[Abdullah]

Fekher said:

@Abdullah according to your expertise what input will you suggest even more then ingredient or unlisted? 

Sorry i didn’t have experience in this category.

[Abdullah]

I don’t have explanation for it. A chemist here told me to do so, i did and got the results. I don’t remember it correctly but i think it didn’t work in anionic emulsion.

[Abdullah]

@PhilGeisis benzyl alcohol anti bacterial or anti fungal? 

[Abdullah]

PhilGeis said:

Here’s the link - https://www.jidonline.org/article/0022-202X(86)90008-4/pdf
I’d not get carried - no standard deviation in this or Fig 1.

It says This page does not exist.

[Abdullah]

PhilGeis said:

Wouldn’t the Na salt be more cooperative?

Generally it is. 

Only advantage of sa is you can use small amount to reduce pH too.

[Abdullah]

@vitalys thanks 
Is this photo from a book? 

[Abdullah]

Mikrokill COS will be good at pH ≤5. At pH 7 look for PhilGeis suggestion. 

[Abdullah]

It was for viscosity and stability. 

[Abdullah]

Fekher said:

@Abdullah welcome to curious chemists group ????????????, I have similar mentality wich makes a lot of fun but mind burns ????
  Just with your  SA experience you discovered very interesting solvent system 10% for 14% 

Yeah ????

[Abdullah]

I forgot. I used NACL too in cationic emulsion. It pased three months  puting bottle in window, hot in day and colder at night stability test and pased 3 cycle freeze Thaw cycle. I think this product is very much stable. maybe the combination makes it stable. 

[Abdullah]

It was just an experiment to see what happens ????. I was not going to use or sell that product. 

I love doing experiments and as I usually purchase ingredients in bulk, I don’t have problem doing a lot of experiments so i mix whatever ingredients i have in different ways that comes to my mind just to see what happens. Some times i get pretty good results but most of the time i learn what i should not do. 

[Abdullah]

Fekher said:

You are welcome @Abdullah just I want to know for that type of cream your emulsifier combination is only cationic surfactant + fatty alcohol?

Cationic surfactant+fa+ petrolatum+ glycerin+ preservative+ fragrance+ water. 
pH adjusted with lactic or citric acid.

No unnecessary or marketing ingredients ????

[Abdullah]

I once easily dissolved up to 14% salicylic acid in 10% surfactant solution. Product was clear. Didn’t add anymore to not waste the ingredients.

[Abdullah]

You need an antifungal too.

[Abdullah]

@vitalys what about Stratum Corneum? Does it have water? Because this is the outermost layer and what will be in contact with cosmetic products.

[Abdullah]

@chemicalmatt thanks

For me 1% SPDMA needed 5% lactic acid that supplier said is 80%. That is very big difference.

Does it mean this lactic acid is not really 80% and supplier is lying? 

Supplier is a wholesaler, not manufacturer and i purchase salicylic acid & citric acid from them too. They have good quality. 

Is there any way to check if this lactic solution really has 80% lactic acid or not? 

[Abdullah]

@ketchito thanks 
I use only 0.5% cationic surfactant+ fatty alcohol in emulsion. 
People who has used these cationic emulsions all liked it more than emulsions with these anionic & non-ionic surfactants (GMS, sodium stearoyl lactylate, polyglyceryl-4 laurate) stabilized with xanthan gum. Do you think 0.5% BTMS or BTMC will cause irritation?

For me cationic emulsion has a lot of advantages and most importantly somehow the final product costs less than emulsion with very inexpensive anionic & non-ionic emulsifiers mentioned above. 

[Abdullah]

Fekher said:

@Abdullah nice subject to treat and as short answer I guess it should be above 4.8
https://www.paulaschoice.com/expert-advice/skincare-advice/skin-care-myths/the-ultimate-guide-to-ph-and-your-skin.html

Thanks

[Abdullah]

Try 10:1 ratio.

[Abdullah]

How much is the profit margin? 

If the profit margin is too low, you will not make enough profit to make you motivated enough to sell more. 

[Abdullah]

@ketchito i use 80% lactic acid solution that has 80% lactic acid solids & 20% water. By solid i mean actual lactic acid. 

Do you also need 4.5% lactic acid 88% solution to neutralize 1% SPDMA to pH 4-4.5?

[Abdullah]

What percentage and ratio have you tried?

[Abdullah]

A chemist here once told me that skin and hair doesn’t have pH. The have isoelectric point.
Skin isoelectric point is ~4.8 
Hair isoelectric point is ~3.6

These papers all say skin pH is this and that. 

Maybe i haven’t understood it correctly so i am asking it once again. 

does skin have pH?

[Abdullah]

Does 10 ppm formaldehyde do any benefit if combined with phenoxyethanol in emulsion or CMI MI in cleansing product or this amount is useless as preservative?

[Abdullah]

PhilGeis said:

Sorry - my comment was confusing - parabens/EDTA WITH chloromethylisothiazolinone.
Parabens./EDTA alone is not - but good addition to chloromethyl isothiazolinone that is excellent vs bacteria, esp. Gram negatives.

Thanks a lot