chemicalmatt
Forum Replies Created
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Never heard of any here in the USA, but if you have a standard filter and moisture trap on the line you ought to be OK. I assume you are using air for a pressure-filler with bottles? Moisture is the nemesis!
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Aloe vera gel is not peroxide stable either. So many are making that mistake its driving me bonkers. Both @ketchito and @Rockstargirl are counseling you well here too.
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GMS itself will be peroxide stable to some degree depending on your H2O2 content. The linear alkyl ethers are 100% peroxide stable. E.g. ceteareth-20, steareth-2.
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Smell the headspace of the swelled bottle. I suspect you are getting acetic acid there from decomp of all that glyoxylic acid. You really need a buffer there too. BTW, what the heck is “mono”?
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You do not have to follow those guidelines, they are only that: guidelines. The 100 cfu/ml limit is the general standard for USP<61> TPC of cosmetics. If you can live comfortably with those limits of yours, go with it. RO water systems are notoriously susceptible to biofilm buildup too. Backflush with peracetic acid solution and you may see better results.
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Mystery there. Nothing jumps out at me and everything appears to be miscible. Perhaps add a bit more amphoteric and see what occurs. That is the hydrotrope here.
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From your listing it appears you are using Seppigel 305 as thickener. This rheological does not hold up well with electrolytes. SODIUM PCA is an electrolyte. Reduce or remove and its all good. Also: cera alba (beeswax) is your sticky thingy. C12-15 alkyl benzoate usually mitigates this, so perhaps less beeswax, and more ester will reduce the tack.
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Yes indeed: just add it directly to the shampoo after all the surfactants are in, preferably above 45C. There is a limit to how much glyceryl oleate your formula will absorb before viscosity crashes however so go low and go slow.
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I’ll bet “SoapyGuy” Dennis can answer all those recurring questions regarding LABSA and K-Cocoate and glucosides formulation better than anyone. I’ll encourage participation by all.
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The 25% salt content is doable, that highly acidic pH not so much. Colloidal clays (laponite?) may be able to do the job, but experiment is needed. Should you find success please share with the group.
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@aquariustye Welcome to the Vortex of product design. We hope you find it rewarding more than you do frustrating; and let us know how to help.
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@okaforify I’d call this well preserved given the water activity, as long as the final pH is <5.5 or that sorbate won’t do much good. A bit heavy if anything. With clay products it is always best to add the preservatives before the clays. Kaolin and other clays may adsorb certain preservatives such as benzyl alcohol.
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Right on, @Pattsi . C12-15 alkyl benzoate: as I always say what CAN’T Finsolv TN do? I’ll also remind of the ‘ol lecithin trick. A little bit of lecithin and most lipids start to play well with one another and their co-surfactant. I’ll also continue @Dr_Sara train of thought: why employ a surfactant at all? Oil cleansers are just that: oil. Maybe add just 3% TWEEN 80 to help rinse off face (and clothes) and leave it at that.
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Also known as methylsufonylmethane (MSM) this is known widely in the holistic medicine world as a joint pain palliative and other body ache cures. That’s when you ingest it, of course. Unsure what this does topically. This will be a good solvent, though not quite as good as close cousin dimethylsulfoxide.
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Aside from castor oil I do not see a pigment dispersant in here, and castor is not a very good one, plus it is the glossiest component there. Could be your problem. Add a low refractive index dispersive ester, and EVchem steered you well with the silica suggestion. That will not only mattify but help maintain the physical integrity.
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Will not work. HEC will crash and gel out of solution, as will most of the cellulosics, within an alkaline soap system like that. Klucel (hydroxypropyl- ) or cellulose gum (sodium carboxymethyl-) would be first ones to try. As for method: always disperse the resin into water first and allow to hydrate 100% before adding any other ingredient.
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Best way is to fix the fragrance oil in C12-15 alkyl benzoate, then add & mix. That ester is miscible with cyclomethicone, the base of your serum, and most fragrance oils.
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I love the suggestions by @Dr_Sara and @czkld Old School ingredients, you cannot go wrong. @ETcellphone understand that most really comedogenic ingredients are triglyceride oils and their derivatives, such sweet almond oil, grapeseed oil, decyl oleate, isopropyl palmitate. Avoid these and you should be good to go.
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@letsalcido HEC won’t do well with high levels of surfactants unless they are cationic, even then it has limited rheology, and why you may see HEC on a hair conditioner label (like @Jennycat) not a shampoo. HydroxyMETHYLcellulose is advised for shampoo, body wash, surfactant systems. See METHOCEL (Dow). It’s so safe you can eat it too. Use Methocel F4 in milk shakes to prop up foam.
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You mean formulation or application?
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@devo2 there is no measuring of pH in anhydrous products. If you can disperse your product into a finite amount of water each time, you may then capture a relative pH.
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She is very cute, @Dr_Sara and that is a cute way to learn. I’ll bet Meggy can figure a way to get branched groups into there. Even dendrites.
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Reheat to a tolerable level, usually above the PIT (phase inversion temperature), then adjust. Another easier method is to heavily dilute your acid or alkali and add very slowly to the batch while mixing is underway. This works in most cases, but tragically not all.
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Prescribed monograph level for Benzalkonium Cl is 0.13%, for Benzethonium Chloride 0.20%, but the latter is not as effective a germicide. Less than 5% of hand sanitizers in the USA use these quats; most use ethanol. As for safety: agree 100% with @letsalcido: these are meant to murder micro-organisms such as SARS CoV-II. Is that not a good thing?
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I’ll suggest reducing glycerine, q.s. with propanediol. The polyol:water ratio is right where it should be.