belassi
Forum Replies Created
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You never took basic chemistry class at school? Never did physics (measurement of an object’s density)? Google it.
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Sodium Ascorbyl phosphate, Dilfre. I use a more stable form, sodium ascorbyl palmitate phosphate, but it costs $2400 per kilo.
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T/K is temperature in Kelvin. I wish people would use a more straightforward system, I have no idea what they mean by “1.40 mass% water” it is nonsense. Do they mean 1.4 grams water + 1 gram anhydrous??? There are much plainer ways of putting this.
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If you think alcohol smells bad, you’re using the wrong alcohol. Ethanol smells fruity.
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If you place a batch in a graduated cylinder and observe the relative quantities of the 3 layers then compare to your formula, you should be able to get a good idea of what’s happening. I suspect you have layers of vegetable oil, silicones, and water.
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1. Probably yes.
2. Not critical.
3. No.
4. Really depends on the final pH. If the pH is around 10 then a preservative will not be necessary. -
Degradation of vitamin C.
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All my emulsions are based on combinations of cetyl alcohol and glyceryl monostearate, or cetearyl alcohol for the low-HLB side, plus either polysorbate or PEG-7 glyceryl cocoate for the high HLB component. Lately I prefer PEG-7 GC.
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In my city, Monterrey, I have at least half a dozen factors who I can buy basic components from (such as the one mentioned) and there are other factors in Mexico City and Guadalajara where I can source the rest. I also import special ingredients from the USA and China. The problem with making a list would be that it necessarily is country-specific and also, it would go out of date pretty quickly.
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Just buy one or the other.
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Our current price in Mexico for glyceryl stearate is around $2USD/kilo in small quantities.
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What’s the 2% PEG-7 GC for?
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“this time the powder I bought is not water soluble”
- why did you expect it to be? SA is not soluble in water. Did this not lead you to wonder just what on earth you were buying previously? -
a spray bottle produces an aerosol, it is merely a synonym of mist.
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Considering: this is a spray bottle; both ingredients are already preserved adequately with a mixture of benzoic acid and sorbate; I would only add a small amount of preservative. The lactic acid in the lavender water is to ensure the pH stays within the effective range of sorbate so check that the pH <= 5.5 in the final product.
Your idea of Germall Plus, I don’t agree with because of “Not for use in products intended to be aerosolized” according to the site. I suggest adding 0.2% sodium benzoate and ensure pH is less than or equal to 5.5 -
It’s a complicated topic and one that I doubt my own knowledge in. If I make any errors in this explanation will someone please correct me:
Dilfre, ionic compounds, when added to water, differentiate into their (charged) ions. I’ll use sodium chloride and sodium hydroxide as examples but the same principle applies to acids as well as bases.
So for instance when you add NaCl to water, the compound splits into its ions Na+ and Cl-. This causes the heads/tails of the surfactant to align into micelles, and the size and shape of the micelles determines the viscosity.
If instead of NaCl you add NaOH, the ions are Na+ and OH-; however, adding NaOH, a strong base, generally causes a neutralisation reaction with one or more other components.
(As an example, my primary surfactant in one shampoo is laureth-6 carboxylic acid. I have to neutralise it (otherwise the product would be horribly acidic) so I add NaOH. The output will be laureth-6 carboxylate + water. This is not a thickening reaction however)
What makes things worse, and I am not sure from your post if you’re aware of this, is that different ionic compounds compete for solubility. For instance it is very difficult to dissolve even a small amount of salt in a solution of NaOH or KOH. The strong base binds so tightly to the water molecules that it doesn’t want to allow an interloper substance.
If (you don’t specify) you are adding citric acid, then you will get citrates formed which are also salts that may or may not bind more tightly than NaCl. -
I don’t know if ALL electrolytes modify viscosity. Ionic compounds will.
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6 isn’t low pH. It is all about how the ionisation works.
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You can not adjust pH without changing the percentage of ions in solution, that is what’s happening.
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Tubes have poor visual appeal compared to a high quality jar or airless pump bottle with top quality labelling. There is simply more visual space. Also, tubes tend to have - in my opinion - a more downmarket image. Great for low cost products because it is a low cost package, but when I want to market a $50 Vitamin C cream it’s going in an airless pump with gold foil label, inside a cleverly designed box, with its own explanatory leaflet. Not a tube.
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So does that mean that benzyl alcohol is not permitted in Europe? Or limited to a %? Or -
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So what should we call a system such as Kem Nat? Something like, “self preserving”?
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We have many options but they are going to cost more.
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where did you find that, Etsy? No emulsifier system and where is the preservative? Hopeless.
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The new site is pearandpeach.com
It’s nearly complete but we still need all the product photos which in turn depends on the completion of the redesign and printing of all the labels and packages.