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@ketchito
in formulation i have mostly ester oil and some vegetable oil
triethylhexanoin- 27%
propylene glycol dicaprylate/caprate- 50%
triisostearine- 5%
Isododecane- 5%
sunflower oil- 1%
Polyglyceryl-2 caprate- 12%

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@Perry if silicone is not soluble then it won’t be a clear shampoo?
How can i get a clear shampoo without silicone?

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the pH I get at the end is the 8

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when I add the copolymer to anionic surfactant I get white precipitate. anybody encounter this as well.

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I found that SLS causes my copolymer to be runny,not thicken

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I did add more salt but the viscosity remains the same. Currently my shampoo is like water, I would like something more viscous than water

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@Taher can I know the viscosity of the shampoo?

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currently i am using polyglyceryl-4 caprate which i believed is categories as naturally derived. please correct me if i am wrong

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We are looking for something that is naturally derived

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The problem is there are request for natural and PEG free

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you are planning to make o/w or w/o lotion?

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I would like to suggest Propylene glycol diheptanoate (Trade name: Jolee 7202) from Oleon. It gives a nice powdery feel at the end. The best part is it is a natural molecule.

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You should first dissolve the glutamides in an oil. Becareful with the oil you choose it should be stable because glutamides dissolve at a very high temperature (120 deg C). Once it is dissolve mix with other ingredient at about 80 deg C while stirring. Then pour it into the lipstick mold. Glutamide thickens the oil very quickly so you should complete the process fast before it hardens

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i think you can try using polyglycerol esters which have high HLB

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I will try formulating with these ingredients

thanks for the input

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@bobzchemist I have difficulties achieving my SPF for formulations with low viscosity.Therefore I thought of adding and ingredient with thixotropy behaviour in order to achieve the SPF but at the same time exhibits easy spreading and nice feel.

It can be shear-thinning with no reversal.

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@belassi thank for your reply

is there any other alcohol that gives this property

such as behenyl alcohol

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@bobzchemist you suggest to investigate if the crystals of cetyl alcohol at RT will disrupt the lamellar layer form by lecithin. Can i know how can we do this? Through TEM?

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@nedazirakzadeh how do i define the incompatibilities with my formula

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@Bill_Toge

Thank you for your opinion

Sorry I made a mistake on the previous statement

Oil phase + water + emulsifier :SPF=7 

Oil phase + emulsifier :SPF 30 (like calculated)

I will try to change the emulsifer used. Currently I am using an anionic emulsifier

The reason I am suspecting hydrolysis because ethylhexyl methoxycinnamete (OMC) has an ester bond and one of my emulsifier has an acid value of 30.

I do not expect film formation to be the problem because my emulsion is only applied on PMMA plates and did not undergo any irradiation. The SPF measured is the actual SPF before irradiation and water resistant test.

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I checked the SPF on the following combination

Oil phase + water + emulsifier :SPF=30 (like calculated)

Oil phase + emulsifier :SPF 30 (like calculated)

With this results can i say hydrolysis occur in the formulation?

Please advise

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However I did the SPF test on the oil phase alone and got the expected SPF value (SPF 30)

Oil Phase

Avobenzone- 5%

Octoocrylene - 4%

Ethylhexyl Methoxycinnamate- 7.5%

Benzophenone-3 - 1%

Ethylhexyl Salicylate - 5%

Uvinul A Plus - 2%

Triethylhexanoin -10%

It is when I make it into an emulsion my SPF value runs very far from the actual calculated SPF. Could this still be due to photostability?

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by standard stability test you are referring to 5C, room temperature and 45C?

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@makingskincare thank you for the information.

I would like to know if I am only using 1 type of emulsifier (either w/o or o/w emulsifier) will the phase transformation still takes place? If this still takes place then in a normal o/w emulsion I assume the water still evaporate right?

On the other hand, for a w/o emulsion the water is in the inner phase can it be evaporated easily?

I hope you can help me in this

Thank you

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we use refractometer to check on the refractive index. by this we know the properties of emollients such as which give a more glossy or shinning look.

another usage of refractometer is also to study the stability of an isotropic emulsion.