Thickening a Sal Acid Face Wash

DavidW

I am looking for idea to thicken a salicylic acid 5% face wash. I am using sodium citrate in the formula at about 2% so salt will not thicken. The base is:

Water 40.700% AOS 40 20.000% CABLC 26.000%

I used Sepigel which worked nice in the lab. Not so much in production and the sample fell apart after 4 months. Any suggestions?

Thanks

Robert Zonis

I'm thinking you need something that functions only as a thickener, so the sal acid can't mess it up:

Fumed silica

Laponite

Kelzan ASX-T

However, something that works fine in the lab, but fails in production should be raising GIANT red flags all over the place. You need to figure out what went wrong in the translation between lab batch and production batch, or you have NO assurance that anything you make in the lab will EVER be ok in production. (This is why most chemists insist on pilot batches - it's not just so that we can have someone else to blame when something goes wrong :) )

DavidW

Thanks Robert. I have also tried Natrosol 250 HHR. Separated after a day or 2.

Laponite is very interesting material. I have used it before and found it to not work consistently the same in a given formula.

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