Stability testing variants: when one test can support several shades or scents, how to pick the worst case and what to document for your safety assessor.
Read more →Airless packaging stability: what to check beyond the formula, from dose per stroke and leakage to clogging, weight loss and seal interaction.
Read more →Cosmetic viscosity stability: why thickness changes in storage, how viscosity is measured and how to set a justified range for your stability test.
Read more →Cosmetic transport stability test: what heat, cold, vibration and drops do to your product and pack, which tests simulate shipping and how to document it.
Read more →pH testing of cosmetics during stability studies: why pH drift matters for preservatives, actives and texture, and how to read the data.
Read more →Stability test protocol for cosmetics: samples, storage conditions, time points, parameters and acceptance criteria, with a worked example.
Read more →Cosmetics expiry date rules in the EU: when a best-before date is mandatory, the 30-month rule, how to write the date and when a PAO applies.
Read more →Centrifuge test for cosmetics: what it reveals about emulsion stability, typical conditions, why ร g beats rpm and what the test cannot prove.
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A challenge test is required for every cosmetic product except microbiologically low-risk ones, which are:
A challenge test is required for every cosmetic product except microbiologically low-risk ones, which are:
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