Comments on: Cosmetic Stability Test – Freeze Thaw Cycles http://chemistscorner.com/cosmetic-stability-test-freeze-thaw-cycles/ Cosmetic science resource site where you can learn all about cosmetic chemistry Thu, 09 Feb 2012 21:38:22 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: karuna ghodkir http://chemistscorner.com/cosmetic-stability-test-freeze-thaw-cycles/#comment-5795 karuna ghodkir Wed, 30 Nov 2011 19:30:41 +0000 http://chemistscorner.com/?p=281#comment-5795 Sir, I am doing my thesis work on anticellulite cream for my master degree course in cosmetic technology.I want to know abt stability of my o/w creame.the base formula should be stable but when I added my active drug ingredient in it the formulation shows seperation after 3-4 days.plz can you help me?what can i do to avoid this problem?Plz Sir, I am doing my thesis work on anticellulite cream for my master degree course in cosmetic technology.I want to know abt stability of my o/w creame.the base formula should be stable but when I added my active drug ingredient in it the formulation shows seperation after 3-4 days.plz can you help me?what can i do to avoid this problem?Plz

]]> By: Perry http://chemistscorner.com/cosmetic-stability-test-freeze-thaw-cycles/#comment-4160 Perry Tue, 27 Sep 2011 16:15:39 +0000 http://chemistscorner.com/?p=281#comment-4160 It's difficult to guess without knowing the specific surfactants you're talking about or what other ingredients are in there. But a separation like that sounds like a solubility issue. It could be related to the fragrance you are using, some cationic species in the formula or the concentrations of the surfactants. You could probably solve it by changing some of those factors. It’s difficult to guess without knowing the specific surfactants you’re talking about or what other ingredients are in there. But a separation like that sounds like a solubility issue. It could be related to the fragrance you are using, some cationic species in the formula or the concentrations of the surfactants. You could probably solve it by changing some of those factors.

]]> By: Mit Bhandari http://chemistscorner.com/cosmetic-stability-test-freeze-thaw-cycles/#comment-4159 Mit Bhandari Tue, 27 Sep 2011 16:03:56 +0000 http://chemistscorner.com/?p=281#comment-4159 Hi, I am not a cosmetic chemist but household cleaners chemist, hope you would still reply me. Most of our products are liquid (water thin). Issues I am facing: 1) After a F/T cycle, darker color on the bottom and light to clear color on the top. Initially, I though it my surfactants are falling out - so added some hydrotop (SXS) but didn't help. Any feed back would be helpful. Just an FYI: Particular product is All Purpose Cleaner. I am using 2 surfactants. 1 Anionic and 1 Non-ionic surfactants. Not sure if that will help you, but both phrases have different specific gravity. Any help would be greatly appreciated. Thanks, Mit Hi,

I am not a cosmetic chemist but household cleaners chemist, hope you would still reply me.

Most of our products are liquid (water thin).

Issues I am facing:
1) After a F/T cycle, darker color on the bottom and light to clear color on the top. Initially, I though it my surfactants are falling out – so added some hydrotop (SXS) but didn’t help. Any feed back would be helpful. Just an FYI: Particular product is All Purpose Cleaner. I am using 2 surfactants. 1 Anionic and 1 Non-ionic surfactants.

Not sure if that will help you, but both phrases have different specific gravity.

Any help would be greatly appreciated.

Thanks,
Mit

]]> By: Perry http://chemistscorner.com/cosmetic-stability-test-freeze-thaw-cycles/#comment-2976 Perry Tue, 21 Jun 2011 12:12:00 +0000 http://chemistscorner.com/?p=281#comment-2976 It sounds like you have identified a stability problem. Without seeing the formula it is difficult for us to give any specific answers. Slight pH changes are not unexpected and do not necessarily mean there is a problem with stability. It sounds like you have identified a stability problem. Without seeing the formula it is difficult for us to give any specific answers. Slight pH changes are not unexpected and do not necessarily mean there is a problem with stability.

]]> By: pia http://chemistscorner.com/cosmetic-stability-test-freeze-thaw-cycles/#comment-2969 pia Mon, 20 Jun 2011 18:24:39 +0000 http://chemistscorner.com/?p=281#comment-2969 hi, i have started a freeze thaw test cycles on a body spray product and in the first cycle i obtained precipitation in the sample, a darkened colour and a slight increase in the pH. so, our first thoughts were that it is a solubility issue of a phase into another which had affected the pH thus the colour.. i am continuing the test cycles to see if there will be any more changes. do uou have any suggestions for me? Thans hi, i have started a freeze thaw test cycles on a body spray product and in the first cycle i obtained precipitation in the sample, a darkened colour and a slight increase in the pH.
so, our first thoughts were that it is a solubility issue of a phase into another which had affected the pH thus the colour..
i am continuing the test cycles to see if there will be any more changes.
do uou have any suggestions for me?
Thans

]]> By: Perry http://chemistscorner.com/cosmetic-stability-test-freeze-thaw-cycles/#comment-2850 Perry Wed, 25 May 2011 11:10:15 +0000 http://chemistscorner.com/?p=281#comment-2850 While it doesn't give completely accurate results, we just used a standard pH meter to measure pH of water-in-oil emulsions. This would only help identify gross changes however and wasn't particularly useful. Why do you want to measure the pH of a system like this? While it doesn’t give completely accurate results, we just used a standard pH meter to measure pH of water-in-oil emulsions. This would only help identify gross changes however and wasn’t particularly useful. Why do you want to measure the pH of a system like this?

]]> By: cris baysauli http://chemistscorner.com/cosmetic-stability-test-freeze-thaw-cycles/#comment-2836 cris baysauli Tue, 24 May 2011 00:27:32 +0000 http://chemistscorner.com/?p=281#comment-2836 How about water-in-oil emulsions sir, is there another way to measure pH? How about water-in-oil emulsions sir, is there another way to measure pH?

]]> By: Shalini http://chemistscorner.com/cosmetic-stability-test-freeze-thaw-cycles/#comment-2821 Shalini Sun, 22 May 2011 12:21:28 +0000 http://chemistscorner.com/?p=281#comment-2821 this corner really rocks! a lot of infos are in here...congratulations! this corner really rocks! a lot of infos are in here…congratulations!

]]> By: chaitanya http://chemistscorner.com/cosmetic-stability-test-freeze-thaw-cycles/#comment-2375 chaitanya Fri, 04 Feb 2011 04:18:46 +0000 http://chemistscorner.com/?p=281#comment-2375 The was really served my purpose, thank you.. sir can you please give the references for this information. thanks in advance..: The was really served my purpose, thank you..

sir can you please give the references for this information.
thanks in advance..:

]]> By: Perry http://chemistscorner.com/cosmetic-stability-test-freeze-thaw-cycles/#comment-1804 Perry Thu, 14 Oct 2010 02:44:27 +0000 http://chemistscorner.com/?p=281#comment-1804 As long as it is a oil in water emulsion, you can use a pH meter. As long as it is a oil in water emulsion, you can use a pH meter.

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