Bill_Toge
Forum Replies Created
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the powder form of sodium lactate is very hygroscopic; concentrated solutions, which are typically about 60% w/w, are easier to store and handle
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somebody might be able to, yes
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try adding the ingredients one after the other, instead of mixing them together
what preservative are you using?
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the main offenders are highly soluble ethoxylated surfactants, e.g. SLES, and they reduce the efficacy of Euxyl PE9010 rather than being outright incompatible
I’ve often used it with less soluble ethoxylated surfactants (ceteareth-20, oleth-20 etc.), sometimes up to 25% w/w, and never had a problem with it
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if you get a cottage cheese consistency after neutralising your carbomer, that does suggest, again, that your batch is not fully mixed
what it shows is that some parts of the batch are becoming thicker than others, and the fact that the carbomer has been neutralised means the thin and thick parts can’t mix together (because the water phase has been gelled, and cannot flow except under shear) - if it’s fully emulsified, then any changes in viscosity will occur at the same rate throughout the batch
also, AMP is not a polymer at all, it’s short for aminomethyl propanol
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you’re adding the water phase to your oil phase near the drop point of the solid materials, so it’s likely that the batch is not being mixed properly
I’d suggest adding the water phase at at least 65°C, to ensure everything is fully liquid
also I agree with @ZivBA about the carbomer; it needs to be neutralised
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based on what you’ve said in the other thread, I reckon it’d be better for you to seek opportunities at another company
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what kind of product is it, and what’s in your formula?
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it depends on what kind of company you work for, and how much lab work the chemist’s job involves
if the role is largely lab-based, then yes, it is a normal and sensible approach to start as a technician; when it comes to learning how materials and formulas work, nothing beats actual hands-on experience, and it is the kind of experience you can only get in the workplace
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if the fragrance is separating it’d rise to the top, rather than fall to the bottom
could you show us a photo of this precipitate?
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in a product like this there’s very little difference between palmitic and stearic acid, so the two are pretty much interchangeable
also if it contained palm oil, it would be listed as “Elaeis Guineensis/Elaeis Oleifera (Kernel) Oil” or something similar, rather than being broken down into its component parts
this is mainly to keep the ingedients list simple, and also because the exact composition of the oil can’t be guaranteed from batch to batch
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that effect is created by adding a high molecular weight polyethylene glycol resin, e.g. PEG-90M
it won’t work in an oil-based product, because the resin won’t hydrate; you’ll have to incorporate it into a water-based formula
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your suppliers are mistaken; if you combine anionic and cationic surfactants (as you’re proposing to do) they’ll precipitate and become totally ineffective
salicylic acid works well in handwash as an anti-bacterial agent
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@22tiare@gmail.com you need to start a new thread
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you can measure viscosity with a flow cup; it’s about the simplest method there is
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it also makes preservatives more effective, by helping break down the cell walls of microbes
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what are the pigments made from?
also: are the pigments powders themselves this sensitive, or do they just fade in the finished product?
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I used to work with someone who was allergic to various grades of Jaguar (guar hydroxypropyltrimonium chloride), so it could be that
in my view 1% is a bit excessive; you’ll get perfectly good results with 0.3-0.5%
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I strongly suspect it’s contamination of some kind
myristyl myristate is not reactive enough to undergo susbtantial hydrolysis or reduction in air, even over seven years
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I’ve asked them whether or not their products are registered with the MHRA (medicines authority in the UK), and if so, what are the product license numbers
because, believe it or not, I can’t find a trace of them on the MHRA’s website!
probably won’t get a response, but it’s definitely worth asking the question instead of going straight to Trading Standards
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it would be considered a medicine in the US, but not in Europe
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dimethicone won’t mix with the rest of your ingredients - I suggest you take it out
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some of them look like unlicensed medicines too!
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about that graph, x1 is the mole fraction of water in a water/alcohol mixture, and xA is the mole fraction of trehalose dissolved in that mixture
the graph shows that trehalose becomes completely insoluble when the mole fraction of water is about 0.04-0.05, i.e. about 2% water/98% ethanol, which is probably not helpful!
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no, they’re entirely optional
the safety assessor usually extrapolates this from the raw material data