chem.ist
Forum Replies Created
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There might be polarity differences between the oils you are using which can cause this, or even large differences between the melting points of ingredients.
So using something like silica can help swell the oils and reduce sweating.
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Hi!
I’m a new formulator as well but this is how i normally start a formula.
Add thickener to water first. In this case you are using gums, id SLOWLY add these to the water if you are not premixing them with a humectant like glycerin or propanediol. If you do decide to premix you’ll see that it will disperse and the mixture will be more homogenous without having chunks. (Since youve been premixing the preservative, you dont know if thats the issue bc you havent seen how the thickeners work on their own)
Once you see how the thickeners work on their own, you can decide to increase or decrease the concentration based on your desired viscosity. After that you can see if your other ingredients increase or decrease the viscosity of your product as well. Some thickeners are responsive to changes in pH, you should be fine with xanthan gum, im not sure about the other. I have had issues with preservative compatibility in the past where you make a great thick moisturizer and then once you add the preservative at the end, it breaks the whole formula nad makes it runny or chunky.
Hope that helps!
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Thanks for you response! unfortunately the client wants 2% fragrance and its not negotiable. I will try to remove the propanediol or add some anionics
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yes, the TEC wont fully dissolve in the water. once I remove it, I see no issues.
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range between pH 4-5
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Thanks! The clients old formula has a powder that caused issues in stability. Ive tried tapioca, arrowroot, conr starch, rice powder, some powdered waxes but they all create a skin on the top of the blush that you have to break or it dries out the blush too much.
Any tips on preventing that?
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correct! the issue is keeping the viscosity when that specific fragrance is added, all of the others dont have effect on the viscosity. What do you mean by fragrance clarity?
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Yes! So the client has different fragrance options and all of them worked and did not decrease the viscosity even at a lower pH, except for one of the fragrances. This happens to be their favorite so I do need to figure it out. Ive been using the carbopol aqua sf1 with no issues at low pH but I will try their sf2 version to see if it works out. Without the fragrance the viscosity is perfect. With the other fragrances the visc is perfect. Just the one fragrance is messing everything up
