[Abdullah]

zetein said:

@chemicalmatt Why pearlizers don’t function as emollient and re-fatting agent, like other fatty acid esters do, in cleansing products ?

They do indeed. Have you tried them?

[Abdullah]

@chemicalmatt does hydrotrope mean solubilizer for silicone? 

[Abdullah]

chemicalmatt said:

That is the standard commercial concentration, determined many years ago by partial pressure equilibria calculations of volatiles. Same holds true with standard ammonia concentration (26Be if I recall?), etc., etc. 

Thanks

[Abdullah]

Perry said:

@Abdullah - It’s 0.6% in the EU and 0.3% in Japan.
I said 1% because DMDM Hydantoin is sold as a 55% solution.  So, if you use 1% of that in a formula, you would be at 0.55%.

Until now i was thinking upper limit is 0.6% solution, not the actual product. 

Thanks for the information. 

[Abdullah]

vitalys said:

@Abdullah The Stratum Corneum is a pretty strong shield against sunbeams. When SC gets damaged or altered with any chemical or mechanical agent the shield becomes weak or thin, which makes lively skin cells vulnerable to solar radiation. The latter induces inflammatory reactions as well as the alterations from the damaging factors (e.g. acid peelings). 

Abdullah said:

And is this sensitivity only when AHA is on top of skin or even after some time when it is rinsed off? 

The hypersensitivity will last until the skin barriers are completely restored and inflammation is eliminated. 

Thanks

[Abdullah]

Perry said:

Well, that depends on what else is in your formula. But DMDM is safe for use up to 1%.

Of course, you have to do a preservative efficacy test to determine whether your formula is safe when using only DMDM Hydantoin. 

@p@Perry ca i ask is the upper limit of DMDM hydantoin 1% or 0.6%?

[Abdullah]

@Syl thanks a lot

[Abdullah]

@ozgirl no i didn’t read the MSDS of formalin because our local suppliers don’t provide those materials. 

Thanks for the file. 

[Abdullah]

@Syl can’t open the links. Says blocked. 

Can you send the PDF file if you can open it. 

[Abdullah]

@Paprik thanks for the file.

This part was interesting. 
In the Federal Republic of Germany, on the basis of information available to the BGVV it has been recommended that glycolic acid may be used at a level of up to 4% and a pH ≥ 3.8 and lactic acid up to a maximum level of 2.5% and a pH ≥ 5.

isnt lactic acid more gentle than glycolic acid?

[Abdullah]

@vitalys which stage makes the skin sensitive to sun?

And is this sensitivity only when AHA is on top of skin or even after some time when it is rinsed off? 

[Abdullah]

@Pharma just to know, what would be the pH if we neutralize 2% salicylic acid with 0.56% sodium hydroxide?

The one i made which had 0.1% tetrasodium EDTA too had pH of ~4.8 without any pH adjustment.

Is sodium hydroxide flacks always 100% sodium hydroxide? 

[Abdullah]

zetein said:

Does it smell like garlic?

No

[Abdullah]

ketchito said:

@Roopal I’d choose a cationic guar for clear systems, like N-Hance CCG 45. You could also make a sample without cationic guar, to rule out any other possible source of turbidity. 

Interestingly cationic guar for clear system is 3 times more expensive than regular cationic guar.

[Abdullah]

Perry said:

Yeah, this isn’t a properly written List of Ingredients. Water is obviously the most abundant material and should be listed first. I suspect someone who knows little about labeling rules put together the list from their formula. It’s highly unlikely they would be using 1.5% of this preservative. Especially when 0.02% is usually enough.

Thanks

[Abdullah]

ketchito said:

@Abdullah I believe they meant the mixture of MCI/MIT has a concentration of 1.5% (which is the usual amount of that mixture in commercial solutions). It’s a bit odd to put it that way though, but local authorities can sometimes require a bit odd things.

Yeah. It may be so because this is a Big brand here and produces even there bottle and caps by themselves. 

[Abdullah]

@Pharma then what was the problem with my Formulation that salicylic acid came out of solution?

I added 
2% salicylic 
5.8% sodium hydroxide(10% in water)
0.1% tetrasodium EDTA 
1% phenoxyethanol+ caprylyl Glycol
Hot water

Batch size 500g

The process was weighting and adding everything and then adding hot water. Then mixing with stick blender for 2-3 minutes.

When it was hot everything was solubilized.

pH was about 4.8.

Then i added some citric acid (50% solution) to bring the pH down to 3 but it directly produced white salt on top of solution. was this salicylic acid coming out of solution?
This is the photo

I then made another batch without adding citric acid. At first when it was hot everything was solubilized. Ofter one night crystals had precipitated in botom of bottles. Was that salicylic acid?

The main question is why salicylic acid comes out of solution?

And what confuses me is in the past i had made neutralized salicylic acids this way without any problem. Unfortunately i couldn’t find where had i written those formulas. But i remember i was using salicylic acid: sodium hydroxide at 1:0.29 ratio. But it is not working now ????

[Abdullah]

jemolian said:

Here

Thanks

[Abdullah]

@jemolian I can’t open the documents from Ulprospector. If you can, can you upload the document here. 

[Abdullah]

@jemolian where is the brochure? I cant find it in this link.

Do you have it? 

[Abdullah]

You didn’t say what is your pH.

[Abdullah]

PhilGeis said:

sensitization.

Thanks

[Abdullah]

@Sylthis this claim is very popular in Asia. 

[Abdullah]

Bill_Toge said:

it releases formaldehyde when microbes attempt to ingest it, in the same way that parabens release alcohols when microbes attempt to ingest them

it also starts to release formaldehyde in alkaline conditions, or when exposed to temperatures over around 50-60 °C

Thanks

[Abdullah]

PhilGeis said:

prob just the formaldehyde

Thanks