Preservative Challenge Test
[Demo copy, to be revised] Inoculates the product with set organisms and tracks counts over 28 days to judge whether the preservative system protects it.
About this test
【Demo 文案，需調整】
防腐挑戰測試（PET）模擬產品在使用過程中被微生物污染的情況。實驗室將細菌、酵母菌與黴菌分別接種到產品中，在第 2、7、14、28 天計數，依 ISO 11930 的判定標準評估防腐效能。
適合新配方上市前、更換防腐劑或調整配方後進行。
Tests included
| Test | Method | Notes |
|---|---|---|
| Staphylococcus aureus | ISO 11930 | Bacteria |
| Pseudomonas aeruginosa | ISO 11930 | Bacteria |
| Escherichia coli | ISO 11930 | Bacteria |
| Candida albicans | ISO 11930 | Yeast |
| Aspergillus brasiliensis | ISO 11930 | Mold |
Related tests
Microbiological Testing[Demo copy, to be revised] Counts total viable microorganisms and screens for specified pathogens against cosmetic microbial limits.
Stability Testing[Demo copy, to be revised] Stores the product under heat, cold, cycling and light, then checks appearance and physical properties to estimate shelf life.
Composition Analysis[Demo copy, to be revised] Measures the content of specific ingredients or identifies unknown ones, for formula checks and restricted-substance testing.
Efficacy Testing[Demo copy, to be revised] Volunteers use the product while instruments measure the change, giving data behind moisturising, brightening or anti-wrinkle claims.