Microbial challenge testing on W/o or w/silicone emulsion
Hi, I was told if an w/o emulsion formula with high hydrophobicity, it is not suitable to put on micro-challenge testing, due to the fact that bugs would not get the chance to go into the inner phase to contaminate the product. For example, 25% water,3.5% glycol, 1%NaCl in water phase, 30% pigments and powders, the rest is typical WE09 and EM90 and emollient. Any professional idea on it? Thanks.
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