[Abdullah]

You have to rinse the skin if it contacted with any material even if it is not irritable.
Even if sodium lactate is irritant, that is at 100% pure material. At 5% it doesn’t have any irritation. 

[Abdullah]

I agree with @Graillotion. The pH of skin is 4.7 so you want to make high pH product if lower pH works better and is easier to preserve? 

About emulsifiers 

Sorbitan laurate, polyglyceryl-4 laurate, dilauryl citrate makea very low viscosity emulsion.

From this list i like ecomulse more than others. It is table, good skin feel and Avery economical ingredients. 
You can purchase the ingredients and combine at this ratio to make it even more economical. 

[Abdullah]

My biggest eye opener was that most of the ingredients we think as good is not good, and what we think as bad is not bad. 

[Abdullah]

@Perry ibi add cationic surfactant like BTMS to this, should i aim for ~1% total conditioning ingredients ( cationic surfactants+Amodimethicone) or 1% Amodimethicone and 1 or 2% cationic surfactants? 

[Abdullah]

@Bax65 thanks a lot

[Abdullah]

@Perry thanks a lot

[Abdullah]

@Bax65 thanks, very good information. 

At what temperature will it form criatals?
Will heating it reverse that? 
I am purchasing in 180kg drums not IBC. That is easier to use. 

And how about ALS 
Does it have powder form? 
Does liquid ALS also form crystals? 

[Abdullah]

Bax65 said:

@Abdullah - that’s an unavoidable issue linked to the manufacturing of the SLS granulate.
To make this easier to deal with a first pH adjustment should be done right at the beginning with only the SLS in water. Then you will have the lowest possible viscosity.
Once you have added a co-surfatant and/or any kind of thickener the foam will stay even longer.
Final pH adjustment can and probably still needs to be done when the formulation is completed.
Do you have the chance to apply vacuum and have a propeller stirrer running on top of the liquid? Idea is that the rotating propeller will destroy the rising foam when vacuum is applied.  

Unfortunately i don’t have vacuum available

[Abdullah]

@Bax65 thanks 
Is there a way to prevent SLS from too much foaming when reducing it’s pH? 
For 100g sample it produces like 500ml foam when i add citric acid to it. 

I don’t know how to handle that amount of foam in large batch. 

[Abdullah]

What is the problem? I couldn’t get it.

[Abdullah]

Your emulsifier also has a big role in your preservative effectiveness. 

Check this file.

[Abdullah]

@chemicalmatt you mean 50% APG which is 25% active surfactant? 

[Abdullah]

@jemolian yes it could be. 
But as sample surfactants like CAPB or SLS %30 are more simple than shampoo because they are only one surfactant and water and they also need Preservative. So it made me wonder if simple surfactant product is just this one surfactant in water or shampoo is also a simple surfactant product. 

[Abdullah]

https://www.makingcosmetics.com/Magnolia-Bark-Extract_p_534.html?locale=en

[Abdullah]

https://www.makingcosmetics.com/Magnolia-Bark-Extract_p_534.html?locale=en

[Abdullah]

When i googled about Magnolia Oficinalis to purchase some and use as preservative there was written preserved with phenoxyethanol. 

[Abdullah]

Pharma said:

1%/MW of Zn*MW of zinc PCA

MW of zinc PCA 321.59484000
MW of zinc 65.38

So 4.9188565310492g of zinc PCA gives us 1g zinc. 
Am i correct?

[Abdullah]

Have you tried Dimethicone/​Vinyl Dimethicone Crosspolymer?

[Abdullah]

PhilGeis said:

I’d not use with sorbate.  No purpose with two organic acids and the benzoic acid/surfactant phenomenon is not found with sorbic acid.

What is this benzoic acid/surfactant phenomenon? 

If i us sodium benzoate+phenoxyethanol +0.2 EDTA in shampoo, What ratio would give best results? 

[Abdullah]

Use phenoxyethanol instead of benzyl alcohol. It is milder, stronger for gram negative bacteria at will grow most in body wash and have less impact in viscosity than benzyl alcohol.

[Abdullah]

An aluminum tube also works for products that are air sensitive in an inexpensive Way.

[Abdullah]

ngarayeva001 said:

It won’t be stable even if you add antioxidants and keep it in freezer. Retinol is utterly unstable. I am talking about actual retinol not derivatives. Tretinoin is even worse.

What makes retinol unstable? 
Water

Air

Heat

Light 
Or something else? 

[Abdullah]

Write the percentage of each ingredient. And how much money you are ready to spend?

[Abdullah]

kconley said:

I’m new to all this and I have a lot to learn. The formula is a body wash and has Decyl Glucoside (and) Sodium Lauroyl Lactylate, and coca betaine as the surfactants. And it has Olive Oil PEG-7 Esters aka Olivem 300 as a solubilizer. I don’t have Olivem 300. I was wondering what I can use instead? I read I can use a Shea Water Soluble to replace the Olivem 300. It’s 3 percent of the formula. Can i use polysorbate 20? Can I make Shea Water Soluble with 50% water and 50% shea. Its a lot of work for 3% of the product.  but I don’t have an alternative on hand except poly 20. 

Use SLES/CAPB 3:1 and don’t to make a good shampoo. You can latter test all that other  stuff to make sure that they are not working. 

[Abdullah]

PhilGeis said:

Follow supplier’s choice for raw material storage.   What are the drums - are they lined?

The drums are also HDPE. 
What do you mean by lined?