chemicalmatt
Forum Replies Created
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How bout just using more silver ion as silver chloride - a preservative in itself?!
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smok, your distributor may stock “cetyl esters”, which is essentially the same thing. Stearyl Stearate may be a Plan B. If you cannot get either, then you may be out of luck with any suitable alternatives. That ester grants a powdery afterfeel to creams and lotions on dry-down. Pretty useful material for your formulating toolbox. Good luck.
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No reaction, dude. Substitute another Na+ ion for the proton in bicarbonate and you have the carbonate. Why use bicarbonate at all is the question?
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You need to vet your contract manufacturer (CM) to know their inbound inspection procedure. Should they determine your bottles to be in a state of non-conformance, they will HOLD and notify you. These are blow-molded at high temp, so as long as they packaged correctly and didn’t store outdoors or in a yurt on the steppes, your bottles should be fine.
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We’ll assume you are referring to lemon oil (d-limonene) “to solubilize.” Your final pH does not need to be acidic, so don’t bother, plus potassium sorbate isn’t needed - but tetrasodium EDTA is! Better yet, raise the pH to 10 - 11. As far as stickiness goes, add an amphoteric hydrotrope like disodium cocoamphodiaceate (along with that EDTA); will help with that solubilizing problem too.
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How about just adding a lot of caramel? Cheap and easy: a skin colorant rather than skin lightener? That formula of yours will need a lot of work, though: another story altogether.
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Glucosides notoriously crash guar gum and cationic guar. Change out those surfactants as Mark suggests and you’ll see better stability.
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C12-15 Alkyl Benzoate will work there.
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EDTA (Na2?), sodium benzoate - all those electrolytes, its amazing it stayed together in the first place. Friends don’t let friends use electrolytes in the same formula as carbomers or any other acrylate copolymer. Drop those and your goop will stay together a whole lot better. Adding 1% stearic acid won’t hurt either as ngaryev suggests. That is a lot of TEA for 1.0% Carbopol.
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Affirmative, but not as much.
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All that bentonite is zapping up all your water there. Use a more inert clay like kaolin and you might also add butylene glycol to retard dessication.
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I can’t see Polyqyuat-10 fully hydrating when adding at the end, especially the high MW stuff. ALWAYS add into water only at RT in the first step, mix well while gently heating until fully dispersed and hydrated before adding any other ingredient. Same is true for virtually all polymers and resin gums. Another factoid regarding Polyquaternium-10: do not add chelant (EDTA) to your water before adding/mixing/hydrating or it will take 3X longer. Don’t know why but it does.
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To answer Perry’s original question: I know of no such research paper determining SLS as a harmful element to humans. As for the well-known irritation potential: that is so easy to formulate out of your shampoo product! Once you add counter-irritants (ISML, amphoterics, etc.) that index number comes way down. Regarding @colorfuljulie narrative - she is right. Pureology and other pro brands made claim that SLS was fading color too fast from dyed hair, and they were right. It works too well as a surfactant! That is where I remember the entire “sulfate-free” trend starting more than 20 years ago: in the pro salon and with dyed-hair customers. It escalated from there to the point where too many Chemists Corner followers believe SLS is wrong to use for the wrong reason.
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Hydroxyethylcellulose will not support monovalent electroltyes (e.g. SLS, ALS) or amphiphiles (amphoterics) in high amounts well at all. That is why your viscosity was unstable even before you added NaCl. Try methylcellulose (Methocel from Dow) instead, you’ll feel much better.
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EVchem, you didn’t miss much there. Nice job!
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Brenntag (Deutschland) would be a good place to look. Largest specialty chemical distributor in the world.
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Gaby,you experienced small imbedded air pockets rising to the surface of the product. Keep air entrainment to a minimum next time while mixing - I normally use a spatula fixed with a c-clamp as a baffle inside my beaker for this purpose.
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For terpenes, especially if they include any aromatic heterocyclics, try C12-15 alkyl benzoate as your co-solvent. Works well, easy to source, inexpensive. (Again, what CAN’T Finsolv TN do?)
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Negative.
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Usman, what ngarayeva is saying is that 1.0% glycolic acid will have no desquamation effect, you need to use >10.0% to get any efficacy, plus do not neutralize since it loses efficacy above pH 3. Also ngarayeva means if it is only in your formula as a label ingredient , just add less, or if you are using it as a pH adjuster, use only what you need.
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I agree. Hope they place a North American office/warehouse someday.
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Add it post-emulsification. As to whether stable or not: cannot say as it depends on the other components,method of emulsification, how much glycolic acid you are adding….and…you’ll find out.
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I’d suggest hydroxypropyl guar (cheap as long as the frackers are not using) or even technical grade xanthan gum to suspend that much chalk. Rule out carbomers, since even though calcium carbonate has slight solubility in water, divalent ions will crash. What surfactant to use (“wetting agent”) all depends on your application. When in doubt, use a nonionic, e.g. polysorbate 60.
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Good point, and amine oxides are underrated builders in personal care I might add. Peroxide stability = hypochlorite stability. Let’s just say oxidizer stable - and watch out for those Carbopol analogs too.
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Pharma: no I have not. Curious.