[Abdullah]

Of course some ionic surfactants help stability because of charge. 

Are you talking about Cetearyl alcohol + Ceteareth 20 or ceteareth 2 or so + Ceteareth 20 to go for HLB counting method? 

[Abdullah]

What is the pH of product, percentage of HYDROXYACETOPHENONE、GLYCERIN、1,2-HEXANEDIOL, METHYLPROPANEDIOL、BUTYLENE GLYCOL, names of those other extracts and package type?

If pH is ≤5 and these ingredient in high amount and good package that may be enough preservative. 

Wait for experts like PhilGeis to give you better comments. 

[Abdullah]

Paprik said:

1. Non-ionic helps with building viscosity and mildness to the product. Customers usually like thick product, they think it is a sign of well performing product. 
2. Definitely high HLB, it is for better wash off.

Thanks. That is good because i thought there is non-ionic surfactant is needed for stability purpose. 

[Abdullah]

@Bill_Toge thanks 

Should i use PEG-8 olive glycerides with deposition aid like cationic guar or if used alone can also improve skin feel.

By methocel, do you mean Hydroxypropyl Methylcellulose or something else? 
Can you write the inci name please.

[Abdullah]

@chemicalmatt thanks 

Does this redeposition happen during washing washing with hard water or rinsing with hard water? 

Water hardness here is around 700 TDS. During shampooing, 3g for men and 15g shampoo for women creates enough foam. 
What percentage of EDTA in shampoo enough for this purpose? 
I am using 0.1% tetrasodium EDTA currently. 

[Abdullah]

Perry said:

@Abdullah - Yes. I just don’t know what that would be.

Thanks

[Abdullah]

@chemicalmatt just to know, the molar ratio for high/low HLB surfactant should be between 1:1-1:6 to make LGN. How do you count the molecular weight of GMS when glyceryl mono stearate is 40% or 90% in GMS product? 

For example

GMS is 358.563 g/mol
GDS is 625.02 g/mol

GMS that we use is not 100% GMS. It has glyceryl distearate too.
If you use 1% GMS product that has 40% GMS in it, will you consider molecular weight of this 1% GMS for LGN
As 358.563 g/mol

As 500.512 g/mol which is sum of 40% mono & 60% di stearate
Or as 143.4252 g/mol which you count only 40% mono part and don’t count distearate at all?

[Abdullah]

ketchito said:

@Abdullah Most structured cosmetic emulsions now have a lamellar gel network. Unfortunately (because not everyone has access to the equipment) the only way to really know if you got one is through x-ray diffraction. 

@ketchito by equipments, do you mean equipments to make LGN or equipments to check if it is made?
If you mean equipments to make LGN, what are those equipments? 

[Abdullah]

@Pharma there are some informations that show adding fatty alcohol improves combing. 

Like this chart about Behenamidopropyl dimethylamine. 
It shows 1% BAPDMA+ 3% fatty alcohol has almost the same combing force reduction as 2% BAPDMA+ 2% fatty alcohol.
Any comments on this? 

[Abdullah]

@Perry is there any ratio glycerin/water above which we can feel heat or when the heat is more than 50% we will feel heat? 

[Abdullah]

Pharma said:

Yes.

Thanks

[Abdullah]

@Perrydo you mean applying glycerin without water makes skin warm? 

[Abdullah]

MariaGarcia said:

I never stop learning on this forum. What is the benefit of adding cationic substances to skin products? I was convinced that they were only used in hair products to combat frizz.

Come people likes the way they feel

[Abdullah]

Cafe33 said:

Are you open to changing your surfactant system? 

Also, Polyquat-39 can be an impressive addition in my experience. 

Yes i am always willing to change and improve.

[Abdullah]

ketchito said:

@Abdullah Usually, you don’t use a high quat load in skin products (yes, catonic surfactants are more irritating in leave on products, specially when applied on the skin), but a bit of Guar HPTC won’t hurt (usually, you feel a velvety dry fealing when skin is dry). Also, for skin cleansers I’d prefer a non-charged silicone (like Dimethicone). 

Thanks
Any preference about viscosity of dimethicone for skin?

[Abdullah]

ketchito said:

@Abdullah If the surfactant is affected by hard water, the loss in foam correlates with decreased solubility and hence, interfacial activity (and detergency).

Thanks a lot

[Abdullah]

zetein said:

It has to be higher than 7 and a couple of buffers are needed.

But why not just buy a bottle of calamine lotion？

At what pH is calamine stable?

[Abdullah]

Paprik said:

I am not sure at this input (1%), but zinc oxide self regulates to pH of around 7 (in SPF or balms products)

I guess you get a slight skin protective benefits as it covers the skin a bit, but I would not rely on it. 

Yes for SPF it should be around pH 7. But does it need to be at pH 7 for skin protection too? 

[Abdullah]

evchem2 said:

What phase are you adding the zinc oxide to- water or oil?  below pH 6 zinc oxide will start dissolving and you will have Zn ions in solution or new complexes which causes some formulation instability

I can use it in both phases. I just wanted that skin protection effect of it.

[Abdullah]

Dont waste your money by adding parabens in shampoo.

[Abdullah]

ketchito said:

@Abdullah There are actually many patents issued by P&G around the same SH backbone, with few changes. Try using Google patents, and write:  procter shampoo lamellar. You’ll see many entries.

Thanks

[Abdullah]

@ketchito Is that patented by p&g? 

If yes, do you know which patent it is so i can have a look. 

[Abdullah]

Add some gum Arabic

[Abdullah]

 Are you saying that the GMS SE and cetyl alcohol may be reducing the viscosity of this one emulsifier, but not the others?

Maybe. If you make a batch with only 202 then you can say for sure what was the problem. 

In LGNs only a specific ratio of surfactants give high viscosity as shown here. 

[Abdullah]

Perry said:

I mean that whenever you change any aspect of the composition of a surfactant system (e.g. concentration, surfactant type, etc), the viscosity response to salt addition will change.

Got it
Thanks