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Shower cream passed 3 months accelerated stability but separation in room temp after 6 months.
Hi everybody,
I need help. I have a charcoal shower cream formulation. This formulation pass all my stability test. Which are:
1) 50 deg for 1 month
2) 43 deg for 3 months
3) Sunlight
4) Room temp (as std)
However, after 6 months, when I checked back my sample it already separate. Clear solution on top and black solution on bottom.
I tried to conduct a few others different stability to know at what condition it separate but it does not separate at all. Only slight sedimentation.
The new conditions I tested are:
1) cycle stability (-10deg to 50deg for 3 cycles)
2) cycle stability (-10deg to 45 deg for 5 cycles)
3) centrifuge for 20 min, 3500 rpm
4) centrifuge for 30 min, 4000 rpm
5) double boil for 24 hours.
Is there any other testing that I can do? -
7 Replies
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that seems like plenty of stability testing to me…not aware of any others.
what are you suspending the charcoal with?
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I am using the HPMC at 0.16%.
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I’m not sure your HPMC is enough to suspend anything.
Have you considered Aqua SF-1 (acrylates copolymer)?I tried for a loooooong time to suspend particles with more natural methods but I finally gave up and went with SF-1, which works wonderfully.the only other thing that worked for me was a high amount of xanthan gum, but i had to use so much of that the consistency of the body wash became unbearably snotty.
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Quality of answers provided by yours truly and other (real) chemists are as good as the information you provide us with.
Many people are insanely secretive about the ingredients that they use and how much they use to the point as though national secret. Good luck to those people trying to get valid answers.
You seem to be one of those with national secret.
https://chemistscorner.com/cosmeticsciencetalk/discussion/11447/ph-buffer-at-ph-6-80-7-20
@Perry and @Pharma are really knowledgeable and realistic people.
Pharma will tell you extra things that you never ask, but super useful. You simply missed the chance to learn the true ‘secrets’.You did it and you did it again. Thus, you will continue to miss the chance. Very likely they will not bother to engage in your future posts if you continue to be secretive. I say GOOD LUCK TO YOU! HAHAHAHAHAHAHA!
I could pretend to be a nice person and respond by presumptions. With vagueness, of course. As vague as somebody I recently responded to. LOL!
1) 0,15% low. Higher %.
2) Xanthan Gum. Suspend good. Texture bad. You choice.
3) HPMC no good. Viscosity reverse temperature.
4) You test flaw.
5) “…it does not separate at all. Only slight sedimentation”???? What you talking?!?!?!?! That 100% separate. Googal SEPARASHYUN TECHNIKZ.
It is separation even if you split the same water into two different containers. You split gasses that you see no visible difference is still separation. Slight or severe sedimentation is still separation. Engineers worked hard to create detection devices that detect the slightest separation of any stuff which the scamming human eye and the unreliable human brain fail to detect.
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Dear Sir Cst4Ms4Tmps4,
I am very sorry if my questions and the way I answered offended you. It never been my intention. And thank you also for pointing out my mistake. I am very new to cosmetic formulation field. Actually my field of study is Biology. I know that I am very stupid and having lack of knowledge in this field. I will try very hard to improve myself.
I also want to say sorry to everyone else @Perry @Pharma @GeorgeBenson. I am sincerely sorry. Please forgive me. -
@Research1 You don’t need to apologize. We are all here to learn and share knowledge
For better assistance, always share your formula because it’s very hard to give advice if we don’t know how your ingredients are interacting with each other.
Good luck!
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Dear @Research1,
Nothing to do with your background. Nothing to do with how stupid you are. Definitely not language barrier.
Your apology comes out as sarcasm. See? You are doing it again. You still do not list down your ingredients. You knowingly ignore again. You are doing it on purpose. You rather spend that time to apologise.
I think you are not taking your enquiry seriously. You do not need valid answers, perhaps. You are probably too lonely, hoping somebody to entertain your vagueness and ambiguity. National secret. Maybe world secret.
Thank you.
Yours sincerely,
Christopher
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