Chemist77
Forum Replies Created
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Carbomer might not be a good choice when you have clay in formula (hoping its the same normal clay that is generally used for face mud masks), maybe you can incorporate magnesium aluminum silicate and see how it works out for you.
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Anything which disturbs the ‘lazy phase’ of micelles is definitely going to affect the viscosity.
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The kind of formula that you are using most definitely calls for any such mixer which minimizes or eliminates the possibility of air entrapment.
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In the first place I am a bit surprised to see the oil phase quantity and imagining how much they could have been helpful to build the viscosity. Secondly the bulks were most probably highly aerated at the time of filling and now when you received the bottles they are half empty once the air bubbles vanished. The ones you see now are some of those which could persist till the delivery. No one did the glass slide test to check the air entrapment??????
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Try the same with any other emollient oil and you would know if it is the process problem or the RM itself.
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@joseg There is a ferric chloride test for aspirin to detect the presence of salicylic acid, pure aspirin would return negative while presence of purple coloration would confirm the presence of salicylic acid. For your clay mask formula I am guessing you have some iron impurities which are giving this violet coloration with salicylic acid.
I pulled up this info from some interesting articles and I am sure with the iron impurities present it would be intrinsic to have a color drift. But I always suggest discretion and further reading and research.cheers -
What if you give a rapid cooling to the stick in the lab and see how it looks like, maybe then you would have your answer.
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@Microformulation Great link that.
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@Bati The use of these 2 items (which have to be used in conjunction and as communicated to me by Ajinomoto) would shoot up the formulation cost. For a high end product it can be absorbed but for medium to low-priced products I guess other thickeners would be more handy (of course after optimization).
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Check the microbial profile, it brings the pH down if there is any contamination. Or maybe the acid component/carbomer of your formula was not completely neutralized and now on standing the alkali has reacted with acidic components bringing the pH down.
I cant think of 3rd reason without knowing formula profile. -
@Bobz great input.
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But we never got to know the nature of your formula though.
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Check the data sheet from Sigma Aldrich, clearly mentions at RT and if done so, it has a shelf life of upto 5 years. So my guess is anything above RT would be extreme for it.
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@cossci21 Thanks for letting us all the know the real culprit.
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Could you work around your pH for the gums to be less thickened and eventually a thinner mist???????? Maybe the pH of your product is optimum for the gums to thicken and give viscosity????? Maybe a little play with the pH could help?????
Its a very blind shot and I might be completely off the line though. -
Guess beauty industry is ancillary to the fashion industry, no offence but cant imagine the models doing a ramp walk sans make up & perfumes.
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pH would decide the nature of Betaine (an amphoteric), and since the pH is below 7 generally for facial cleansers I suppose it would be more of a positive charged ion. But if the pH is above 7 then yes it would be anions.
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Not to forget the anti-microbial efficacy of the cationics.
Maybe this potion can be used @ 1% in other cationic and non-ionic emulsions as a preservative
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I think he is referring to the initial slimy feel of the polymer and hence the cleansing effect sets in after the intial slimy feel disappears. Better use a different thickener if you want to avoid that feel, I have experienced it with Aculyn 22 and Carbopol Aqua SF 1 both.
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guess she wants non ethoxylates
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Bentone Gel ISD V, Isododecane, Dry pigments, vegetable wax, a little non drying oil (literally very small quantity to cover up the drying effect of the solvents), optimize the formula and you have a smudge proof formula.
PS: I did a mascara with it (basic iron oxides only).
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@vjay The numerical value denotes the polymer chain length and it ranges from as low as 0.65 cSt to 20 million cSt (phew).
PS: 0.65 cSt has just two units of so it is a dimer and not a polymer like others.
Hope this helps. -
@Bobzchemist Bingo!!!!!!!!!
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@vjay Try lactic acid instead of citric acid, guess monoprotic acid would work much better compared to triprotic. Although I have had no such situation till now but you can do this trial and let us all know how it goes.
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If I have a similar problem and citric acid isnt working I would add a partially neutralized carbomer gel to adjust the viscosity and pH both at the same time. But this is my opinion, my perception about trouble shooting, every individual would have a different take on it.
cheers