If you are using Iselux Ultra Mild you could try to decrease the concentration to arount 30% as Innospec suggests that the typical usage rate of that product is 25 to 30%. This might make the shampoo a little less cleansing but result in a more conditioned feel.Not sure what samples you are getting but you could try some quaternized
proteins (rice, wheat, soy etc) for a potential conditioning effect.@Max - Isethionates are considered sulfate free, they are however not sulphur free. -
Thanks @DAS . Interesting article.I wonder if the CAPB could be working in conjunction with the disodium cocoamphodiproprionate to give this antimicrobial behaviour. The shampoo sample that I sent previously didn’t contain the disodium cocoamphodiproprionate so could be reason that I see this behaviour for these samples.
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@Chemist77and @Sibechthanks for your thoughts. The fragrance was at low levels so it is probably not the reason for the preservation. I think I will contact Schulke and get their input.
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You probably won’t find a comprehensive source for all emollients but here is a chart from BASF that is a good starting point.I think Croda has a similar one.
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There are a number of problems here.1. This is not a shampoo bar formula - It seems like half of a soap formulation (with no sodium hydroxide) with some mysterious “sodium cocoyl” ingredient added.2. What is the full name of the “Sodium Cocoyl” you are using? There are many ingredients starting with “Sodium Cocoyl”. Sodium Cocoyl Isethionate? Sodium Cocoyl Glutamate? Sodium Cocoyl Sulfosuccinate?3. What are you trying to create here? A soap bar for washing hair or a syndet shampoo bar?I would recommend joining swiftcraftymonkey’s website for some good starting formulations (https://swiftcraftymonkey.blog) for shampoo bars.
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Try using LABSA to adjust the pH down if it is too high.
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I have never had any problem with precipitation when neutralising LABSA with NaOH when making detergents and dishwashing liquids. However it can look milky if you have not got the ratio correct.We add the NaOH to the water and then add in the LABSA.
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The third ingredient in their ingredients list is “Advance Moisture Complex” which is definitely not correct the INCI listing.Incorrect ingredients listing is always a red flag for me.
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It is most likely that the CTAC (cationic) is incompatible with the anionic potassium stearate that is present in the GMS SE.
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@Gunther It is easier to handle and you don’t have to ensure that it is dissolved.
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Increasing the ethanol should help increase the solubility of your fragrance and allow you to reduce the amount of solubilizer that you need.Keep in mind that this might make the product Flammable.
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I would guess that they use water because it is cheaper than alcohol. The water would also be required for the carbomer. It actually looks like a formula for a hand sanitiser.I think the propylene glycol could be used to make the fragrance longer lasting.
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This info might be useful as a starting point.Ultimately the amount required will depend on your particular DDBSA. Don’t forget that DDBSA contains free sulfuric acid that also needs to be neutralised.I would recommend using 50% NaOH solution for neutralisation rather than using flakes.
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Maybe look for solid shampoo formulas for ideas. Have you also considered Sodium Cocoyl Isethionate (SCI) and Sodium Lauryl Sulfoacetate (SLSA) as surfactants. I would also recommend adding some amphoteric surfactants to improve mildness.
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@formul8101 I have just sent samples to Schulke recently for Koko testing. So yes they still do it.I’m not sure where you are located but check with your Schulke distributor. In Australia they prefer the samples to be shipped from our distributor so we just send the samples to the distributor and then they forward them to Schulke.
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You are probably having issues finding someone to formulate this type of product because of the potential issues and negative attention that other aerosol sunscreens on the market have received. (People don’t want to be sued).I know that the Australian Cancer Council no longer recommends the use of aerosol sunscreens and there have been many reports of people being sun burnt when using this type of product. It is difficult for users to ensure complete coverage with these products and unfortunately even if your product passes all the testing you still can’t control how the consumer uses the product. There have also been issues in the past with the flammability of these products.Not trying to discourage you just letting you know why you might be having trouble finding someone.
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What is the purpose of the Triethanolamine? It is reacting with the stearic acid to form an anionic surfactant which is not compatible with the cationic surfactant.
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Ethyl alcohol smells much better than isopropyl alcohol so I would definitely start there.Ethyl acetate is used as the main solvent in non-acetone nail polish removers and does not smell great.
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@Max I am in NSW Australia.