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PEG
Hi,
Im pretty new to the cosmetic industry. Trying to learn as much as possible about formulating and the thinking/science behind it. Thisi s a great forum. I hope one day to become as skilled in this field as many of you seem to be. What is the best way you gained technical knowledge?
Okay so my formulation related question. How do you tell what the difference between all the pegs are for example Peg-14 Dimethicone, peg 120 methy glucose dioleate, peg 150 distearate. I am sure there are many more there. Like which peg is good for what reason.
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26 Replies
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The best place to start is to read the supplier literature - the brochures the chemical manufacturers use to persuade chemists to use their products.
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I would highly recommend reading the “INCI Nomenclature Conventions” as a new cosmetic chemist (in particular Alkoxylated Materials). I found it very useful myself. It will give you a greater understanding of what you are actually looking at.
PEGs under a MW of 600 are liquid at RT (PEG-12 and below). Above PEG-12, for the most part all of the PEGs will be solid. The higher the number, the more substantive feel you will likely get from it. All PEGs are non-ionic and water soluble (for the most part) with lower MW PEGs being the most soluble. But, as @bobzchemist said, you really should read the literature on each one. Varied substrates can be modified with PEGs and it makes a drastic difference on their overall properties. Another source about PEGs that I suggest reading is “Polyethylene glycols and the pharmaceutical industry.”
Finally good luck and hopefully this information is helpful to you.
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@gfeldman wonderful input.
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I agree, @gfeldman, that was really good.
For supplier lit, it’s sometimes hard to find - you need to know how. (Of course, if you are on Innovadex/Prospector or SpecialChem, this is a bit easier - just look there.)Take Peg-14 Dimethicone. A quick Google search tells us it’s also known as ABIL B8843, and it’s sold by Evonik.Next, we go to a great source of information - the PCPC International Buyer’s Guide.We’re trying to find out if any other manufacturer makes this chemical.I got these results:Ingredient Name Supplier Name PEG-14 Dimethicone (INCI) Evonik Industries AG Glenn Corporation Universal Preserv-A-Chem, Inc. Since I know that Glenn and UPI are distributors, I know that Evonik is the only manufacturer.
Go to their website: http://personal-care.evonik.com/product/personal-care/en/Pages/home.aspxand search for PEG-14 Dimethicone.or, google ABIL B8843.I got http://www.finecon.sk/admin/pdf/DS_ABIL_B_8843_e.pdf, which has some good info.Not all supplier lit is online. You will either need to go to a trade show or make many phone calls to get everything you’ll need. -
Thank you all for the great information! Really helps to put things into prospective
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when you see peg wwith other names for exampe peg-12 dimethicone , it means that dimeticone molecules are located on carbon atoms in PEG.
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and the number is related to molecular weight. it means that with higher number the molecular weight is higher, the viscosity is higher.
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@nasrins how does this ethoxylation effect the hydrophobic/hydrophilic aspect??? Is ethoxylation directly proportional to ease of aqueous solubility or other factors play important part too to determine the tendency of the molecule?????????
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dimethicone is non polar , so with grafting it with PEG we make it soluble in water. absolutly PEG affect the solubility of silicone compounds.
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@nasrins so why PEG 40 Hydrogenated Castor Oil is readily soluble in water compared to PEG-150 Distearate (forget the physical state)
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u say hydrogenated, it means that OH groups arefar more copmared to peg-150 Distearate.
u say I thought wrong?
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OK now PEG-12 Dimethicone to PEG-150 Distearate????
No you are not wrong, I am just trying to understand the concept here. -
ok, whats your question?
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Why PEG-12 Dimethicone has better solubility compared to PEG-150 Distearate?????
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I think molecular size in peg-150 is bigger and solubility decreased. ya?
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You mean the MW is of 6000 compared to 600??????????
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i just to say that PEG-12 is used for increasing the solubility of dimethicone.
I dont have any idea about PEG-150 Distearate. I only gues that PEG-150 Distearate has large molecular size so solubility decreased.
whats your idea?
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You are comparing apples to oranges…
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@Bobzchemist Thats what!!!!!!!!!!! So higher degree of ethoxylation doesnt mean higher aq. solubility?????? Depends what is being ethoxylated???????
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@Bobzchemist I agree
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@milliachemist - Think of it this way. The base molecule has a certain solubility in water. When you add PEG it increases the solubility.
So PEG 12 Dimethicone is more water soluble than say PEG 8 Dimethicone but less soluble than PEG 20 dimethicone.Similarly, PEG 8 Distearate is less water soluble than PEG 150 Distearate.But it makes no sense to compare water solubility of PEG 12 Dimethicone to PEG 150 Distearate -
@Perry great one.
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@perry excellent.
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@Perry BTW this site of yours is pure dope, even FB pales before it. Did you know it is highly habit forming??????
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@milliachemist - lol
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