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Phase inversion of w/o emulsion?
We are having some instability issues with a diaper rash cream (w/o emulsion, 13% zinc oxide). It is a new formula for us. The lab batches I’ve made and the pilot batch we did for stability turned out perfect and after 3 months 40C no separation or changes in the product, still looks great. However, we are having issues with the scaled up production batch. The first set of samples pulled to be tested looks great, however when they moved the product to the hopper to fill tubes, it fell apart. The first picture is how it initially looked, the second picture is what was poured from the tubes, third picture is product from the hopper. They pump they used to move it to the hopper was just air. Could too much shear be causing the emulsion to break or phase inversion possibly? Not familiar with w/o emulsion but want to try to prevent this from happening on our next batch if anyone has some input they could share. Thank you!
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