David
Forum Replies Created
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@BartJ
I interpret the regulation as Article 15.2 can be overruled if enough evidence exist to declare the ingredient safe (or rather the end product safe containing that that ingredient)
Opinion SCCS/1249/09 clearly states that the sodium borate is safe under the restrictions laid down in Annex III.
I have a (small) client in a EU country that has to withdraw their products from the market due to sodium borate (<0,5% in a cream). I believe that is unfair. Moreover LUSH (UK) uses sodium borate as well.
Annex III has also remained unchanged. IF sodium borate is banned it should be listed in Annex II (at least after a while). Don’t know how to help my client. I have Emailed the EU, but no answer so far. -
this could be an option. (haven’t tried it though)
https://www.dr-straetmans.de/en/products/dermofeel-viscolid/ -
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you can’t - you need a co-emulsifier with a lower hlb
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@Bobzchemist You mean the shelf life, 8 weeks, is how long their microbes “live”? - then they should be safer after 8 weeks?
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Sephora doesn’t use glycerin, so why not try another solvent? Then you’ll probably have the answer..
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Thanks @Bill_Toge, I have the feeling many raw material suppliers are ignoring this, especially when it comes to mixtures or extracts containing alcohol, or are they all using “duty-spirit” ?
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I think we are getting closer every day to cosmetics stored in our refrigerators next to food. In that case they should be tested the same way food is. I am not an expert in microbiology but 8 weeks sounds to me like a very strange shelf life, since if the product is prone to bacterial contamination it usually goes much faster - if not-it goes much slower.
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If you can record the temperature 24/7 it would be good enough. However, it is easier to buy an incubator. I don’t live in the tropics….. but maybe you should also check that the temperature doesn’t go to high?
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Hi @BartJ -these are indeed 2 competing mechanisms and it may even be they cancel out @ the end. Somebody would have to do a half half test with damaged hair on one side to find that out. Best would be to have two conditioners. One hair mask loaded with quats and maybe some silicones, and one lighter for everyday use so you don’t get buildup.
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In my opinion, unless you have a special interest or see it as a fun hobby to make cosmetics, household detergents (or degreasers) yourself, there is no use doing it. It takes a lot of time to develop and @ the end your formula is probably more expensive than at the supermarket anyway.
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Yes correct-to measure pH of a product-use a pH-meter. If you have to dilute your cream to be able to make a measurement, you can’t claim your cream has a certain pH - only the dilution of it.
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If is it normal or not - why not just try a couple of popular shaving creams and find out? If you want foam - use a surfactant - I would try SLS or SLES @ low percentage.
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carbopol ultrez 30 works from pH 4 according to Lubrizol.
Why is hexylene glycol hard to find for you? It is a very common chemical, you can even find it on Amazon. -
@Bill_Toge - good point!
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Depends on your definition of “face oil”. If you make an oil mixture - you need only oils. However, if by face oil you mean a facial cleanser, you’ll need a surfactant to remove dirt / make up.
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Agree with @Bobzchemist - all these “do I need a preservative when” questions - are a bit like asking your driving instructor: do I need a seat belt when driving 30 km/h…
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Yes you can combine preservatives, it is not so common however since suppliers usually have lots of effective combinations already available. Regarding the synergistic effects between the two preservative mixtures you mentioned there is no simple answer unfortunately. You need to set up an experimental design in order to find an optimum ratio/concentration.
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water + carbomer
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This is a quite tricky product to dupe for a beginner. Try starting with a water based hair gel instead. Here’s a formula
https://chemistscorner.com/cosmetic-formulation-basics-styling-gel/ then add the PEG-90M -
You need to explain what you mean with “best”.
cheapest? most stable?. If you expect a benefit for the hair in a rinse off product - none of the three will most likely have any. -
There is nothing such as “perfect percentage” in a shampoo. It depends on many factors. Price, raw material availability, consumer expectations, marketing, other ingredients, stability etc etc. What @Perry mentioned is a starting point.
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BASF has a nice table called “choosing the right emollient” - where you can compare different properties, (don’t know if the link work @ your location though.)
https://www.ulprospector.com/documents/1167285.pdf?bs=804&b=78574&st=20 -
I am not sure I understand your question, but the “Omega 6” is listed is due to marketing reasons. Linoleic Acid is an omega-6 acid (C-C double bond in the n-6 position)
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Polyaminopropyl Biguanide @1,5% ? - It is not even considered safe @0.3 SCCS opinion. SCCS states it is irritating to the skin as well.