[mmarr]

thanks everyone, after few days, the viscosity increase back. i think it really need some time to settle down and achieve the viscosity

[mmarr]

Thanks @graillotion for your insight. I do use PE 9010 as for my preservative system, but some said its hard to preserve serum alone. so just need some ideas good preservative to try on my formula 😀

[mmarr]

yes correct, we also sulphate free since this products for babies. we currently using lauryl betaine, Disodium Lauryl Sulfosuccinate, lauryl glucoside and also sodium cocoyl methyl taurate for the sufractants.

[mmarr]

I got it. Thanks a lot for helping

[mmarr]

oh i see, if you dont mind, may i know what is your corrective action to overcome this kind of problems?

[mmarr]

ohh i see, So, what do you think everytime we open the batch raw material, there are some issue with the viscosity? do we really need to broaden our viscosity range or do we need to adjust our formulation everytime to fit the viscosity?

[mmarr]

different range in viscosity around 15k, last month we made 16 batches, the results quite consistent for the viscosity. fyi, we standardized the temperature and viscosity spindle. for this month, we open new batch emulsifier, then we noticed the viscosity quite low from last month. we are using natural emulsifier, so not sure if this really affect the visco.

[mmarr]

ohh thank you, btw is glycol stearate can cause instability? as far as i know, it usually can act as co emulsifier.

[mmarr]

we are trying to figure out the root of the problem. is it really the formulation unstable or processing. cause when we did in small batches in lab, apparently, no issue.

[mmarr]

there are only water soluble active, they only thing i susppected is either the process or do you think fragrance can cause instability? we put 0.1% only. we do have carbomer as thickener and EGMS as pearlizer/co emulsifier.

[mmarr]

we suspected it during processing. maybe not enough time for thickener and active bind together. not sure if it right

[mmarr]

okay, will check on it. thanks @mikethair

[mmarr]

no, not yet coz in the lab, there is no separation. Can it because of the processing issue?

[mmarr]

we do actually tried to test the visco using same temperature. still a lot of different.

[mmarr]

do u mean that the sequences also play a role for the visco? btw, im using flakes version for peg-150

[mmarr]

i see, thanks a lot for the help 🙂

[mmarr]

sorry, if you dont mind, can u explain how to do coacervate test?

[mmarr]

aqua- q.s

edta-0.1

glycerin-1

peg-150 -0.5

carbomer-0.3

glyceryl distearate(pearlizing agent)-0.5

lauryl betaine-8

lauryl glucoside-4

sodium cocoyl methyl taurate-4

sodium cocoyl isethionate-4

dimethiconol & TEA-3

PQ10-0.3

Preservative

[mmarr]

this one actually mixed solution with dimethiconol. I used BRB 1018.

[mmarr]

oh i see, so, means that its not really help for rinse off formulation. thank you for the response

[mmarr]

because i think percentage of olivem 100 i out in the formulation not enough, and adding peg-100 stearate to increase stabilization and also trying to reduce cost.

[mmarr]

coz actually, i can get nice emulsion when combining this two. no issue so far with separation, just the viscosity issue

[mmarr]

can i ask details differences between ethoxylated and non-ethoxylated?

[mmarr]

but olivem 1000 and peg-100 stearate & glyceryl stearate both are ethoxylated/non-ionic emulsifier right, should be compatible

[mmarr]

have you try using same formulation using CAPB and one more replace with lauryl betaine? I had tried several time, the result still shown that using CAPB the viscosity higher compared to lauryl betaine.