[Chemist77]

Well I forgot that important aspect quite mistakenly that YES indeed it is needed to neutralize to pH 3.5-4.0 in case of SD and then at the end if process you can adjust the pH. Getting desired pH in the middle of process would be a bit cumbersome.

[Chemist77]

Citric acid is generally called pH adjuster among other things so I suppose logically the adjustment is best done at the end of the process.
I am sure other learned members can chip in too with a much better explanation.

[Chemist77]

@Perry oops my bad, in my case I go for midway suggested by supplier. Then on I decide to go up or down.

[Chemist77]

Yeah it has to be post neutralization.

[Chemist77]

@Bobzchemist You have given some absolutely great analysis there re the pigment wetting. 

[Chemist77]

My 2 cents worth is that you always start lower and go gradually upwards depending on the outcome of the first trial’s efficacy/performance. So I suppose @Perry wants to highlight that here. And then there are product literature to refer to for minimum and maximum dosage level. 

@Belassi That was absolutely a WOW suggestion that you chipped in. 

[Chemist77]

Sometimes the order of addition of PVP & Polquats to carbomer can make a difference. Are you adding before or after neutralization??

[Chemist77]

Polyvinyl Alcohol, I remember a product from Bayer but the cost and final result were both dampenets. And why would u replace PVA???

[Chemist77]

Thank you so much @David & @chemicalmatt

[Chemist77]

Did you think of AMP (Aminomethylpropanol)???

[Chemist77]

Great points @t4m456

[Chemist77]

I am using Dissolvine GL38, which grade are you using???

[Chemist77]

I am using Empipearl XA 200 & Empipearl XA 400 from Huntsman and no issues as such.

[Chemist77]

Great input @ Microformulation, though owing to cost restraints I use Carbomer 940 and it works great too with around 62% ethanol. Although had to add a little glycerol as plasticizer to avoid the balling of the polymer.

[Chemist77]

Gotta do it myself now!!!!! Can save some cost there I suppose.

[Chemist77]

@Belassi I would be suprised if glyceryl monostearate imparts pearlescence

[Chemist77]

Here you go
Gum Blend 1501. 60-70%
Cyclopentasiloxane. 20-30%
Phenyl trimethicone. 2-5%
Oil Blend. 5%

I suppose this should work, I have identical formula except that I don’t use blend. I use argan oil @ 5% and fragrance oil @ 0.3% level. Don’t forget to check the compatibility of your fragrance with silicone oils. And who suggested 20% phenyl trimethicone, just curious????

[Chemist77]

I have serum formulation with 5% Argan oiland the remaining is silicone oils and gum, have had no issues until now. Fragrance is there is well @ .3% level.

[Chemist77]

@Belassi is right, you can’t have CMEA just like that, a proper formula with proper procedure would be needed to have a wonderful creamy product. I use it and it’s a great addition to a formula if done properly.

[Chemist77]

@David Honestly thats a revelation for me as I never came across such kind of info that aeration is must for suspension. Still I would also try to dig out more on this as aeration is undesired in many clear products.

[Chemist77]

@Belassi Don’t forget to mention the persistant aeration that comes with handling of Aqua SF1.

[Chemist77]

Thanks a ton @DavidW, I would try to find it locally and see if it fits the bill in terms of cost. But a wonderful suggestion and I would bother you if I can’t find locally.

[Chemist77]

Bulletin 7 — Flow and Suspension Properties - Lubrizol

Try reading above and you will be clear on viscosity and suspension. I can’t copy paste the link but google it.

[Chemist77]

I have been using pumice but its more of grey and I don’t see too much white as such. We were doing what @Bobzchemist suggested but discontinued as the other abrasive was polyethylene. Still looking for something similar and which can effectively replace PE.

[Chemist77]

Guess she talks about sodium salt which has good solubility but not salicylic acid really.